County · Washington
King County, Washington: drinking water records
This overview covers 86 ZIP codes and 155 community water systems in King County. It also stands in for 1 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| King County Water District #54 WA5339950 | 5,373 | 120 | 0 | 1 | 1.2 ppb |
| Water District 19 WA5338900 | 5,335 | 360 | 0 | 2 | 3 ppb |
| Seattle Public Utilities WA5377050 | 1,161,961 | 240 | 0 | 0 | 1.6 ppb |
| Kent Water Department WA5338150 | 166,421 | 420 | 1 | 0 | 0 ppb |
| Redmond Water System City of WA5371650 | 163,335 | 300 | 2 | 0 | 2 ppb |
| Lakehaven Water and Sewer District WA5341997 | 148,809 | 1,020 | 6 | 0 | 3.3 ppb |
| Renton City of WA5371850 | 108,091 | 180 | 1 | 0 | 1.9 ppb |
| Auburn City of WA5303350 | 107,655 | 360 | 1 | 0 | 2.2 ppb |
| Highline Water District WA5340650 | 100,170 | 240 | 0 | 0 | 1.4 ppb |
| Northshore Utility District WA5340800 | 99,789 | 120 | 0 | 0 | 36 ppb |
| Sammamish Plateau Water & Sewer WA5340900 | 79,362 | 480 | 6 | 0 | 1.7 ppb |
| Covington Water District WA5341650 | 56,172 | 240 | 5 | 0 | 1.4 ppb |
| Issaquah Water System WA5336350 | 43,584 | 300 | 0 | 0 | 1 ppb |
| Cedar River Water & Sewer District WA5341800 | 28,671 | 180 | 1 | 0 | 0 ppb |
| Lake Meridian Water District WA5341900 | 24,231 | 360 | 0 | 0 | 0 ppb |
| Enumclaw Water Department WA5323600 | 23,276 | 240 | 0 | 0 | 1.5 ppb |
| Snoqualmie Water WA5381080 | 20,222 | 120 | 0 | 0 | 2.5 ppb |
| King County Water District No 90 WA5341150 | 20,100 | 180 | 0 | 0 | 1.2 ppb |
| Skyway Water & Sewer WA5338800 | 12,036 | 300 | 0 | 0 | 0 ppb |
| Ne Sammamish Sewer & Water District WA5375265 | 9,702 | 120 | 0 | 0 | 0 ppb |
| Union Hill Water Association INC WA5390260 | 8,720 | 60 | 0 | 0 | 5.8 ppb |
| North Bend City of WA5360100 | 8,710 | 120 | 0 | 0 | 0 ppb |
| Pacific City of WA5365300 | 7,925 | 60 | 1 | 0 | 0 ppb |
| Sallal Water Association INC WA5375560 | 6,600 | 240 | 0 | 0 | 0 ppb |
| Snoqualmie Pass Utility District WA5381048 | 5,832 | 60 | 0 | 0 | 5.6 ppb |
ZIP reports in King County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 98177.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.