Full opinion text
SACK, Circuit Judge: ■ “Water, water, everywhere / Nor any drop to drink.” Because New York City cannot tap the rivers, bays, and ocean that inhabit, surround, or, on occasion, inundate it to slake the thirst of its many millions of residents, it must instead draw water primarily from remote areas north of the City, mainly the Catskill Mountain/Delaware River watershed west of the Hudson River, and the Croton Watershed east of the Hudson River and closer to New York City. Water is drawn from the Schoharie Reservoir through the eighteen-mile-long Shandaken Tunnel into the Esopus Creek. The Creek’s water, in turn, flows into another reservoir, then through an aqueduct, and then through several more reservoirs and tunnels alongside the Hudson River, having crossed the River to its Eastern shore some 50 miles north of New York City. Eventually, it arrives at its final destination: the many taps, faucets, and the like within the City’s five boroughs. The movement of water from the Scho-harie Reservoir through the Shandaken Tunnel into the Esopus Creek is what is known as a “water transfer,” an activity that conveys or connects waters of the United States without subjecting those waters to any intervening industrial, municipal, or commercial use. Water transfers are an integral part of America’s water-supply infrastructure, of which the Scho-harie Reservoir system is but a very small part. Each year, thousands of water transfers are employed in the course of bringing water to homes, farms, and factories not only in the occasionally rain-soaked Eastern, Southern, and Middle- and North-Western portions of the country, but also in the arid West (including large portions of the Southwest). Usable bodies of water in the West tend to be scarce, and most precipitation there falls as snow, often in sparsely populated areas at considerable distance from their water authorities’ urban and agricultural clientele. Historically, the United States Environmental Protection Agency (the “EPA”) has taken a hands-off approach to water transfers, choosing not to subject them to the requirements of the National Pollutant Discharge Elimination System (“NPDES”) permitting program established by the Clean Water Act in 1972. Some have criticized the EPA for this approach. They argue that like ballast water in ships, water transfers can move harmful pollutants from one body of water to another, potentially putting local ecosystems, economies, and public health at risk. While acknowledging these concerns, the EPA has held fast to its position. Indeed, following many lawsuits seeking to establish whether NPDES permits are required for water transfers, the EPA formalized its stance in 2008—more than three decades after the passage of the Clean Water Act—in a rule known as the “Water Transfers Rule.” Shortly thereafter, several environmentalist organizations and state, provincial, and tribal governments challenged the Rule by bringing suit against the EPA and its Administrator in the United States District Court for the Southern District of New York. After many entities—governmental, tribal, and private—intervened on either side of the case, the district court (Kenneth M. Karas, Judge) granted summary judgment for the plaintiffs, vacating the Rule and remanding the matter to the EPA. In a thorough, closely reasoned, and detailed opinion, the district court concluded that although Chevron deference is applicable and requires the courts to defer to the EPA and uphold the Rule if it is reasonable, the Rule represented an unreasonable interpretation of the Clean Water Act, and was therefore invalid under the deferential two-step framework for judicial review established in Chevron, U.S.A., Inc. v. Natural Resources Defense Council, Inc., 467 U.S. 837, 104 S.Ct. 2778, 81 L.Ed.2d 694 (1984). The court held that the Rule was contrary to the requirements established by the Act. The Federal Government and the inter-venor-defendants timely appealed. Despite the district court’s herculean efforts and its careful and exhaustive explanation for the result it reached, we now reverse for the reasons set forth below. At step one of the Chevron analysis, we conclude—as did the district court—that the Clean Water Act does not speak directly to the precise question of whether NPDES permits are required for water transfers, and that it is therefore necessary to proceed to Chevron’s second step. At step two of the Chevron analysis, we conclude—contrary to the district court— that the Water Transfers Rule’s interpretation of the Clean Water Act is reasonable. We view the EPA’s promulgation of the Water Transfers Rule here as precisely the sort of policymaking decision that the Supreme Court designed the Chevron framework to insulate from judicial second- (or third-) guessing. It may well be that, as the plaintiffs argue, the Water Transfers Rule’s interpretation of the Clean Water Act is not the interpretation best designed to achieve the Act’s overall goal of restoring and protecting the quality of the nation’s waters. But it is nonetheless an interpretation supported by valid considerations: The Act does not require that water quality be improved whatever the cost or means, and the Rule preserves state authority over many aspects of water regulation, gives regulators flexibility to balance the need to improve water quality with the potentially high costs of compliance with an NPDES permitting program, and allows for several alternative means for regulating water transfers. While we might prefer an interpretation more consistent with what appear to us to be the most prominent goals of the Clean Water Act, Chevron tells us that so long as the agency’s statutory interpretation is reasonable, what we might prefer is irrelevant. BACKGROUND The Clean Water Act and the National Pollutant Discharge Elimination System (“NPDES”) Permitting Program In 1972, following several events such as the 1969 “burning” of the' Cuyahoga River in Cleveland, Ohio that increased national concern about pollution of our nation’s waters, Congress enacted the Federal Water Pollution Control Act (“FWPCA”) Amendments of 1972, 86 Stat. 816, as amended, 88 U.S.C. § 1251 ei seq., commonly known as the Clean Water Act (sometimes hereinafter the “Act” or the “CWA”). Congress’s principal objective in passing the Act was “to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters.” 33 U.S.C. § 1251(a). Congress also envisioned that the Act’s passage would enable “the discharge of pollutants into the navigable waters [to] be eliminated by 1985.” Id. § 1251(a)(1). Although time has proven this projection to have been over-optimistic at best, it is our understanding that the Act has succeeded to a significant degree in cleaning up our nation’s waters. The Act “prohibits ‘the discharge of any pollutant by any person’ unless done in compliance with some provision of the Act.” S. Fla. Water Mgmt. Dist. v. Miccosukee Tribe, 541 U.S. 95, 102, 124 S.Ct. 1537, 158 L.Ed.2d 264 (“Miccosukee”) (quoting 33 U.S.C. § 1311(a)). The statute defines the discharge of a pollutant as “any addition of any pollutant to navigable waters from any point source,” 33 U.S.C. § 1362(12)(A), where “navigable waters” means “the waters of the United States, including the territorial seas,” id. § 1362(7). The principal provision under which such a discharge may be allowed is Section 402, which establishes the “National Pollutant Discharge Elimination System” (“NPDES”) permitting program. 