^ ^ United States Environmental Protection A2encv
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5	Office ot' General Counsel
| ?	Washington. D.C 20460
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US Environmental Protection Agerltfjiited States Department of the Army
Water Resource Center RC-4100	y $ Armv Corps or Engineers
1200 Pennsylvania Ave NW	Washington, DC 20314
Washington DC 20460
1 - JAN l'jO i
MEMORANDUM
SUBJECT: Supreme Court Ruling Concerning CWA Jurisdiction over Isolated Waters
FROM: Gary S. Guzy
General Counsel
U.S Environmental Protection Agency
Robert M. Anderse^
Chief Counsel ^
U S Army Corps of Engineers
TO'	See Distribution
The purpose of this memorandum is to inform you of a significant new ruling by
the Supreme Court pertaining to the scope of regulatory jurisdiction under the Clean
Water Act (CWA) and to inform you of what is and is not affected by this ruling Solid
Waste Agency of Northern Cook County v U S. Army Corps of Engineers, No. 99-1178
(January 9, 2001) ("SWANCC") involved statutory and constitutional challenges to the
assertion of CWA jurisdiction over isolated, non-navigable, intrastate waters used as
habitat by migratory birds
Although the SWANCC case itself specifically involved section 404 cf the CWA
the Court's decision affects the scope of regulatory jurisdiction under other provisions
of the CWA as well, including the section 402 NPDES program and the section 311 oil
spill program Under each of these sections, the Agencies have jurisdiction over
"waters of the United States " CWA § 502(7) Accordingly, the following discussion
applies to any program that involves "waters of the United States" as that term is used
in the CWA, and will be relevant to any federal, state, cr tribal staff involved in
implementing sections 402. 404, 311, and any other provision of the CWA which

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applies the definition of "waters of the United States
In the 5-4 decision, the Supreme Court held that the Corps exceeded its
statutory authority by asserting CWA jurisdiction over "an abandoned sand and gravel
pit in northern Illinois which provides habitat for migratory birds " Slip op at 1 The
Court did not reach the question of 'whether Congress could exercise such authority
consistent with the Commerce Clause, U S Const, Art I, § 8, cl 3" Slip op at 1 It
summarized its holding as follows "We hold that 33 C F R § 328 3(a)(3) (1999), as
clarified and applied to petitioner's balefil! site pursuant to the 'Migratory Bird Rule,' 51
Fed Reg 41217 (1986), exceeds the authority granted to respondents under § 404(a)
of the CWA." Id. at 14 2 Although the Court held that the Corps' application of §
328 3(a)(3) was invalid in SWANCC. ttie Court did not strike down §328 3(a)(3) or any
other component of the regulations defining "waters of the United States."
While the Court's actual holding was narrowly limited to CWA regulation of
"nonnavigable, isolated, instrastate" waters based solely on the use of such waters by
migratory birds, the Court's discussion was wider ranging. For example, the Court
clearly recognized the CWA's assertion of jurisdiction over traditional navigable waters
and their tributaries and wetlands adjacent to them Slip op at 6, 10 The Court also
expressly declined to address certain other aspects of the scope of CWA jurisdiction
Slip op at 10 As a result, the Court's opinion has led to questions concerning the
effect of the decision on other waters withm the definition of "waters of the United
'The SWANCC decision only addresses the scope of regulatory jurisdiction
under the federal CWA. Therefore, the scope of regulatory jurisdiction over aquatic
features under other federal statutes is not affected by this decision In addition, the
Clean Water Act explicitly provides that nothing in the Act "shali. be construed as
impairing or in any manner affecting any nght or jurisdiction of the States with respect
to the waters (including boundary waters) of such States." 33 U.S.C. § 1370.
Therefore, nothing in the SWANCC decision alters the extent of State (or tribal)
jurisdiction over aquatic features under State (or tribal) law
33 C F R § 328(a)(3) describes a subset of "waters of the United States'
All other waters such as intrastate lakes, rivers, streams (including intermittent
streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa
lakes, or natural ponds, the use, degradation, or destruction of which could affect
interstate or foreign commerce .
The "Migratory Bird Rule" refers to an explanation, in the preambles to 1986
Corps regulations and 1988 EPA regulations, that waters that are or may be used as
habitat for migratory birds are an example of waters whose use, degradation, or
destruction could affect interstate or foreign commerce and therefore are "waters of the
United States " 51 Fed Reg 41217 (1986); 53 Fed Reg. 20765 (1988)

