Surface Water Protection

Waters of the United States (WOTUS)

A new definition for a Waters of the United States (WOTUS) in the Navigable Waters Protection Rule became effective on June 22, 2020 | View >

The State supports the narrower definition in the rule. The waters of the state are unique, and ADEQ believes it is best for Arizona to address Arizona waters locally in practical and pragmatic ways.

Along with state and federal agency partners, ADEQ is evaluating data sources, decision criteria, continuously improvement of flow regime maps, and refining a Screening Toolkit for evaluating jurisdictional status of Arizona surface waters | Learn More >

ADEQ acknowledges the new definition creates a gap in protection for some Arizona waterways and supports developing a "local control approach" at the state level to protect Arizona’s important and precious water resources. ADEQ is actively working with stakeholders on a program outline to protect surface waters of the state | View >

When the new definition was proposed by the U.S. Environmental Protection Agency (EPA) and the Department of the Army (Army), ADEQ conducted stakeholder meetings, gathered input, and submitted comments to the EPA, in collaboration with other state agencies | View >

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