33 U.S.C. § 1342. With narrow exceptions not relevant here, a party must acquire an NPDES permit in order to discharge a specified amount of a specified pollutant. See id.; Miccosukee, 541 U.S. at 102, 124 S.Ct. 1537. Thus, without an NPDES permit, it is unlawful for a party to discharge a pollutant into the nation’s navigable waters. “[B]y setting forth technology-based effluent limitations and, in certain cases, additional water quality based effluent limitations[, ]the NPDES permit ‘defines, and facilitates compliance with, and enforcement of, a preponderance of a discharger’s obligations under the [Act].’ ” Waterkeeper Alliance, Inc. v. EPA, 399 F.3d 486, 492 (2d Cir. 2005) (third brackets in original) (quoting EPA v. California ex rel. State Water Res. Control Bd., 426 U.S. 200, 205, 96 S.Ct. 2022, 48 L.Ed.2d 578 (1976)). Noncompliance with an NPDES permit’s conditions is a violation of the Clean Water Act. 33 U.S.C. § 1342(h). Once an NPDES permit has been issued, the EPA, states, and citizens can bring suit in federal court to enforce it. See id. §§ 1319(a)(3), 1365(a). The Act envisions “cooperative federalism” in the management of the nation’s water resources. See, e.g., New York v. United States, 505 U.S. 144, 167, 112 S.Ct. 2408, 120 L.Ed.2d 120 (1992) (referring to the Act as an example of “cooperative federalism”); Arkansas v. Oklahoma, 503 U.S. 91, 101, 112 S.Ct. 1046, 117 L.Ed.2d 239 (1992) (the Act “anticipates a partnership between the States and the Federal Government”). Reflecting that approach, states typically control the NPDES permitting programs as they apply to waters within their borders, subject to EPA approval. See 33 U.S.C. §§ 1314(f)(2), 1342(b)-(c). The Act also preserves states’ “primary responsibilities and rights” to abate pollution, id. § 1251(b), including their traditional prerogatives to “plan the development and use (including restoration, preservation, and enhancement) of ... water resources,” id. and to “allocate quantities of water within [their] jurisdiction,” id. § 1251(g), subject to the federal floor, on environmental protection set by the Act and regulations promulgated thereunder by the EPA, see Nat. Res. Def. Council v. EPA, 808 F.3d 556, 580 (2d Cir. 2015). Water Transfers and the Water Transfers Rule According to EPA regulations, a “water transfer” is “an activity that conveys or connects waters of the United States without subjecting the. transferred water to intervening industrial, municipal, or commercial use.” 40 C.F.R. § 122.3(i). Water transfers take a variety of forms. A transfer may be accomplished, for example, through artificial tunnels and channels, or natural streams and water bodies; 'and through active pumping or passive direction. There are thousands of water transfers currently in place in the United States, including at least sixteen major diversion projects west of the Mississippi River. Many of the largest U.S. cities draw on water transfers to bring drinkable water to their residents. The City of New York’s “water supply system ... relies on transfers of water among its [nineteen] collecting reservoirs. The City provides approximately 1.2 billion gallons of ... water a day to nine million people—nearly half of the population of New York State.” Letter Dated August 7, 2006, from Mark D. Buffer, General Counsel, City of New York Department of Environmental Protection to EPA, at 1, J.A. at 331. The parties and amici tell us that water transfers are of special significance in the Western United States. Because much precipitation in the West falls as snow, water authorities there must capture water when and where the snow falls and melts, typically in remote and sparsely populated areas, and then transport it to agricultural and urban sites where it is most needed. See Western States Br. 1-2; see also State of California Amicus Br. 16 n.5. Colorado, for example, engages in over forty interbasin diversions in order to serve the State’s water needs. See Letter Dated July 17, 2006, from Brian N. Nazar-enus, Chair, Colorado Water Quality Control Commission, to Water Docket, EPA, at 1, J.A. at 320. California uses the “California State Water Project,” a complex water delivery system based on interbasin transfers from Northern California to Southern California, to serve the water needs of 25 million of its 37 million residents. See State of California Amicus Br. 3-10. Water transfers are also obviously crucial to agriculture, conveying water to enormously' important farmihg regions such as the Central and Imperial Valleys of California, Weld and Larimer Counties in Colorado, the Snake River Valley of Idaho, and the Yakima Valley of Washington. See Water Districts Br. 16-19. At the same time, though, water transfers, like ballast water in ships, see generally Nat. Res. Def, Council, 808 F.3d at 561-62, can move pollutants from one body of water to another, potentially endangering ecosystems, portions of the economy, and public health near the receiving water body—and possibly beyond. Despite these risks, for many years the EPA has taken a passive approach to regulating water transfers, effectively exempting them from the NPDES permitting system. The States have also generally adopted a hands-off policy. During the 1990s and 2000s, prior to its codification in the Water Transfers Rule, the EPA’s position was challenged by, among others, environmentalist groups, which filed several successful lawsuits asserting that NPDES permits were required for some specified water transfers. See, e.g., Catskill Mountains Chapter of Trout Unlimited, Inc. v. City of New York, 461 F.3d 77 (2d Cir. 2006) (“Catskill IF), cert. denied, 549 U.S. 1252, 127 S.Ct. 1373, 167 L.Ed.2d 160 (2007); N. Plains Res. Council v. Fid. Expl. & Dev. Co., 325 F.3d 1155 (9th Cir.), cert. denied, 540 U.S. 967, 124 S.Ct. 434, 157 L.Ed.2d 312 (2003); Catskill Mountains Chapter of Trout Unlimited, Inc. v. City of New York, 273 F.3d 481 (2d Cir. 2001) (“Catskill /”); see also Dubois v. U.S. Dep’t of Agrie., 102 F.3d 1273 (1st Cir. 1996), cert. denied sub nom. Loon Mountain Recreation Corp. v. Dubois, 521 U.S. 1119, 117 S.Ct. 2510, 138 L.Ed.2d 1013 (1997). None of these decisions classified the EPA’s views on the regulation of water transfers as sufficiently formal to warrant Chevron deference. See, e.g., Catskill II, 451 F.3d at 82 (declining to apply Chevron deference framework); Catskill I, 273 F.3d at 491 (same). In response, the EPA took steps to formalize its position. In August 2005, the EPA’s Office of General Counsel and Office of Water issued a legal memorandum written by then-EPA General Counsel Ann R. Klee (the “Klee Memorandum”) that argued that Congress did not intend for water transfers to be subject to the NPDES permitting program. The EPA proposed a formal rule incorporating this interpretation on June 7, 2006, 71 Fed. Reg. 32,887, and then, following noticé- and-comment rulemaking proceedings, on June 13, 2008, adopted a final rule entitled “National Pollutant Discharge Elimination System (NPDES) Water Transfers Rule” (the ‘Water Transfers Rule”), 73 Fed. Reg. 33,697-708 (June 13,2008) (codified at 40 C.F.R. § 122.3(f)). The Water Transfers Rule’s summary states: EPA is issuing a regulation to clarify that water transfers are not subject to regulation under the National Pollutant Discharge Elimination System (NPDES) permitting program. This rule defines water transfers as an activity that conveys