Washington Drinking Water Compliance Records
2,311 water systems serving 9,564,273 people. 104,804 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
1,190
51%
B
698
30%
C
348
15%
D
50
2%
F
25
1%
2,311
Water Systems
9,564,273
Population Served
104,804
Historical Records
5,802
Health-Based (All Years)
Systems With the Most Recent EPA Records
MARBLE WATER SYSTEM
94 served2,144 historical records1,240 recent
D
TRAILS WEST SUBDIVISION
27 served1,112 historical records796 recent
C
SALKUM WATER SUPPLY
103 served341 historical records317 recent
D
WEST DEER LAKE #1
24 served171 historical records171 recent
C
TRAILS END WATER DISTRICT
211 served330 historical records117 recent
C
TWIN PINES MOBILE HOME PARK
25 served273 historical records105 recent
C
ROCKAWAY BEACH COMMUNITY ASSN
35 served101 historical records101 recent
C
Sunwood Graham
315 served86 historical records80 recent
C
COLLEGE PLACE WATER DEPT
8,147 served112 historical records75 recent
C
Great Basin Water Burbank
656 served347 historical records72 recent
D
Large Systems With No Recent Records
SEATTLE PUBLIC UTILITIES
1,161,961 served4 historical records
A
TACOMA WATER DIVISION CITY OF
446,170 served17 historical records
A
VANCOUVER CITY OF
373,047 served48 historical records
A
SPOKANE CITY OF
346,138 served1 historical record
A
BELLEVUE CITY OF
321,349 served5 historical records
A
ALDERWOOD WATER DISTRICT
245,715 served5 historical records
A
EVERETT PUBLIC WORKS DEPT. CITY OF
215,774 served4 historical records
A
REDMOND WATER SYSTEM CITY OF
163,335 served2 historical records
A
LAKEHAVEN WATER AND SEWER DISTRICT
148,809 served47 historical records
A
BELLINGHAM-WATER DIVISION CITY OF
141,127 served1 historical record
A
Largest Water Systems in Washington
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| SEATTLE PUBLIC UTILITIES | A | 1,161,961 | 4 |
| TACOMA WATER DIVISION CITY OF | A | 446,170 | 17 |
| VANCOUVER CITY OF | A | 373,047 | 48 |
| SPOKANE CITY OF | A | 346,138 | 1 |
| BELLEVUE CITY OF | A | 321,349 | 5 |
| ALDERWOOD WATER DISTRICT | A | 245,715 | 5 |
| EVERETT PUBLIC WORKS DEPT. CITY OF | A | 215,774 | 4 |
| KENT WATER DEPARTMENT | B | 166,421 | 32 |
| REDMOND WATER SYSTEM CITY OF | A | 163,335 | 2 |
| CLARK PUBLIC UTILITIES | B | 153,526 | 42 |
| LAKEHAVEN WATER AND SEWER DISTRICT | A | 148,809 | 47 |
| BELLINGHAM-WATER DIVISION CITY OF | A | 141,127 | 1 |
| OLYMPIA CITY OF | B | 126,966 | 28 |
| KENNEWICK CITY OF | B | 118,164 | 6 |
| PASCO WATER DEPARTMENT | C | 115,102 | 49 |
| YAKIMA WATER DIVISION CITY OF | B | 112,858 | 52 |
| SKAGIT COUNTY PUD 1 JUDY RES | B | 111,415 | 11 |
| RENTON CITY OF | A | 108,091 | 14 |
| Auburn City of | B | 107,655 | 26 |
| RICHLAND CITY OF | A | 106,499 | 39 |
Contaminants in Washington
Lead in WashingtonArsenic in WashingtonNitrate in WashingtonFluoride in WashingtonPFOS in WashingtonPFOA in WashingtonTHMs in WashingtonHAA5 in Washington
Cities in Washington
Seattle(6)TACOMA(2)Spokane(31)Vancouver(10)Kent(10)Bellevue(1)Lynnwood(2)Everett(10)Renton(6)Tacoma(127)Yakima(88)Redmond(3)Bellingham(16)VANCOUVER(2)FEDERAL WAY(1)Puyallup(19)Mount Vernon(9)Lacey(76)OLYMPIA(6)Kennewick(14)Pasco(23)Auburn(8)Richland(2)Kenmore(1)Bothell(3)Bremerton(4)Marysville(1)LAKEWOOD(1)Sammamish(2)Port Orchard(269)Kirkland(3)Silverdale(5)Woodinville(2)Poulsbo(35)Wenatchee(19)Longview(2)Pullman(2)Tumwater(4)Edmonds(2)Walla Walla(14)Snohomish(8)Buckley(4)ISSAQUAH(1)Joint Base Lewis-McChord(2)Tukwila(1)Moses Lake(29)Spanaway(5)Arlington(41)Cheney(3)Port Townsend(10)Shoreline(2)Spokane Valley(4)Camas(1)Mukilteo(2)Port Angeles(5)Mercer Island(2)Greenacres(2)Lynden(30)Battle Ground(2)FIFE(1)Maple Valley(6)Centralia(2)Oak Harbor(25)Monroe(9)Mead(2)East Wenatchee(2)Mountlake Terrace(1)Gig Harbor(31)Stanwood(8)Coupeville(98)Burien(1)Enumclaw(2)Aberdeen(3)SEQUIM(35)West Richland(4)Clarkston(1)SEATTLE(1)Ellensburg(7)Washougal(1)Ridgefield(1)Ferndale(15)Yelm(5)SNOQUALIME(1)Othello(18)SHELTON(5)PORT ORCHARD(9)Loon Lake(20)Shelton(50)Sunnyside(1)Quincy(12)NAS Whidbey Island(1)Sumner(1)Kelso(6)Montesano(8)Newcastle(1)Mt Vernon(52)KELSO(1)North Bend(5)PUYALLUP(1)Liberty Lake(1)