County · Washington
Snohomish County, Washington: drinking water records
This overview covers 27 ZIP codes and 127 community water systems in Snohomish County. It also stands in for 4 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 |
|---|---|---|---|---|---|
| Alderwood Water District WA5301300 | 245,715 | 118 | 0 | 0 | 28 ppb |
| Everett Public Works Dept. City of WA5324050 | 215,774 | 240 | 0 | 0 | 3.5 ppb |
| Marysville Utilities WA5351900 | 88,582 | 480 | 0 | 0 | 2 ppb |
| Sno PUD 1 - Lake Stevens WA5380907 | 67,710 | 180 | 0 | 0 | 3.2 ppb |
| Arlington City of WA5302950 | 29,508 | 297 | 1 | 0 | 0 ppb |
| Cross Valley Water District WA5316270 | 24,695 | 420 | 3 | 0 | 3.1 ppb |
| Olympic View Water & Sewer District WA5363600 | 17,784 | 240 | 0 | 0 | 1.7 ppb |
| Stanwood Water Dept City of WA5383650 | 17,586 | 120 | 0 | 0 | 1.6 ppb |
| Snohomish City of WA5380915 | 16,367 | 240 | 0 | 0 | 0.8 ppb |
| Sultan Water Department WA5384770 | 8,424 | 180 | 0 | 0 | 1.3 ppb |
| Tulalip Bay Water Dist #1 105300003 | 5,968 | 120 | 0 | 0 | 0.4 ppb |
| Seven Lakes Water Association WA5377660 | 5,823 | 240 | 0 | 0 | 1 ppb |
| Granite Falls City of WA5329050 | 5,349 | 120 | 0 | 0 | 3 ppb |
| Gold Bar City of WA5328300 | 2,745 | 120 | 0 | 0 | 1.2 ppb |
| Port Susan Camp Club #3 105300092 | 1,000 | 0 | 0 | 2 | 0 ppb |
| Lake Alyson WA5350691 | 463 | 0 | 0 | 1 | 2.6 ppb |
| Mckees Beach Assoc WA5324190 | 290 | 0 | 0 | 2 | 0 ppb |
| Thunderbird Terrace Water System WA5305067 | 75 | 0 | 0 | 1 | 0.6 ppb |
| Tulare Beach Association WA5389650 | 54 | 0 | 0 | 1 | 1.6 ppb |
| Lynnwood City of WA5349270 | 68,204 | 119 | 0 | 0 | not reported |
| Silver Lake Water & Sewer District WA5379250 | 65,033 | 115 | 0 | 0 | not reported |
| Edmonds City of WA5322500 | 34,065 | 120 | 0 | 0 | not reported |
| Mukilteo Water & Wastewater Distr WA5357550 | 31,437 | 360 | 0 | 0 | not reported |
| Mountlake Terrace City of WA5357250 | 26,402 | 119 | 0 | 0 | not reported |
| Monroe Water System WA5355820 | 23,467 | 120 | 0 | 0 | not reported |
ZIP reports in Snohomish 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: 98012, 98021, 98272, 98290.
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.