PlainEnviro

Washington Water Systems

2,410 community water systems in Washington, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems
2,410
Health-Based Violation Records
2,879
Health Violations
304 systems
Population Served
9,610,596

Washington community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.

Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.

Which water systems have violations? (63)

# System Name Violations Health
1 WALLA WALLA WATER DIVISION Walla Walla 105 Yes
2 MAKAH NEAH BAY Neah Bay 45 Yes
3 BC WATER CO Kennewick 36 Yes
4 BADGER MOUNTAIN IRRIGATION DISTRICT Kennewick 24 Yes
5 ROLLING HILLS-GLENCAIRN Oak Harbor 19 Yes
6 SURFSIDE HOMEOWNERS Ocean Park 17 Yes
7 LONG BEACH WATER DEPARTMENT Long Beach 12 Yes
8 BOSTON HARBOR Olympia 11 Yes
9 WHITE SWAN Toppenish 11 Yes
10 WESTPORT WATER DEPARTMENT Westport 10 Yes
11 WHITE SALMON CITY OF White Salmon 10 Yes
12 TACOMA WATER DIVISION CITY OF Tacoma 9 Yes
13 PE ELL TOWN OF Pe Ell 9 Yes
14 SEATTLE PUBLIC UTILITIES Seattle 4 Yes
15 KING COUNTY WATER DISTRICT #54 Kent 4 Yes
16 Mattawa City of Mattawa 4 Yes
17 MILLWOOD CITY OF Spokane 4 Yes
18 TAHOLAH Taholah 4 Yes
19 SQUAXIN CONSOLIDATED Shelton 4 Yes
20 VADER-ENCHANTED VALLEY Chehalis 4 Yes
21 LYNDEN WATER DEPARTMENT Lynden 3 Yes
22 NAVAL BASE KITSAP AT BREMERTON Silverdale 3 Yes
23 YAK CO - TERRACE HEIGHTS Yakima 3 Yes
24 WATER DISTRICT 19 Vashon 3 Yes
25 Raymond Water Department Raymond 3 Yes
26 EASTSOUND WATER USERS ASSOCIATION Eastsound 3 Yes
27 ZILLAH CITY OF Zillah 3 Yes
28 CRESCENT WATER ASSN Joyce 3 Yes
29 PORT GAMBLE SKLALLAM Kingston 3 Yes
30 Monse-Riggan Camp Brewster 3 Yes
31 DIAMOND POINT Freeland 3 Yes
32 SELAH CITY OF Selah 2 Yes
33 TULALIP BAY WATER DIST #1 Tulalip 2 Yes
34 YACOLT Vancouver 2 Yes
35 JACKSON PARK NAVAL HOSPITAL Silverdale 2 Yes
36 Basin City Water Sewer District Mesa 2 Yes
37 CHELAN CO PUD1 - Peshastin 2 Yes
38 Pelican Point By Cascadia LLC Yakima 2 Yes
39 CONCRETE UTILITIES Mt Vernon 2 Yes
40 PORT SUSAN CAMP CLUB #3 Stanwood 2 Yes
41 TRIBAL COMPLEX Toppenish 2 Yes
42 SHOALWATER BAY Tokeland 2 Yes
43 BELLINGHAM-WATER DIVISION CITY OF Bellingham 1 Yes
44 OLYMPIA CITY OF Olympia 1 Yes
45 PORT TOWNSEND CITY OF Port Townsend 1 Yes
46 GRANDVIEW CITY OF Grandview 1 Yes
47 CONNELL CITY OF Connell 1 Yes
48 WARDEN CITY OF Warden 1 Yes
49 CRYSTAL MOUNTAIN INC Raymond 1 Yes
50 LUMMI TRIBAL WATER DISTRICT Bellingham 1 Yes
51 FRIDAY HARBOR TOWN OF Friday Harbor 1 Yes
52 NISQUALLY-LESCHI & WEST NISQUALLY Olympia 1 Yes
53 WESTERN STATE HOSPITAL Port Orchard 1 Yes
54 CLE ELUM WATER DEPARTMENT Cle Elum 1 Yes
55 ROCHE HARBOR WATER SYSTEM INC Friday Harbor 1 Yes
56 GRAND COULEE WATER DEPT CITY OF Grand Coulee 1 Yes
57 ROSARIO Eastsound 1 Yes
58 LANGLEY CITY OF Langley 1 Yes
59 WEILER-MARTIN TRACTS WATER ASSN Quincy 1 Yes
60 MEADOWMEER Port Orchard 1 Yes
61 SCATCHET HEAD WATER DISTRICT Coupeville 1 Yes
62 LAKE OF THE WOODS COMMUNITY CLUB Gig Harbor 1 Yes
63 Lewis Co Water Sewer Dist #6 Mossyrock 1 Yes