or connects waters of the United States without subjecting the transferred water to intervening industrial, municipal, or commercial use. This rule focuses exclusively on water transfers and does not affect any other activity that may be subject to NPDES permitting requirements. Id. at 33,697. The Rule states that water transfers “do not require NPDES permits because they do not result in the ‘addition’ of a pollutant.” Id. at 33,699. No NPDES permit is required if “the water being conveyed [is] a water of the U.S. prior to being discharged to the receiving waterbody” and the water is transferred “from one water of the U.S. to another water of the U.S.” Id. (footnote omitted). Thus, even if a water transfer conveys waters in which pollutants are present, it does not result in an “addition” to “the waters of the United States,” because the pollutant is already present in “the waters of the United States.” Under the EPA’s view, an “addition” of a pollutant under the Act occurs only “when pollutants are introduced from outside the waters being transferred.” Id. at 38,701. On appeal—but not in the Water Transfers Rule itself—-the EPA characterizes this interpretation of Section 402 of the Clean Water Act as embracing what is often referred to as the “unitary-waters” reading of the statutory language, see EPA Br. 15-16, 54, which we will discuss further below. In the Water Transfers Rule, the EPA justified its interpretation of the Act in an explanation spanning nearly four pages of the Federal Register, touching on the text of Section 402, the structure of the Act, and pertinent legislative history. See Water Transfers Rule, 73 Fed. Reg. at 33,700-03. The EPA explained that its “holistic approach to the. text” of the statute was “needed here in particular because the heart of this matter is the balance Congress created between federal and State oversight of activities affecting the nation’s waters.” Id. at 33,701. The agency also responded to a wide variety of public comments on the proposed Rule. See id. at 33,703-06. District Court Proceedings On June 20, 2008, a group of environmental conservation and sporting organizations filed a complaint against the EPA and its Administrator (then Stephen L. Johnson, now Gina McCarthy) in the United States District Court for the Southern District of New York. The States of New York, Connecticut, Delaware, Illinois, Maine, Michigan, Minnesota, Missouri, and Washington, and the Province of Manitoba, Canada (collectively, the “Anti-Rule States”) did the same on October 2, 2008. In their complaints, the plaintiffs requested that the district court hold unlawful and set aside the Water Transfers Rule pursuant to Section 706(2) of the Administrative Procedure Act (the “APA”), 5 U.S.C. § 706(2). In October 2008, the district court consolidated the two cases and granted a motion by the City of New York to intervene in support of the defendants. At about the same time these actions were filed, five parallel petitions for review of the Water Transfers Rule were filed in the First, Second, and Eleventh Circuits. On July 22, 2008, the United States Judicial Panel on Multidistrict Litigation consolidated these petitions and randomly assigned them to the Eleventh Circuit. The Eleventh Circuit then consolidated a sixth petition for review, and stayed all of these petitions pending its disposition of Friends of the Everglades v. South Florida Water Management District, 570 F.3d 1210 (11th Cir. 2009) (“Friends I”), a separate but conceptually related case. The district court in the case now before us granted the EPA’s motion to stay, the proceedings pending the Eleventh Circuit’s resolution of Friends I and the six consolidated petitions. See Catskill Mountains Chapter of Trout Unlimited, Inc. v. EPA, 630 F.Supp.2d 295, 307 (S.D.N.Y. 2009). In June 2009, the Eleventh Circuit issued a decision in Friends I, 570 F.3d 1210 (11th Cir. 2009), reh’g en banc denied, 605 F.3d 962 (2010), cert. denied, 562 U.S. 1082, 131 S.Ct. 643, 645, 178 L.Ed.2d 512, and cer., denied sub nom. Miccosukee Tribe v. S. Fla. Water Mgmt. Dist., 562 U.S. 1082, 131 S.Ct. 645, 178 L.Ed.2d 512 (2010), according Chevron deference to, and upholding, the Water Transfers Rule. Id. at 1227-28. Then, on October 26, 2012, the Circuit issued a decision dismissing the six consolidated petitions for lack of subject-matter jurisdiction under 33 U.S.C. § 1369(b)(1). Friends of the Everglades v. EPA, 699 F.3d 1280, 1286, 1289 (11th Cir. 2012) (“Friends II”), cert. denied, — U.S.—, 134 S.Ct. 421, 187 L.Ed.2d 280, and cert. denied sub nom. U.S. Sugar Corp. v. Friends of the Everglades, — U.S.—, 134 S.Ct. 422, 187 L.Ed.2d 280, and cert. denied sub nom. S. Fla. Water Mgmt. Dist. v. Friends of the Everglades, — U.S.—, 134 S.Ct. 422, 187 L.Ed.2d 280 (2013). The district court in the case at bar lifted the stay on December 17, 2012, the date the Eleventh Circuit’s mandate in Friends II was issued. On January 30, 2013, the district court granted multiple applications on consent to intervene as plaintiffs and defendants under Federal Rule of Civil Procedure 24. This added as intervenor-plaintiffs the Miccosukee Tribe of Indians of Florida, Friends of the Everglades, the Florida Wildlife Federation, and the Sierra Club, and as intervenor-defendants the States of Alaska, Arizona (Department of Water Resources), Colorado, Idaho, Nebraska, Nevada, New Mexico, North Dakota, Texas, Utah, and Wyoming, and various municipal water providers from Western states. The parties filed multiple motions and cross-motions for summary judgment. On March 28, 2014, the district court granted the plaintiffs’ mptions for summary judgment and denied the defendants’ cross-motions. Catskill Mountains Chapter of Trout Unlimited, Inc. v. EPA, 8 F.Supp.3d 500 (S.D.N.Y. 2014). At the first step of the Chevron analysis, the district court decided that the Clean Water Act is ambiguous as to whether Congress intended the NPDES program to apply to water transfers. Id. at 518-32. The district court then proceeded to the second step of the Chevron analysis, at which it struck down the Water Transfers Rule as an unreasonable interpretation of the Act. Id. at 532-67. The defendants and intervenor-defen-dants other than the Northern Colorado Water Conservancy District (hereinafter “the defendants”) timely appealed. DISCUSSION “On appeal from a grant of summary judgment in a challenge to agency action under the APA, we review the administrative record and the district court’s decision de novo.” Bellevue Hosp. Ctr. v. Leavitt, 443 F.3d 163, 173-74 (2d Cir. 2006). We conclude that the Water Transfers Rule is a reasonable interpretation of the Clean Water Act and is therefore entitled to Chevron deference. Accordingly, we reverse the judgment of the district court. We evaluate challenges to an agency’s interpretation of a statute that it administers within the two-step Chevron deference framework. Lawrence + Mem’l Hosp. v. Burwell, 812 F.3d 257, 264 (2d Cir. 2016). At Chevron Step One, we ask “whether Congress has directly spoken to the precise question at issue. If the intent of Congress is clear, that is the end of the matter; for the court, as well as the agency, must give effect to the unambiguously expressed intent of Congress.” Chevron, 467 U.S. at 842-43, 104 S.Ct. 2778. If the statutory language is “silent or ambiguous,” however, we proceed to Chevron Step Two, where “the question for the court is whether the agency’s