2024 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2023 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2022 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2021 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2020 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2019 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2016 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2015 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2014 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2010 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program

2009 40 CFR 131.8 – Requirements for Indian Tribes to administer a water quality standards program