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
526–550 of 569Camano Vista Water District
WA5310748 · 591 served
Bucoda Water Dept
WA5309100 · 579 served
Meadowbrook Water Association
WA5353250 · 579 served
Bay Center
WA5304815 · 579 served
Raft Island
WA5370760 · 575 served
City of Sprague
WA5383150 · 570 served
Town of Rockford
WA5373550 · 570 served
Consolidated Support Services
WA5321850 · 569 served
Acme Water District No 18
WA5300250 · 568 served
North Whidbey Water District
WA5361603 · 568 served
Westside Water Assn
WA5394950 · 562 served
Key Center Water System
WA5338450 · 561 served
Sno Pud 1 - Sunday Lake
WA5385205 · 561 served
Tahuyeh Lake Community Club
WA5387116 · 560 served
Dungeness Heights
WA5320425 · 558 served
Oasis Water Corporation
WA5319069 · 556 served
Rainier School
WA5370850 · 556 served
Green Tank Irr District 11
WA5329550 · 553 served
Klickitat Water System
WA5342800 · 551 served
Stevens Co Pud - Valley
WA5305520 · 550 served
Crescent Park 355
WA5316000 · 550 served
Foxhall
WA5310991 · 549 served
Brewster Flat Domestic Water Assn
WA5308290 · 542 served
South Cle Elum Water Dept
WA5381600 · 541 served
Shore Acres Water Company
WA5378455 · 540 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.
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Data source: Utility data from EPA SDWIS. 569 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18