answer is based on a permissible construction of the statute” at issue. Id. at 843,104 S.Ct. 2778. If it is—i.e., if it is not “arbitrary, capricious, or manifestly contrail to the statute,” id. at 844, 104 S.Ct. 2778—we will accord deference to the agency’s interpretation of the statute so long as it is supported by a reasoned explanation, and “so long as the construction is ‘a reasonable policy choice for the agency to make,’” Nat’l Cable & Telecomms. Ass’n v. Brand X Internet Servs., 545 U.S. 967, 986, 125 S.Ct. 2688, 162 L.Ed.2d 820 (2005) (“Brand X’) (quoting Chevron, 467 U.S. at 845, 104 S.Ct. 2778). This framework has been fashioned as a means for the proper resolution of administrative-law disputes that involve all three branches of the Federal Government, seri-atim. First, the Legislative Branch, Congress, passes a bill that reflects its judgment on the issue—in the case before us, the Clean Water Act. After the head of the Executive Branch, the President, signs that bill, it becomes the law of the land. Second, the Executive Branch, if given the authority to do so by legislation, may address the issue through its authorized administrative agency or agencies, typically although not necessarily by regulation— in this case the EPA through its Water Transfer Rule. In doing so, the executive agency must defer to the Legislative Branch by following the law or laws that it has enacted and that cover the matter. Only last, in case of a challenge to the Legislative Branch’s authority to pass the law, or to the Executive Branch’s authority to administer it in the manner that it has chosen to adopt, may we in the Judicial Branch become involved in the process. When we do so, though, we are not only last, we are least: We must defer both to the Legislative Branch by refraining from reviewing Congress’s legislative work beyond determining what the statute at issue means and whether it is constitutional, and to the Executive Branch by using the various principles of deference, including Chevron deference, which we conclude is applicable in the case at bar. For us to decide for ourselves what in fact is the preferable route for addressing the substantive problem,at hand would be directly contrary to this constitutional scheme. What we may think to be the best or wisest resolution of problems of water transfers and pollution emphatically does not matter. Abiding by this constitutional scheme, we begin at Chevron Step One. We conclude, as did the district court, that Congress did not in the Clean Water Act clearly and unambiguously speak to the precise question of whether NPDES permits are required for water transfers. It is therefore necessary to proceed to Chevron Step Two, under which we conclude that the EPA’s interpretation of the Act in the Water Transfers Rule represents a reasonable policy choice to which we must defer. The question is whether the Clean Water Act can support the EPA’s interpretation, taking into account the full panoply of interpretive considerations advanced by the parties. Ultimately, we conclude that the Water Transfers Rule satisfies Chevron’s deferential standard of review because it is supported by a reasoned explanation that sets forth a reasonable interpretation of the Act. I. Chevron Step One At Chevron Step One, “the [reviewing] court must determine ‘whether Congress has directly spoken to the precise question at issue. If the intent of Congress is clear, that is the end of the matter; for the court, as well as the agency, must give effect to the unambiguously expressed intent of Congress.’” City of Arlington v. FCC, — U.S.—, 133 S.Ct. 1863, 1868, 185 L.Ed.2d 941 (2013) (quoting Chevron, 467 U.S. at 842-43, 104 S.Ct. 2778). To determine whether a statute is ambiguous, we employ “traditional tools of statutory construction” to ascertain if “Congress had an intention on the precise question at issue” that “must be given effect.” Chevron, 467 U.S. at 843 n.9, 104 S.Ct. 2778. The issue before us at this point, then, is whether the Act plainly requires a party to acquire an NPDES permit in order to make a water transfer. We agree with the district court that the Clean Water Act does not clearly and unambiguously speak to that question. We will begin, however, by addressing the plaintiffs’ argument that we previously held otherwise in Catskill I, 273 F.3d 481 (2d Cir. 2001), and Catskill II, 451 F.3d 77 (2d Cir. 2006). A. Catskill I and Catskill II The plaintiffs argue that this case can be resolved at Chevron Step One because we held in Catskill I and Catskill II that the Clean Water Act unambiguously requires NPDES permits for water transfers. We disagree with the plaintiffs’ reading of those decisions because our application there of the deference standard set forth in Skidmore v. Swift & Co., 323 U.S. 134, 65 S.Ct. 161, 89 L.Ed. 124 (1944), and United States v. Mead Corp., 533 U.S. 218, 121 S.Ct. 2164, 150 L.Ed.2d 292 (2001)— so-called “Skidmore” or “Skidmore/Mead” deference—and the reasoning underlying the decisions make clear that we have not previously held that the statutory language at issue here is unambiguous, such that we cannot defer under Chevron to the EPA’s interpretation of the Clean Water Act in the Water Transfers Rule. In Catskill I, we held that that the City of New York violated the Clean Water Act by transferring turbid water from the Schoharie Reservoir through the Shan-daken Tunnel into the Esopus Creek without an NPDES permit, because the transfer of turbid water into the Esopus Creek was an “addition” of a pollutant. 273 F.3d at 489-94. Following our remand in Catskill I, the district court assessed a $5,749,000 civil penalty against New York City and ordered the City to obtain a permit for the operation of the Shandaken Tunnel. The City’s appeal from that ruling was resolved in Catskill II, in which we reaffirmed the holding of Catskill I. Catskill II, 451 F.3d at 79. In both Catskill I and Catskill II, we applied the Skidmore deference standard to informal policy statements by the EPA that interpreted the same provision of the Act at issue here not to require NPDES permits for water transfers. See id. at 83-84 & n.5 (noting that under Skid-more “[w]e ... defer to the' agency interpretation according to its ‘power to persuade’ ” and “declinfing] to defer to the EPA[’s]” informal interpretation of the CWA as expressed in the Klee Memorandum (quoting Mead, 533 U.S. at 235, 121 S.Ct. 2164)); Catskill I, 273 F.3d at 490-91 (applying Skidmore to the EPA’s position as expressed in informal policy statements and litigation positions, and concluding that “we do not find the EPA’s position to be persuasive”). Skidmore instructs that “the rulings, interpretations and opinions” of an agency may constitute “a body of experience and informed judgment to which courts and litigants may properly resort for guidance.” Skidmore, 323 U.S. at 140, 65 S.Ct. 161. The appropriate level of deference accorded to an agency’s interpretation of a statute under the Skidmore standard depends on the interpretation’s “power to persuade,” which in turn depends on, inter alia, “the thoroughness evident in its consideration, the validity of its reasoning, [and] its consistency with earlier and later pronouncements.” Id. This “approach has produced a spectrum of judicial responses, from great respect at one end, to near indifference at the other.” Mead,, 533 U.S. at 228, 121 S.Ct. 2164 (internal citations omitted). Although the Chevron