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Washington Pretreatment Standards: What you need to know

Governing Law and Regulations

National Pollutant Discharge Elimination System (NPDES) permits: Washington Administrative Code (WAC) 173-220-010 to 173-220-240

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State waste discharge permits: WAC 173-216-010 to 173-216-150

Sewage system authority: WAC 173-208-010 to 173-208-120

Conformity with state rules: WAC 173-208-090

Program reviews: WAC 173-208-110

Permit appeals: WAC 173-208-120

Biosolids management: WAC 173-308-270

Annual reports: WAC 173-308-295

Regulatory Agencies

Washington Department of Ecology (WDOE) Water Quality Program

U.S. Environmental Protection Agency (EPA) Region 10

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Washington has been delegated authority from EPA to administer the pretreatment program in the state. To find the applicable requirements for a specific facility, users must contact the pretreatment coordinator in the region where the facility is located (southwest, northwest, central, and eastern).

Washington requires a permit for industrial facilities discharging wastewater into publicly owned treatment works (POTWs). Industrial facilities that discharge into a POTW must pretreat their wastewater using technology-based standards. See the national section PRETREATMENT STANDARDS for additional guidance.

For a given facility, state waste discharge permit requirements and NPDES permit requirements are, under normal circumstances, contained in a single permit document.

The state has also developed additional requirements for biosolids management, including permitting.

Administration and enforcement. WDOE's Water Quality Program is responsible for the administration and ...


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State Requirements

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Washington Pretreatment Standards Resources

Pretreatment Standards Products

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