Washington Drinking Water: What you need to know

Governing Law and Regulations

Public water supplies: Washington Administrative Code (WAC) 246-290-001 to 246-290-060

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Planning and engineering: WAC 246-290-100 to 246-290-140

Public water system design requirements: WAC 246-290-200 to 246-290-250

Water quality monitoring: WAC 246-290-300 to 246-290-320

Operation of water systems: WAC 246-290-415 to 246-290-500

Treatment of surface water: WAC 246-290-601 to 246-290-640

Requirements for filtration systems: WAC 246-290-650 to 246-290-678

Unfiltered systems: WAC 246-290-686 to 246-290-696

Consumer confidence reports: WAC 246-290-72001 to 246-290-72012

Operating permit categories:

Group A: WAC 246-290

Group B: WAC 246-291

Plan and operator certification fees: WAC 246-292-001 to 246-292-160

Drinking Water State Revolving Fund (DWSRF): WAC 246-296-010 to 246-296-190

Water system ownership: WAC 246-290-035 and WAC 246-291-250

Drought conditions: WAC 173-166-060

Water well drilling: WAC 173-162-010

Types of operator licenses: WAC 173-162-055

Examination topics: WAC 173-162-100

Regulatory Agencies

Washington State Department of Health (DOH) Division of Drinking Water

Washington Public Works Board

Washington Department of Ecology (WDOE) Water Resources Program

Department of Social and Health Services

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

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. The state generally follows the federal rules for drinking water required under the Safe Drinking Water Act (SDWA). In addition to the federal requirements, Washington has a Maximum Contaminant Level of 0.1 milligrams per liter for nickel. Washington has adopted the federal Revised Total Coliform Rule (RTCR). For more information on the RTCR and the ...

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Governing Law and Regulations
Regulatory Agencies
Comparison: State vs. Federal
State Requirements

State Requirements

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Washington Drinking Water Resources

Drinking Water Products

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