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Regulations last checked for updates: May 17, 2025
Title 40 - Protection of Environment last revised: Nov 17, 2025
All Titles
Title 40
Chapter I
Part 131
Subpart D - Subpart D—Federally Promulgated Water Quality Standards
§ 131.31 - Arizona.
§ 131.32 - [Reserved]
§ 131.33 - Idaho.
§ 131.34 - Kansas.
§ 131.35 - Colville Confederated Tribes Indian Reservation.
§ 131.36 - Toxics criteria for those states not complying with Clean Water Act section 303(c)(2)(B).
§ 131.37 - California.
§ 131.38 - Establishment of numeric criteria for priority toxic pollutants for the State of California.
§ 131.40 - Puerto Rico
§ 131.41 - Bacteriological criteria for those states not complying with Clean Water Act section 303(i)(1)(A).
§ 131.42 - Antidegradation Implementation Methods for the Commonwealth of Puerto Rico.
§ 131.43 - Maine.
§ 131.44 - Florida.
§ 131.45 -
§ 131.46 - Aquatic life criterion for cadmium in Oregon.
§ 131.47 - Aquatic life criteria for aluminum in Oregon.
authority:
33 U.S.C. 1251
source:
48 FR 51405, Nov. 8, 1983, unless otherwise noted.
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