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States" in agency regulations. Accordingly, this memorandum describes which aspects
of the regulatory definition of "waters of the United States" are and are not affected by
SWANCC.
1 In light of the Court's "conclusion] that the 'Migratory Bird Rule' is not fairly
supported by the CWA," slip op. 6, field staff should no longer rely on the use of waters
or wetlands as habitat by migratory birds as the sole basis for the assertion of
regulatory jurisdiction under the CWA
2.	As noted above, the Court's holding was strictly limited to waters that are
"nonnavigable, isolated, [and] instrastate." With respect to any waters that fall outside
of that category, field staff should continue to exercise CWA jurisdiction to the full
extent of their authority under the statute and regulations and consistent with court
opinions.
3.	The Court did not overrule the holding or rationale of United States v
Riverside Bawiew Homes. Inc . 474 U.S. 121 (1985), which upheld the regulation of
traditionally navigable waters, interstate waters, their tributaries, and wetlands adjacent
to each. See ii at 123, 129,139 Each of these categories is still considered "waters
of the United States," as is discussed below in paragraphs 4 and 6.
4 Because the Court's holding was limited to waters that are "non-navigable,
isolated, [and] intrastate," the following subsections of the regulatory definition of
"waters of the United States"3 are unaffected by SWANCC
"(1) All waters which are currently used, or were used in the past, or may
be susceptible to use in interstate or foreign commerce, including all
waters which are subject to the ebb and flow of the tide" (see, e g ,
SWANCC, sjip op. at 7-8),
"(2) All interstate waters including interstate wetlands" (see, e g , CWA
section 303(?)(1); Hodel v Virginia Surface Mining and Reclamation
Ass'n. 452 UlS 264, 282 (1931)),
"(4) All impoundments cf waters otherwise defined as waters of the United
States under the definition (except subsection (a)(3) waters]" (implicit in
SWANCC. slip op. at 6),
'Different CWA regulations contain slightly different formulations of the
definition. For simplicity's sake, this memo refers to the Corps' version at 33 C F R §
328.3(a). Other versions appear at, e.g , 40 CFR §§ 110 1, 112 2,116 3, 117 1, 122 2
230.3(s), and 232.2.

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"(5) Tributaries to waters identified in paragraphs (a)( 1)[. (2), and] (4) of
this section' (see. e g , SWANCC. slip op at 10);
"(6) The territorial seas" (see CWA section 502(7)), and
"(7) WetJands adjacent to waters (other than waters which are themselves
wetlands) identified in paragraphs (a)(1)[,(2), (4), (5), and] (6) of this
section" (see, e.g , SWANCC, slip op. at 6, Riverside Bawiew at 134-35,
139)/
5 The following subsections of the regulatory definition of "waters of the United
States" are, or potentially are, affected by SWANCC-
"(3) All other waters such as intrastate lakes, rivers, streams (including
intermittent streams), mudflats, sandflats, wetlands, sloughs, praine
potholes, wet meadows, playa lakes, or natural ponds, the use,
degradation, or destruction of which could affect Interstate or foreign
commerce
a.	Waters covered solely by subsection (a)(3)5 that could affect
interstate commerce solely by virtue of their use as habitat by migratory birds are no
longer considered "waters of the United States." The Court's opinion did not specifically
address what other connections with interstate commerce might support the assertion
of CWA jurisdiction over "nonnavigable, isolated, intrastate waters" under subsection
(a)(3). Therefore, as specific cases anse, please consult agency legal counsel
b.	The Court's opinion expressly reserved the question of what "other
waters" were intended to be addressed by CWA § 404(g)(1) (regarding state 404
programs), factors not addressed in SWANCC may have a bearing on whether
subsection (a)(3) may still be relied on as the basis for asserting CWA jurisdiction over
certain "other waters." Jurisdiction over such "other waters" should be considered on a
case-by-case basis in consultation with agency legal counsel. Factors that may be
relevant to the analysis under 33 C F R. 328 3(a)(3) include, but are not limited to, the
following:
4 "Adjacent" is defined by regulation as "bordering, contiguous, or neighboring.
Wetlands separated from other waters of the United States by man-made dikes or
barriers, natural nver berms, beach dunes, and the like are 'adjacent wetlands '0 33
C.F R. § 328.3(d). This definition was approved in Riverside Bawiew and is not
undercut by SWANCC.
s Subsection (a)(3) is intended to cover waters that are not covered by the other
subsections of § 328.3(a)