and Skid-more deference standards differ in application, they are similar in one respect: As with Chevron deference, we will defer to the agency’s interpretation under the Skidmore standard only when the statutory language at issue is ambiguous. See, e.g., Riegel v. Medtronic, Inc., 552 U.S. 312, 326, 128 S.Ct. 999, 169 L.Ed.2d 892 (2008) (suggesting that it is “unnecessary” to engage in Skidmore analysis if “the statute itself speaks clearly to the point at issue”); Exxon Mobil Corp. & Affiliated Cos. v. Comm’r of Internal Revenue, 689 F.3d 191, 200 n.13 (2d Cir. 2012) (explaining that Skidmore analysis applies to “an agency’s interpretation of an ambiguous statute”); Wong v. Doar, 571 F.3d 247, 258 (2d Cir. 2009) (concluding that “Congress did not speak directly to the issue” before proceeding to apply Skidmore deference); see also Gen. Dynamics Land Sys., Inc. v. Cline, 540 U.S. 581, 600, 124 S.Ct. 1236, 157 L.Ed.2d 1094 (2004) (“[Deference to [an agency’s] statutory interpretation is called for only when the devices of judicial construction have been tried and found to yield no clear sense of congressional intent.”); High Sierra Hikers Ass’n v. Blackwell, 390 F.3d 630, 638 (9th Cir. 2004) (“If the statute is clear and unambiguous, no .deference is required and the plain meaning of Congress will be enforced.”). As commentators have noted, although the Supreme Court has not explicitly stated “that Skidmore necessarily includes a ‘step one’ inquiry along the lines of Chevron [S]tep [0]ne[,] ... in practice, Skidmore generally does include a ‘step one,’ ” in which a court “first review[s] the statute for a plain meaning [to] determin[e] [whether] the statute [is] ambiguous.” Kristin E. Hickman & Matthew D. Krueger, In Search of the Modem Skidmore Standard, 107 Colum. L. Rev. 1235, 1280 (2007) (collecting cases). But as the dissent correctly notes, see Dissent at 541-42, it does not follow that a particular application of the Skidmore framework implies a threshold conclusion that the relevant statutory language is ambiguous. Although a court could first conclude that the text is unambiguous—and therefore that Skidmore deference is inappropriate or unnecessary—it could instead engage in Skidmore analysis without answering this threshold question by considering the statutory text as one of several factors relevant to determining whether the agency interpretation has the “power to persuade.” Skidmore, 323 U.S. at 140, 65 S.Ct. 161. Yet even under this approach, courts will not rely on agency interpretations that are inconsistent with unambiguous statutory language. See, e.g., EEOC v. Arabian American Oil, 499 U.S. 244, 257, 111 S.Ct. 1227, 113 L.Ed.2d 274 (1991) (declining to rely on an agency interpretation that “lack[ed] support in the plain language of the statute” after considering the statutory language as one of several' factors relevant to Skidmore analysis). Thus, regardless of whether or not a court makes a threshold ambiguity determination, “the Skidmore standard implicitly replicates Chevron’s first step.” Hickman & Krueger, supra, at 1247. Our application of the Skidmore deference standard in Catskill I and Catskill II makes clear that we did not decide and have not decided that the statutory language at issue in this case—“addition ... to navigable waters”—is unambiguous. Although we did not explicitly conclude in those cases that the statutory text was ambiguous, we made clear that we did not intend to foreclose the EPA from adopting a unitary-waters reading of the Act (i.e., waters of the United States means all of those waters rather than each of them) in a formal rule; indeed, we stated in Catskill I that “[i]f the EPA’s position had been adopted in a rulemaking or other formal proceeding, [Chevron ] deference might be appropriate.” Catskill I, 273 F.3d at 490-91 & n.2. This statement implies that we thought the relevant statutory text was at least possibly ambiguous. The few references to “plain meaning” in Catskill I and Catskill II do not compel a different conclusion. The crucial interpretive question framed by Catskill I— which we identified as the “crux” of the appeal—was “the meaning of ‘addition,’ which the Act does not define.” Id. at 486. As the dissent points out, see Dissent at 543-44, we concluded in Catskill I that, based on the “plain meaning” of that term, the transfer of turbid water resulted in “an ‘addition’ of a ‘pollutant’ from a ‘point source’c ... to a ‘navigable water.’ ” Catskill I, 273 F.3d at 492. We do not, however, think that by referring to the “plain meaning” of “addition” in Catskill I we were holding that the broader statutory phrase “addition ... to navigable waters” unambiguously referred to a collection of individual “navigable waters”—such that the term “to navigable waters” could possibly mean only “to a navigable water” or “to any navigable water,” and not to “navigable waters” in the collective singular (i.e., “all the qualifying navigable waters viewed as a single, ‘unitary’ entity”). Nowhere in Catskill I did we state that “navigable waters” or the broader phrase “addition ... to navigable waters” could bear only one meaning based on the unambiguous language contained in the statute. Such a statement would have been inconsistent with our acknowledgment that Chevron deference might be owed to a more formal agency interpretation. Nor did we make any such statement in Catskill II. There, we began by succinctly summarizing Catskill I as “concluding that the discharge of water containing pollutants from one distinct water body into another is an ‘addition of [a] pollutant’ under the CWA.” Catskill II, 451 F.3d at 80 (brackets in original)' (citing Catskill I, 273 F.3d at 491-93). We then again rejected the City’s arguments in favor of reconsidering Catskill I, including its argument in favor of the “unitary-water theory of navigable waters,” essentially for the reasons stated in Catskill I— most importantly, that these arguments “simply overlook[ed]” the “plain language” and “ordinary meaning” of the term “addition.” Id. at 81-84. We also noted that in the then-recent Miccosukee decision, the Supreme Court noted the existence of the unitary-waters theory and raised possible arguments against it, providing further support for our rejection of the theo.-ry in Catskill I. Catskill II, 451 F.3d at 83 (citing Miccosukee, 541 U.S. at 105-09, 124 S.Ct. 1537). Nowhere did we state that the phrase “addition ... to navigable waters” was unambiguous such that it would preclude Chevron deference in the event that the EPA adopted a formal rule. We held only that the EPA’s position, as expressed in an informal interpretation, was unpersuasive under the Skid-more framework. Id. at 83 & n.5 (noting that under Skidmore “[w]e ... defer to the agency interpretation according to its ‘power to persuade’” and “declin[ing] to defer to the EPA” under that standard (quoting Mead, 533 U.S. at '235, 121 S.Ct. 2164)). The best interpretation of Catskill I and Catskill II, we think, is that those decisions set forth what those panels saw as the most persuasive reading of the phrase “addition ... to navigable waters” in light of how the word “addition” is plainly and ordinarily understood. Catskill I and Catskill II did not hold that “addition ... to navigable waters” could bear only one meaning, such that the EPA could not interpret the phrase differently in an interpretive rule. Therefore, as the district court concluded, neither Catskill I nor Catskill II requires us to resolve this appeal at Chevron Step One. B. Statutory Text, Structure, and Purpose Having determined that the meaning of the relevant provision of the Clean Water Act has not been resolved by prior case law, we turn to the overall statute and its context. In evaluating whether Congress has directly spoken to whether NPDES permits are required for water transfers, we employ the “traditional tools of statutory construction.” Li v. Renaud, 654 F.3d 376, 382 (2d Cir. 2011) (quoting Chevron, 467 U.S. at 843 n.9, 104 S.Ct. 2778). We examine the statutory text, structure, and purpose as reflected in its legislative history. See id. If the statutory text is ambiguous, we also examine canons of statutory construction. See Lawrence + Mem’l Hosp., 812 F.3d at 264; see also Am. Farm Bureau Fed’n v. EPA, 792 F.3d 281, 301 (3d Cir. 2015), cert. denied, — U.S.