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 - Revision of certain Federal water quality criteria applicable to Washington.
- § 131.46 - Aquatic life criterion for cadmium in Oregon.
- § 131.47 - Aquatic life criteria for aluminum in Oregon.