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(1)	With respect to waters that are isolated, intrastate, and nonnavigable --
jurisdiction may be possible if their use, degradation, or destruction could affect other
"waters of the United States," thus establishing a significant nexus between the water in
question and other "waters of the United States,"
(2)	With respect to waters that, although isolated and intrastate, are navigable -
jurisdiction may also be possible if their use, degradation, or destruction could affect
interstate or foreign commerce (examples of ways the use. degradation or destruction
of a water could affect such commerce are provided at 33 CFR 328.3(a)(3)(i) - (ni))6
c. Impoundments of subsection (a)(3) waters, tributaries of (a)(3) waters,
and wetlands adjacent to subsection (a)(3) waters should be analyzed on a case-by-
case basis in accordance with subparagraphs 5.a and 5.b immediately above. Such
impoundments, tributaries and adjacent wetlands are also part of the "waters of the
United States" if the waters they impound, are tributaries to, or are adjacent to are
themselves "waters of the United States."
6. The Supreme Court's decision in SWANCC does provide an important new
limitation on how and in what circumstances the EPA and the Corps can assert
regulatory authority under the CWA. However, this decision's limited holding must be
interpreted in light of other Supreme Court and lower court precedents, unaffected by
the SWANCC decision, which precedents broadly uphold CWA jurisdictional authority.
The following quotations from the Riverside Bavview decision are provided to remind
EPA and Corps field offices that most CWA jurisdiction remains basically intact after
the SWANCC decision.
a. The Supreme Court's Riverside Bavview decision (at 123,139) upheld
the legality of the basic provisions of the Corps' CWA jurisdictional regulation, which
the Court described (at 129) as follows. "The {Corps and EPA jurisdictional] regulation
extends the Corps' authority under Section 404 to all wetlands adjacent to navigable or
interstate waters and their tributaries "7
6An example of an intra-state lake that is "isolated'1 (i e , not part of the tributary
system of traditional navigable waters or interstate waters) but which might reasonably
be considered "waters of the United States" under subsections (a)(1) or (a)(3) is the
Great Salt Lake in Utah That "isolated" lake is navigable-in-fact (see United States v
Utah, 403 U.S. 9 (1971)), and has substantial connections with interstate commerce
(see, e g., Hardy Salt Co..v. Southern Pacific Transportation Co.. 501 F. 2d 1156 (10th
Cir. 1974))
7 The one specific part of the Corps' CWA junsdiction that the Court did not
(continued )

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b.	The Court in Riverside Bavview also stated, at 132-33, that
.. Sectiom404 originated as part of the Federal Water Pollution Control
Act Amendments of 1972, which constituted a comprehensive legislative
attempt to restore and maintain the chemical, physical, and biological
integrity of the Nation's waters.' CWA§ 101, 33 U S C §1251. This
objective incorporated a broad, systemic view of the goal of maintaining
and improving water quality: as the House Report on the legislation put it,
"the word 'integrity' .. refers to a condition in which the natural structure
and function of ecosystems is [are] maintained. Protection of aquatic
ecosystems, Congress recognized, demanded broad federal authority to
control pollution, for '[w]ater moves in hydrologic cycles and it is essential
that discharge of pollutants be controlled at the source. . . In keeping
with these views, Congress chose to define the waters covered by the Act
broadly.
c.	In Riverside Bavview. at 133-134, the Court quoted with approval the
following language from the preamble to the Corps' 1977 regulations-
" The regulation of activities that cause water pollution cannot rely on
artificial lines ... but must focus on all waters that together form the entire
aquatic system. Water moves in hydrologic cycles, and the pollution of
this part of the aquatic system, regardless of whether it is above or below
an ordinary high water mark, or mean high tide line, will affect the water
quality of the other waters within that aquatic system. For this reason, the
landward limit of Federal jurisdiction under Section 404 must include any
adjacent wetlands that form the border of or are in reasonable proximity to
other waters of the United States, as these wetlands are part of this
aquatic system."
The Court went omto conclude, at 134, that: "In view of the breadth of federal
regulatory authority contemplated by the Act itself.. the Corps' ecological judgment
about the relationship between waters and their adjacent wetlands provides an
adequate basis for a legal judgment that adjacent wetlands may be defined as waters
under the Act."
d.	In sum, the holding, the facts, and the reasoning of United States v
Riverside Bavview Homes continue to provide authority for the EPA and the Corps to
assert CWA jurisdiction oyer, inter alia, all of the traditional navigable waters, all
'(...continued)
reach in Riverside Bavview related to "wetlands that are not adjacent to bodies of open
water" under 33 C.F.R. 328 3(a)(2) or (3). Riverside Bavview. 474 U.S. at 131. n 8.

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interstate waters, and all tributaries to navigable or interstate) waters, upstream to the
highest reaches of the tributary systems, and over all wetlands adjacent to any and all
of those waters.
Any questions not answered by this guidance should be addressed to legal
staff attorneys Cathy Winer (EPA) at (202) 564-5494 or Lanc£ Wood (Corps) at
(202) 761-8556.
Distribution:
Assistant Administrator for Water (4101)
Assistant Administrator for Solid Waste and Emergency Response (5101)
Assistant Administrator for Enforcement and Compliance Assurance (2201A)
Commander, U.S. Army Corps of Engineers
Deputy Commander, Civil Works, USACE
Regional Administrators, Regions l-X
Commanders, Maji>r Subordinate Commands, USACE
Commanders, Engineer Districts, USACE
Elaine Davies, Acting Director, Office of Emergency ahd Remedial Response
Office Directors, Ojffice of Water
Water Division Directors, Regions l-X
Regional Counsels, Regions l-X
Division and District Counsels, USACE

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