Summary

EPA is soliciting public comments on EPA’s action to add six waterbody-pollutant combinations to Arizona’s 2016 list of waters requiring a total maximum daily load (TMDL). On May 23, 2017 Arizona submitted its list of waters requiring a TMDL under Clean Water Act Section 303(d)(2). Section 303(d)(2) requires that states submit and EPA approve or disapprove lists of waters that do not meet water quality standards, where existing technology-based pollution controls are not stringent enough to attain, or maintain, state water quality standards, and for which a TMDL must be prepared. Arizona identified, in its 2016 303(d) list, various waterbody-pollutant combinations as requiring TMDLs. See, 2016 303(d) list (“Appendix C – Impaired Waters List”), available at the Arizona Department of Environmental Quality web site.Exit

On July 26, 2017, EPA determined that Arizona's list of waters requiring a TMDL partially met the requirements of Clean Water Act Section 303(d), and approved each of the State's listings included in its 2016 303(d) list. During its review, EPA also identified several waters and associated pollutants that met federal listing requirements but were not included in Arizona’s list. Accordingly, EPA has identified additional waterbody-pollutant combinations as requiring a TMDL. EPA’s determination and the list of waterbody-pollutant pairs that EPA has added are available on EPAs website.

This notice announces EPA’s action to add the waterbody-pollutant combinations to Arizona’s 2016 Section 303(d) list. After considering public comments, U.S. EPA will make any necessary adjustments to its decision and transmit the final list to the state.