Pacific Southwest, Region 9
Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations
Monitoring, Assessment and TMDLs
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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.
Water Quality Standards
Information on Arizona’s Surface Water Quality Standards can be found at the Arizona Water Quality Standards page.
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.
Karin Graves (firstname.lastname@example.org)
U.S. Environmental Protection Agency
75 Hawthorne St, WTR-2
San Francisco, CA 94105
Tel. (415) 972-3153
- EPA’s partial approval/partial disapproval letter (PDF) (2 pp, 100K) and enclosure (PDF) (12 pp, 200K), with the added waters
- EPA’s Public Notice for public comment period (PDF) (1 pp, 100K)
- EPA’s June 2013 letter with enclosure (PDF) (11p, 117K) conveying the final list and response to comments
Arizona’s 2010 Section 303(d) list of waters requiring a TMDL is available at the Arizona Department of Environmental Quality (ADEQ) Webpage.
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 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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