Drinking Water Systems

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

Hot Topics

Drought 2023

Active Drinking Water Alerts

Drinking Water Advisory Group (DWAG)

Drinking Water Week

Water System Data

Water System Assistance

Main Page

Capacity Development

Drinking Water State Revolving Fund (DWSRF)

Group B Public Water Systems

Satellite Management Agency (SMA)

Transient Noncommunity Systems

Training

Waterworks Operator Certification

Water System Data (Sentry Internet)

Regulation and Compliance

Main Page

Consumer Confidence Reports (CCR)

Enforcement

Operating Permits

Policies

Rules

Sanitary Surveys

System Design and Planning

Main Page

Cross-connection and Backflow Prevention

Operating Permit Fees

Municipal Water Law

Small Water System Management Program

Water System Plan

Water System Design

Water Use Efficiency

Source Water

Main Page

Source Water Protection

Groundwater Under the Influence of Surface Water (GWI)

Source Water Assessment Program (SWAP) Maps

Surface Water

Contaminants

Main Page

Arsenic

Chromium in Drinking Water

Coliform

Revised Total Coliform Rule (RTCR)

Copper

Cryptosporidium

Disinfection Byproducts

Lead

Lead in School Drinking Water

Nitrate

Lab Templates (test panels)

PFAS

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