—, 136 S.Ct. 1246, 194 L.Ed.2d 176 (2016); Heino v. Shinseki, 683 F.3d 1372, 1378 (Fed. Cir. 2012); EEOC v. Seafarers Int’l Union, 394 F.3d 197, 203 (4th Cir. 2005). 1. Statutory text and structure. “As with any question of statutory interpretation, we begin with the text of the statute to determine whether the language at issue has a plain and unambiguous meaning.” Louis Vuitton Malletier S.A. v. LY USA Inc., 676 F.3d 83, 108 (2d Cir. 2012). The statutory language at issue is found in Sections 301, 402, and 502 of the Clean Water Act. Section 301(a) states that “[e]xcept as in compliance with [the Act], the discharge of any pollutant by any person shall be unlawful.” 33 U.S.C. § 1311(a). Section 402(a)(1) states that the EPA may issue an NPDES permit allowing the “discharge of any pollutant, or combination of pollutants, notwithstanding [Section 301(a) ],” so long as the discharge meets certain requirements specified by the Clean Water Act and the permit. See id. § 1342(a)(1). Section 502 defines the term “discharge of a poEutant,” in relevant part, as “any addition of any pollutant to navigable waters from any point source.” Id. § 1362(12). Section 502 also defines the term “navigable waters” as “the waters of the United States, including the territorial seas.” Id. § 1362(7). But nowhere do these provisions speak directly to the question of whether an NPDES permit may be required for a water transfer. Nor is the meaning of the relevant statutory text plain. The question, as we have indicated above, is whether “addition of any pollutant to navigable waters”—or, “addition of any pollutant to the waters of the United States”—refers to all navigable waters, meaning all of the waters of the United States viewed as a singular whole, or to individual navigable waters, meaning one of the waters of the United States. The term “waters” may be used in either sense: As the Eleventh Circuit observed, “[i]n ordinary usage ‘waters’ can collectively refer to several different bodies of water such as ‘the waters of the Gulf coast,’ or can refer to any one body of water such as ‘the waters of Mobile Bay.’ ” Friends I, 570 F.3d at 1223. The Supreme Court too has noted that the phrase “[w]aters of the United States,” as used in Section 502, is “in some respects ambiguous.” Rapanos v. United States, 547 U.S. 715, 752, 126 S.Ct. 2208, 165 L.Ed.2d 159 (2006) (internal quotation marks omitted) (emphasis removed). The statutory text yields no clear answer to the question before us; it could support either of the interpretations proposed by the parties. Thus, based on the text alone, we' remain at sea. Unfortunately, placing this statutory language in the broader context of the Act as a whole does not help either. A statutory provision’s plain meaning may be “understood by looking to the statutory scheme as a whole and placing the particular provision within the context of that statute.” Louis Vuitton, 676 F.3d at 108 (quoting Saks v. Franklin Covey Co., 316 F.3d 337, 345 (2d Cir. 2003)). “It is a fundamental canon of statutory construction that the words of a statute must be read in their context and with a view to their place in the overall statutory scheme.” Sturgeon v. Frost, — U.S.—, 136 S.Ct. 1061, 1070, 194 L.Ed.2d 108 (2016) (internal quotation marks omitted) (quoting Roberts v. Sea-Land Servs., Inc., 566 U.S. 93, 132 S.Ct. 1350, 1357, 182 L.Ed.2d 341 (2012)). Examination of the other uses of the terms “navigable waters” and “waters” elsewhere in the Clean Water Act does not establish that these terms can bear only one meaning. The Clean Water Act sometimes regulates individual water bodies and other times entire water systems. As the plaintiffs and the dissent point out, several other provisions in the Clean Water Act suggest that “navigable waters” refers to any of several individual water bodies, specifically the Act’s references to: • “the navigable waters involved,” 33 U.S.C. § 1313(c)(2)(A), (c)(4); • “those waters or parts thereof,” id. § 1313(d)(1)(B); • “all navigable waters,” id. § 1314(a)(2); • “any navigable waters,” id. § 1314(f)(2)(F); • “those waters within the State” and “all navigable waters in such State,” id. § 1314(i)(l)(A)-(B); • “all navigable waters in such State” and “all navigable waters of such State,” id. § 1315(b)(l)(A)-(B); and • “the navigable waters within the jurisdiction of such State,” “navigable waters within [the State’s] jurisdiction,” and “any of the navigable waters,” id. § 1342. But this pattern of usage does not establish that “navigable waters” cannot ever refer to all waters as a singular whole because it also suggests that when Congress wants to make clear that it is using “navigable waters” in a particular sense, it can and sometimes does provide additional language as a beacon to guide interpretation. Cf. Rapanos, 547 U.S. at 732-33, 126 S.Ct. 2208 (holding that “[t]he use of the definite article (‘the’) and the plural number (‘waters’)” made clear that § 1362(7) is limited to “fixed bodies of water,” such as “streams, ... oceans, rivers, [and] lakes,” and does not extend to “ordinarily dry channels through which water occasionally or intermittently flows”). If Congress had thought about the question and meant for Section 502(12) of the Clean Water Act to refer to individual water bodies, it could have referred to something like “any addition of any pollutant to a navigable water from any point source,” or “any addition of any pollutant to any navigable water from any point source.” As the plaintiffs and the dissent would have it, the phrases “addition to navigable waters,” “addition to a navigable water,” and “addition to any navigable water” necessarily mean the same thing, at least in the context of the Act. We do not disagree that the phrases could be interpreted to have the same meaning, but we disagree that this interpretation is clearly and unambiguously mandated in light of how the terms “navigable waters” and “waters” are used in other sections of the Act. We thus see nothing in the language or structure of the Act that indicates that Congress clearly spoke to the precise question at issue: whether Congress intended to require NPDES permits for water transfers. 