33 U.S.C. § 1370 : US Code - Section 1370: State authority

Search 33 U.S.C. § 1370 : US Code - Section 1370: State authority

Except as expressly provided in this chapter, nothing in this
chapter shall (1) preclude or deny the right of any State or
political subdivision thereof or interstate agency to adopt or
enforce (A) any standard or limitation respecting discharges of
pollutants, or (B) any requirement respecting control or abatement
of pollution; except that if an effluent limitation, or other
limitation, effluent standard, prohibition, pretreatment standard,
or standard of performance is in effect under this chapter, such
State or political subdivision or interstate agency may not adopt
or enforce any effluent limitation, or other limitation, effluent
standard, prohibition, pretreatment standard, or standard of
performance which is less stringent than the effluent limitation,
or other limitation, effluent standard, prohibition, pretreatment
standard, or standard of performance under this chapter; or (2) be
construed as impairing or in any manner affecting any right or
jurisdiction of the States with respect to the waters (including
boundary waters) of such States.