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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

On June 19, 2013, EPA partially approved and partially disapproved Arizona’s 2010 303(d) list of waters requiring a Total Maximum Daily Load (TMDL). EPA approved waters Arizona identified as requiring a TMDL, and disapproved the omission of 2 waters EPA determined to be impaired due to mercury in fish tissue. EPA’s action added the 2 identified water body – pollutant combinations.

Following a public comment period on EPA’s notice to add waters, on June 19, 2013, EPA transmitted to the state the final list of added water body – pollutant combinations and a responsiveness summary addressing how public comments were considered in the final EPA decision. Provided below are the March 2013 partial approval / partial disapproval letter and the June 2013 letter and enclosure presenting the final list of added waters and responsiveness summary (see EPA documents).  The State’s 303(d) lists are available at the link under State Documents, below.

Contact Information

Karin Graves (graves.karin@epa.gov)
U.S. Environmental Protection Agency
75 Hawthorne St, WTR-2
San Francisco, CA 94105
Tel. (415) 972-3153

EPA Documents

State Documents

Arizona’s 2010 Section 303(d) list of waters requiring a TMDL is available at the Arizona Department of Environmental Quality (ADEQ) Webpage.  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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