2. Statutory purpose and legislative history Inasmuch as the statutory text, context, and structure have yielded no definitive answer to the question before us, we conclude the first step of our Chevron analysis by looking to whether Congress’s purpose in enacting the Clean Water Act establishes that the phrase “addition ... to navigable waters” can reasonably bear only one meaning. See Gen. Dynamics, 540 U.S. at 600, 124 S.Ct. 1236 (using both statutory purpose and history at Chevron Step One). Beginning with the name of the statute, it seems clear enough that the predominant goal of the Clean Water Act is to.ensure that our nation’s waters are “clean,” at least in the sense of being reasonably free of pollutants. The Act itself states that, its main objective is “to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters.” 38 U.S.C. § 1251(a). The plaintiffs and the dissent argue that exempting water transfers from the NPDES permitting program could frustrate the achievement of this goal by allowing unmonitored transfers of polluted water from one water body to another. Cf Catskill II, 451 F.3d at 81 (observing that a unitary-waters interpretation of navigable waters would allow for “the transfer of water from a heavily polluted, even toxic, water body to one that was pristine”). As the Supreme Court has noted, however, “no law pursues its purpose at all costs.” Rapanos, 547 U.S, at 752,126 S.Ct. 2208. We see no reason to think that the Clean Water Act is an exception. To the contrary, the Clean Water Act is “among the most complex” of federal statutes, and it “balances a welter of consistent and inconsistent goals,” Catskill I, 273 F.3d at 494, establishing a complicated scheme of federal regulation employing both federal and state implementation and supplemental state regulation, see, e.g., 33 U.S.C. § 1251(g) (federal agencies must cooperate with state and local governments to develop “comprehensive solutions” for pollution “in concert with ... managing water resources”). In this regard, the Act largely preserves states’ traditional authority over water allocation and use, while according the EPA a degree of policymaking discretion and flexibility with respect to water quality standards—both of which might well counsel against requiring NPDES permits for water transfers and instead in favor of letting the States determine what administrative regimen, if any, applies to water transfers. Accordingly, Congress’s broad purposes and goals , in passing the Act do not alone establish that the Act unambiguously requires that water transfers be subject to NPDES permitting. Even careful analysis of the Clean Water Act’s legislative history does not help us answer the interpretive question before us. Although we are generally “reluctant to employ legislative history at step one of Chevron analysis,” legislative history is at times helpful in resolving ambiguity; for example, when the “‘interpretive clues [speak] almost unanimously,’ making Congress’s. intent clear ‘beyond reasonable doubt.’” Mizrahi v. Gonzales, 492 F.3d 156, 166 (2d Cir. 2007) (quoting Gen. Dynamics, 540 U.S. at 586, 590, 124 S.Ct. 1236). But here Congress has not. left us a trace of a clue as to its intent. The more than 3,000-page legislative history of the Clean Water Act appears to be silent, or very nearly so, as to the applicability of the NPDES permitting program to water transfers. See generally Comm, on Env’t. & Pub. Works, 95th Cong., 2d Sess., A Legislative History of the Clean Water Act of 1977 & A Continuation of the Legislative History of the Federal Water Pollution Control Act (1978); Comm, on Pub. Works, 93rd Cong., 1st Sess., A Legislative History of the Water Pollution Control Act Amendments of 1972 (1973). As we noted in Catskill I, the legislative history does not speak to the meaning of the term “addition” standing alone, 273 F.3d at 493, suggesting that the history is similarly silent as. to the meaning of the broader phrase that includes this term, “addition ... to navigable waters.” Finally and tellingly, neither the parties nor amici have pointed us to any legislative history that clearly addresses the applicability of the NPDES permitting program to water transfers. What few examples from the legislative history they have cited—such as the strengthening of the permit requirements in Section 301(b)(1)(C) to include water quality-based limits in addition to technology-based limitations, see William L. Andreen, The Evolution of Water Pollution Control in the United States—State, Local, and Federal Efforts, 1789-1972: Part II, 22 Stan. Envtl. L.J. 215, 270, 275-77 (2003), and broad aspirational statements about the elimination of water pollution and the need to regulate every point source by the report of the Senate’s Environment and Public Works Committee, S. Rep. No. 92-414, at 3738, 3758 (1971), provide at most keyhole-view insights into Congress’s intent. They do not speak to the issue before us with the “high level of clarity” necessary to resolve the textual ambiguity before us at Chevron Step One. Cohen v. JP Morgan Chase & Co., 498 F.3d 111, 120 (2d Cir, 2007). The question is whether Congress has “directly spoken,” Chevron, 467 U.S. at 842, 104 S.Ct. 2778, to whether NPDES permits are required for water transfers—not whether it has made a stray or oblique reference to that issue here and .there. 3. Canons of statutory construction- The traditional canons of statutory construction also provide no clear answer to the question whether Congress intended that the NPDES permitting system apply to water transfers. First, the dissent asserts that the Water Transfers Rule violates the principle that “ ‘[w]here Congress explicitly enumerates certain exceptions to a general prohibition, additional exceptions are not to be implied, in the absence of evidence of contrary legislative intent,’ ” Hillman v. Maretta, — U.S. —, 133 S.Ct. 1943, 1953, 186 L.Ed.2d 43 (2013) (quoting Andrus v. Glover Constr. Co., 446 U.S. 608, 616-17, 100 S.Ct. 1905, 64 L.Ed.2d 548 (1980)). See Dissent at 537-39. Contrary to the dissent’s assertion, however, that canon of construction is not applicable where, as here, the issue is not whether to create an implied exception to a general prohibition, but the scope of the general prohibition itself. Second, the plaintiffs invoke the canon of construction that a “statute should be interpreted in a way that avoids absurd results.” SEC v. Rosenthal, 650 F.3d 156, 162 (2d Cir. 2011) (quoting United States v. Venturella, 391 F.3d 120, 126 (2d Cir. 2004)). They again underscore their arguments concerning statutory purpose in arguing that by allowing for the unpermitted transfer of polluted water from one water body to another, the Water Transfers Rule is contrary to the Act’s principal stated objective: “to restore and maintain the chemical, physical, and biological integrity of the Nation’s waters.” 