More than 6.2 million Washington State residents, 85 percent of the state's population, get their drinking water from public water systems. Public water systems and their water works operators are our first line of defense against contaminants getting into our public water supply and people getting sick.
This page is for water system owners and operators. For consumer information, go to Drinking Water in Your Home.
Hot Topics and Other News
Drinking Water Advisory Group (DWAG)
Water System Assistance
Water System Assistance Main Page
Alternative Drinking Water Program
Group A Community Water Systems
Drinking Water State Revolving Fund (DWSRF)
Non-Transient Non-Community (NTNC) Water Systems
Satellite Management Agency (SMA)
Transient Non-Community (TNC) Water Systems
Waterworks Operator Certification
Water System Data (Sentry Internet)
Regulation and Compliance
Regulation and Compliance Main Page
Consumer Confidence Reports (CCR)
System Design and Planning
System Design and Planning Main Page
Cross-connection and Backflow Prevention
Small Water System Management Program
Source Water
Groundwater Under the Influence of Surface Water (GWI)
Source Water Assessment Program (SWAP) Maps
Contaminants
Revised Total Coliform Rule (RTCR)
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