State Hub
Washington Water Quality
569
Utilities in database
9.2M
Residents served
22%
On private wells
2
Key contaminants tracked
Drinking Water in Washington
Washington has 569 community water systems serving approximately 9.2 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead. 22% of Washington residents rely on private wells. DOH holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Washington
501–525 of 569Town of Fairfield
WA5324450 · 643 served
Startup Water District
WA5383850 · 643 served
Cedar Creek Corrections Center
WA5311882 · 639 served
Jaw Farms Inc
WA5308246 · 636 served
Alderwood Estates
WA5301270 · 635 served
Duck Lake Water Association
WA5320200 · 635 served
Colton Water Department
WA5314100 · 632 served
Glenwood Water System
WA5328220 · 629 served
Bywater Bay
WA5302043 · 628 served
Priest Point Beach Water Inc
WA5369450 · 624 served
Bridgehaven Community Club
WA5308330 · 623 served
Mecca Community Association
WA5322888 · 619 served
Ridge Water Association
WA5303456 · 615 served
Lacamas Farmsteads
WA5302117 · 615 served
Wicks Lake Ranches
WA5396728 · 615 served
Sumas Rural Water Association
WA5384850 · 612 served
Lewis Co Water Dist #3
WA5365550 · 611 served
Seabeck
WA5303134 · 610 served
Jefferson County Water Dist #1
WA5336705 · 600 served
Mckenna Water District
WA5303521 · 600 served
Albion Water Dept
WA5300800 · 600 served
Wishram Water System
WA5397950 · 599 served
Dallesport Water District
WA5317715 · 598 served
Sandy Hook Park Community Club
WA5375950 · 593 served
Town of Metaline Falls
WA5354250 · 593 served
Key Contaminant Concerns in Washington
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Washington Water FAQs
Quick Links
Data source: Utility data from EPA SDWIS. 569 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18