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Contact EPA Pacific Southwest Water Division

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Monitoring, Assessment and TMDLs

Monitoring, Assessment and TMDLs Quick Finder
Monitoring & TMDLs Home 303(d) lists EPA-established TMDLs EPA-lead TMDLs: Completed Monitoring Arizona TMDLs California TMDLs Hawai'i TMDLs Nevada TMDLs Pacific Islands TMDLs TMDL Contacts
San Pedro River, Arizona
San Pedro River, Arizona

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Arizona Water Quality

Arizona Department of Environmental Quality is responsible for conducting monitoring, assessment, reporting under CWA Sections 303(d) and 305(b), and TMDL development for the State of Arizona. More information about Arizona's programs may be found at Arizona Department of Environmental Quality's Water Quality Monitoring and Assessment page. Exiting EPA (disclaimer)

Water Quality Standards

Information on Arizona’s Surface Water Quality Standards can be found at the Arizona Water Quality Standards Exiting EPA (disclaimer) page.

EPA and Arizona Water Quality Contacts

Water Quality Assessment TMDL Summary Information for Arizona

Arizona's Integrated Report



EPA's July 26, 2017 Action to Add Waters to Arizona's 2016 List of Waters Requiring a Total Maximum Daily Load.

EPA Documents 

State Documents 

Arizona's 2016 Clean Water Act Section 303(d) list of waters requiring a TMDL is at the Arizona Department of Environmental Quality (ADEQ) website. Exiting EPA (disclaimer)

TMDLs in Arizona

Information on the status of TMDLs being developed or previously developed by Arizona DEQ can be found on Arizona DEQ's TMDL Program Monitoring and Assessment page Exiting EPA (disclaimer) and EPA's Water Quality Assessment Report for Arizona. (Please note that the EPA TMDL tracking system is updated periodically but may not include all approved TMDLs.) In addition, EPA completed one TMDL for copper in Pinto Creek, AZ at the request of the State of Arizona.

Pinto Creek Copper TMDL

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