| 40:24.0.1.1.20.4.16.1 | SECTION 131.31
| 131.31 Arizona. | |
| 40:24.0.1.1.20.4.16.2 | SECTION 131.32
| 131.32 [Reserved] | |
| 40:24.0.1.1.20.4.16.3 | SECTION 131.33
| 131.33 Idaho. | |
| 40:24.0.1.1.20.4.16.4 | SECTION 131.34
| 131.34 Kansas. | |
| 40:24.0.1.1.20.4.16.5 | SECTION 131.35
| 131.35 Colville Confederated Tribes Indian Reservation. | |
| 40:24.0.1.1.20.4.16.6 | SECTION 131.36
| 131.36 Toxics criteria for those states not complying with Clean Water Act section 303(c)(2)(B). | |
| 40:24.0.1.1.20.4.16.7 | SECTION 131.37
| 131.37 California. | |
| 40:24.0.1.1.20.4.16.8 | SECTION 131.38
| 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California. | |
| 40:24.0.1.1.20.4.16.9 | SECTION 131.40
| 131.40 Puerto Rico | |
| 40:24.0.1.1.20.4.16.10 | SECTION 131.41
| 131.41 Bacteriological criteria for those states not complying with Clean Water Act section 303(i)(1)(A). | |
| 40:24.0.1.1.20.4.16.11 | SECTION 131.42
| 131.42 Antidegradation Implementation Methods for the Commonwealth of Puerto Rico. | |
| 40:24.0.1.1.20.4.16.12 | SECTION 131.43
| 131.43 Maine. | |
| 40:24.0.1.1.20.4.16.13 | SECTION 131.44
| 131.44 Florida. | |
| 40:24.0.1.1.20.4.16.14 | SECTION 131.45
| 131.45 Revision of certain Federal water quality criteria applicable to Washington. | |
| 40:24.0.1.1.20.4.16.15 | SECTION 131.46
| 131.46 Aquatic life criterion for cadmium in Oregon. | |