Impaired Waters and TMDLs in the Pacific Southwest (Region 9)
EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 Tribal Nations.
States and territories in EPA's Pacific Southwest (Region 9) maintain programs that conduct water quality monitoring, develop assessment reports, and develop Total Maximum Daily Loads (TMDLs) for impaired waters. More information about individual State and Territory programs can be found below.
State Programs in Region 9
- Arizona Department of Environmental Quality (AZDEQ)
- California State Water Resources Control Board
- California Water Quality Monitoring Council
- Hawaii Department of Health
- Nevada Division of Environmental Protection (NDEP)
- American Samoa Environmental Protection Agency
- Commonwealth of Northern Marianas Islands (CNMI) Bureau of Environmental and Coastal Quality
- Guam Environmental Protection Agency
Public Notice
Public notices related to monitoring, assessment and TMDLs will appear here when available.