33 U.S.C. § 1251(a). Additionally, the plaintiffs argue that the Water Transfers Rule may undermine the ability of downstream states to protect themselves from the pollution generated by upstream states. The simplicity of the plaintiffs’ approach helps cloak their arguments with considerable force. But we are ultimately not persuaded that they establish that the Clean Water Act unambiguously forecloses the EPA’s interpretation in the Water Transfers Rule. Indeed, it is unclear to us how one can argue persuasively that the Water Transfers Rule leads to a result so absurd that the result could not possibly have been intended by Congress, while asserting at the same time that it codifies the EPA’s practice of not issuing NPDES permits that has prevailed for decades without Congressional course-correction of any kind. In light of the immense importance of water transfers, it seems more likely that Congress has contemplated the very result that the plaintiffs argue is foreclosed by the Act, and acquiesced in that result. Furthermore, as the plaintiffs would have it, the EPA and the States could not, consistent with the Clean Water Act, select any policy that does not improve water quality as much as is possible. But the Clean Water Act is more flexible than that. Far from establishing a maxi-malist scheme under which water quality must be pursued at all costs, the Act leaves a considerable amount of policymak-ing discretion in the hands of both the EPA and the States—entirely understandably in light of its “welter of consistent and inconsistent goals.” Catskill I, 273 F.3d at 494. We cannot say that the Act could not reasonably be read to permit water transfers to be exempt from the NPDES permitting program, in light of the possibility that other measures will do. Athough the tension between the Rule’s reading of the Act and the statute’s overall goal of improving water quality casts some doubt on the reasonableness of the Rule, it may nevertheless be understandable and permissible if it furthers other objectives of the statute. We think that the legislative compromises embodied in the Act counsel against the application of the absurdity canon here. We generally apply that canon only “where thp result of applying the plain language would be, in a genuine sense, absurd, i.e., where it is quite impossible that Congress could have intended the result and where the alleged absurdity is so clear as to be obvious to most anyone.” Pub. Citizen v. U.S. Dep’t of Justice, 491 U.S. 440, 470-71, 109 S.Ct. 2558, 105 L.Ed.2d 377 (1989) (Kennedy, J., concurring in the judgment) (citation omitted). Exempting water transfers from the NPDES program does not, we conclude, lead directly to a result so absurd it could not possibly have been contemplated by Congress. As to the effect of the Rule on downstream states, even in the absence of NPDES permitting for water transfers, the States can seek to protect themselves against polluted water transfers through other means—for example, through filing a common-law nuisance or trespass lawsuit in the polluting state’s courts, see, e.g., Int'l Paper Co. v. Ouellette, 479 U.S. 481, 497-98, 107 S.Ct. 805, 93 L.Ed.2d 883 (1987)—even if the protections provided by such lawsuits are less robust than those that would be available through the NPDES permitting program’s application to transfers. The inconsistency of the Water Transfers Rule with the Clean Water Act’s primary objective may be a strike against its reasonableness, but only one strike, which is not enough for the EPA’s position to be “out.” Third, arguing to the contrary, the defendants and amicus curiae State of California argue that we should reject the plaintiffs’ preferred interpretation of Section 402 of the Clean Water Act (i.e., that permits are required for water transfers) based on a clear-statement rule and principles of federalism derived from the Supreme Court’s decisions in Solid Waste Agency of Northern Cook County v. United States Army Corps of Engineers, 531 U.S. 159, 121 S.Ct. 675, 148 L.Ed.2d 576 (2001) (“S WANCC’), and Rapanos, as well as the Tenth Amendment. If that were so, it would make our task much easier. But we think it is incorrect. To the extent that SWANCC and Rapanos establish a clear-statement rule, it does not apply here. In SWANCC, the Supreme Court addressed the “Migratory Bird Rule” issued by the U.S. Army Corps of Engineers (the “Corps”) under which the Corps asserted jurisdiction pursuant to Section 404(a) of the Clean Water Act to require permits for the discharge of dredged or fill material into intrastate waters used as habitat by migratory birds. SWANCC, 531 U.S. at 163-64, 121 S.Ct. 675. The Rule applied even to small, isolated ponds located entirely within a single state, such as those located in the abandoned sand and gravel pit there at issue. See id. at 163-65, 121 S.Ct. 675. The Court reasoned that, “[w]here an administrative interpretation of a statute invokes the outer limits of Congress’ power, [it] expect[s] a clear indication that Congress intended that result,” and that “[t]his concern is heightened where the administrative interpretation alters the federal-state framework by permitting federal encroachment upon a traditional state power.” Id. at 172-73, 121 S.Ct. 675. Thus, “where an otherwise acceptable construction of a statute would raise serious constitutional problems, the Court will construe the statute to avoid such problems unless such construction is plainly contrary to the intent of Congress.” Id. at 173, 121 S.Ct. 675 (quoting Edward J. DeBartolo Corp. v. Fla. Gulf Coast Bldg. & Constr. Trades Council, 485 U.S. 568, 575, 108 S.Ct. 1392, 99 L.Ed.2d 645 (1988)). The Supreme Court rejected the Corps’ interpretation because (1) the Migratory Bird Rule “raise[d] significant constitutional questions” with respect to Congress’s authority under the Commerce Clause; (2) Congress had not clearly stated “that it intended § 404(a) to reach an abandoned sand and gravel pit”; and (3) the Corps’ interpretation of Section 404(a) “would result in a significant impingement of the States’ traditional and primary power over land and water use.” Id. at 173-74, 121 S.Ct. 675. In Rapanos, a plurality of the Supreme Court rejected the EPA’s interpretation of the Clean Water Act as providing authority to regulate isolated wetlands lying near ditches or artificial drains that eventually empty into “navigable waters” because the wetlands are adjacent to “waters of the United States.” Rapanos, 547 U.S. at 723-24, 729, 739, 126 S.Ct. 2208. The plurality rejected the interpretation because it “would authorize the Corps to function as a de facto regulator of immense stretches of intrastate land,” which was impermissible because a “ ‘clear and manifest’ statement from Congress” is required “to authorize an unprecedented intrusion” into an area of “traditional state authority” such as the regulation of land use. Id. at 738, 126 S.Ct. 2208 (citation omitted). Citing SWANCC, the Court also noted that “the Corps’ interpretation stretches the outer limits of Congress’s commerce power and raises difficult questions about the ultimate scope of that power,” which further counseled in favor of requiring a clear statement from Congress in order to authorize such jurisdiction. Id. (citing SWANCC, 531 U.S. at 173, 121 S.Ct. 675). The clear-statement rule articulated in SWANCC and Rapanos does not apply here. The case at bar presents no question regarding Congress’s authority under the Commerce Clause, inasmuch as it is undisputed that Congress has the power to regulate navigable waters and to delegate its authority to do so. SWANCC and Rapanos both involved attempts by the Army Corps of Engineers to extend the scope of the phrase “navigable waters” to include areas not traditionally understood to be such. They were therefore treated as attempts by the Corps to stretch the limits of its delegated authority vis-á-vis the States. Here, the EPA is not seeking to expand the universe of waters deemed to be “navigable.” The question before us is not whether the EPA has the authority to regulate water transfers; it is whether the EPA is using (or not using) that authority in a permissible manner. The Clean Water Act was designed to alter the federal-state balance with respect to the regulation of water quality. Congress passed the Act precisely because it found inconsistent state-by-state