On September 14, 2018, EPA determined that Arizona's 2018 303(d) List partially met the requirements of Clean Water Act Section 303(d), and approved each of the State's listings included in its 2018 303(d) List. The approval letter and enclosure are provided below
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EPA Letter to Arizona Department of Environmental Quality (PDF)(2 pp, 683 K,
9/14/2018)
EPA's letter to the Arizona Department of Environmental Quality regarding Arizona 2018 Clean Water Act Section 303(d) List of Impaired Waters.
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Enclosure: EPA's Review of Arizona’s 2018 Section 303(d) List (PDF)(10 pp, 501 K,
9/14/2018)
EPA's rationale for EPA's approval of Arizona’s 2018 list of water quality limited segments requiring a Total Maximum Daily Load (TMDL) under Clean Water Act, Section 303(d).