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10 Water Quality
158 public water systems serving 142,574 people.
Water Systems
158
Total Violations
31,953
Violation Rate
98.1%
PFAS Detection
20%
2 of 10 tested
Violation Composition
How 10's 31,953 violations break down by type, per EPA SDWIS classification.
Health-based (1,055) Monitoring/Reporting (30,898)
| Metric | Value | Share |
|---|---|---|
| Public water systems | 158 | — |
| Population served | 142,574 | — |
| Total violations | 31,953 | 100% |
| Health-based violations | 1,055 | 3.3% |
| Systems with violations | 155 | 98.1% |
| PFAS detection rate | 2 of 10 | 20% |
Health-based violations indicate the contaminant exceeded an EPA Maximum Contaminant Level (MCL) or treatment-technique requirement. Monitoring/reporting violations indicate procedural issues (missed tests, late reports) — not necessarily a contamination event.
Largest Water Systems
QUIL CEDA VILLAGE
TULALIP, 10 · 30,000 served
SPIRIT MOUNTAIN CASINO
GRAND RONDE, 10 · 7,800 served
TULALIP BAY WATER DIST #1
TULALIP, 10 · 5,968 served
WARM SPRINGS WATER TREATMENT PLANT
WARM SPRINGS, 10 · 3,800 served
LUMMI TRIBAL WATER DISTRICT
BELLINGHAM, 10 · 3,699 served
LEGENDS CASINO
TOPPENISH, 10 · 3,450 served
COEUR D'ALENE CASINO
WORLEY, 10 · 3,250 served
MUCKLESHOOT
AUBURN, 10 · 3,250 served
NISQUALLY-LESCHI & WEST NISQUALLY
OLYMPIA, 10 · 3,200 served
MT. VISTA - DUNGENESS GOLF COURSE
SEQUIM, 10 · 3,200 served
CREEKSIDE DEVELOPMENT
CANYONVILLE, 10 · 3,159 served
FORT HALL
FORT HALL, 10 · 2,850 served
SNOQUALMIE CASINO
SNOQUALMIE, 10 · 2,800 served
BLYN - 7 CEDARS CONSOLIDATED
SEQUIM, 10 · 2,630 served
SKOKOMISH PARK LOWER LOOP
SHELTON, 10 · 2,503 served
SWINOMISH CASINO & LODGE
LA CONNER, 10 · 2,400 served
ANGEL OF THE WINDS
ARLINGTON, 10 · 2,303 served
RIVER ROCK TOBACCO AND FUEL
ARLINGTON, 10 · 2,117 served
MISTEQUA CASINO
WELLPINIT, 10 · 2,070 served
END OF TRAIL II
OAKVILLE, 10 · 2,000 served
Most Violations
#1 STARS EARLY LEARNING CENTER YAKIMA
1,167 #2 HOH TRIBE FORKS
1,117 #3 MAKAH NEAH BAY NEAH BAY
783 #4 NISQUALLY-LESCHI & WEST NISQUALLY OLYMPIA
694 #5 WAPATO HEADSTART TOPPENISH
681 #6 FORT SIMCOE JOB CORPS CTR WHITE SWAN
678 #7 MISTEQUA CASINO WELLPINIT
674 #8 WHITE SWAN TOPPENISH
647 #9 CTUIR PWD MISSION PENDLETON
644 #10 GEORGE LANE SUQUAMISH
626 #11 WELLPINIT WELLPINIT
608 #12 QUEETS TAHOLAH
577 #13 MALOTT NESPELEM
545 #14 MARTHA BOARDMAN WELLPINIT
542 #15 SKOKOMISH SKOKOMISH NATION
532 Counties in 10
County 10061
12 systems · 44,469 served
· 1,960 violations
County 10077
35 systems · 12,671 served
· 5,257 violations
County 10009
11 systems · 9,972 served
· 1,994 violations
County 10033
2 systems · 6,050 served
· 178 violations
County 10067
5 systems · 5,920 served
· 1,750 violations
County 10019
11 systems · 5,280 served
· 3,295 violations
County 10045
4 systems · 5,189 served
· 825 violations
County 10035
11 systems · 5,183 served
· 1,392 violations
County 10073
7 systems · 4,974 served
· 1,838 violations
County 10031
3 systems · 4,805 served
· 1,849 violations
County 10057
6 systems · 4,309 served
· 239 violations
County 10011
3 systems · 3,783 served
· 910 violations
County 10065
7 systems · 3,673 served
· 2,308 violations
County 10055
1 systems · 3,250 served
· 45 violations
County 10027
9 systems · 2,948 served
· 2,623 violations
County 10041
3 systems · 2,615 served
· 51 violations
County 10047
5 systems · 2,580 served
· 269 violations
County 10069
5 systems · 1,685 served
· 1,088 violations
County 10059
4 systems · 1,623 served
· 1,093 violations
County 10130
1 systems · 1,575 served
· 368 violations
County 10063
5 systems · 1,370 served
· 1,857 violations
County 10051
1 systems · 330 served
· 66 violations
County 10049
1 systems · 198 served
· 61 violations
County 10039
4 systems · 167 served
· 205 violations
County 10025
1 systems · 155 served
· 407 violations
Drinking Water Guides
Related Environmental Data for 10
Frequently Asked Questions
How many water systems are in 10? ▼
10 has 158 public water systems serving approximately 142,574 people. These include community water systems, non-transient non-community systems, and transient non-community systems regulated under the Safe Drinking Water Act.
How many drinking water violations are in 10? ▼
10 has 31,953 total drinking water violations on record, with 1,055 classified as health-based violations. 98.1% of water systems in the state have at least one violation.
Has PFAS been found in 10 drinking water? ▼
Of 10 water systems tested for PFAS in 10, 2 had PFAS detected — a 20% detection rate. PFAS are persistent "forever chemicals" that do not break down in the environment.
What is the violation rate for 10 water systems? ▼
10's violation rate is 98.1%. This measures the percentage of public water systems that have at least one recorded violation in the EPA SDWIS database, including both health-based and monitoring/reporting violations.
Where does this 10 water data come from? ▼
All drinking water data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS is the federal database that tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources & Methodology
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.
Read our methodology — how this data is sourced, computed, and verified.
Related
Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial
