Monitoring, Assessment and TMDLs

Monitoring, Assessment and TMDLs Quick Finder
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San Pedro Creek, 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.

Water Quality Standards

Information on Arizona’s Surface Water Quality Standards can be found at the Arizona Water Quality Standards page.

EPA and Arizona Water Quality Contacts

Water Quality Assessment TMDL Summary Information for Arizona

Arizona's Integrated Report

On March 1, 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 6 waters EPA determined to be impaired due to mercury in fish tissue, and exceedances of the ammonia, copper and chlorine water quality standards. EPA is taking action to add the 6 identified impaired waters.

EPA is starting a public comment period during which interested parties are invited to submit written comments on EPA’s action to add the identified 6 waters. The partial approval / partial disapproval letter and a link to the States list are provided below.

All interested persons wishing to submit comments on EPA’s action to add waters to Arizona’s 2010 list of impaired waters may do so in writing on or before April 8, 2013, 5pm, to Karin Graves at the email address or US Mail address below.

After considering the public comments received, U.S. EPA will make any necessary adjustments to its decision and transmit the final list to the state. EPA will prepare a document summarizing how public comments were considered in the final EPA decisions. The summary of comments and responses will be available at this website when the 2010 303(d) list for Arizona is finalized.

Contact Information
Karin Graves (graves.karin@epa.gov)
75 Hawthorne Street, WTR-2
San Francisco, CA 94105
Tel. (415) 972-3153

EPA Documents

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) Comments due by April 8, 2013

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

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