Systems with No Violations (437)

437 water systems in Washington have zero recorded violations. Showing the 50 largest by population served.

VANCOUVER CITY OF (373,047) SPOKANE CITY OF (346,138) BELLEVUE CITY OF (321,349) ALDERWOOD WATER DISTRICT (245,715) EVERETT PUBLIC WORKS DEPT. CITY OF (215,774) KENT WATER DEPARTMENT (166,421) REDMOND WATER SYSTEM CITY OF (163,335) CLARK PUBLIC UTILITIES (153,526) LAKEHAVEN WATER AND SEWER DISTRICT (148,809) KENNEWICK CITY OF (118,164) PASCO WATER DEPARTMENT (115,102) YAKIMA WATER DIVISION CITY OF (112,858) SKAGIT COUNTY PUD 1 JUDY RES (111,415) RENTON CITY OF (108,091) Auburn City of (107,655) RICHLAND CITY OF (106,499) LACEY WATER DEPARTMENT (105,178) HIGHLINE WATER DISTRICT (100,170) NORTHSHORE UTILITY DISTRICT (99,789) PUYALLUP CITY OF (94,520) MARYSVILLE UTILITIES (88,582) LAKEWOOD WATER DISTRICT (82,425) SAMMAMISH PLATEAU WATER & SEWER (79,362) SOOS CREEK WATER & SEWER DISTRICT (74,172) BREMERTON CITY OF (72,951) KIRKLAND CITY OF (69,243) LYNNWOOD CITY OF (68,204) SNO PUD 1 - LAKE STEVENS (67,710) WOODINVILLE WATER DISTRICT (66,699) SILVER LAKE WATER & SEWER DISTRICT (65,033) SOUTHWOOD (64,155) LONGVIEW WATER DEPARTMENT (57,617) COVINGTON WATER DISTRICT (56,172) TUMWATER CITY OF (51,802) KING COUNTY WATER DISTRICT #20 (48,469) WENATCHEE CITY OF (43,690) ISSAQUAH WATER SYSTEM (43,584) BONNEY LAKE WATER DEPARTMENT CITY (43,371) NOB HILL WATER ASSOCIATION (38,050) TUKWILA WATER DEPARTMENT (36,298) FIRGROVE MUTUAL INC (36,168) JBLM Lewis (35,414) SILVERDALE WATER DIST 16 (35,163) SPANAWAY WATER COMPANY (34,506) EDMONDS CITY OF (34,065) PARKLAND LIGHT & WATER COMPANY (33,775) BOTHELL WATER CITY OF (33,643) North City Water District (32,847) MOSES LAKE CITY OF (32,428) CAMAS MUNICIPAL WATER SEWER SYSTEM (31,794) +387 more

All Water Systems in Washington (2,410)

Page 1 of 49, ordered by population served.

System Population Served Violations
SEATTLE PUBLIC UTILITIES 1,161,961 4
TACOMA WATER DIVISION CITY OF 446,170 9
VANCOUVER CITY OF 373,047 0
SPOKANE CITY OF 346,138 0
BELLEVUE CITY OF 321,349 0
ALDERWOOD WATER DISTRICT 245,715 0
EVERETT PUBLIC WORKS DEPT. CITY OF 215,774 0
KENT WATER DEPARTMENT 166,421 0
REDMOND WATER SYSTEM CITY OF 163,335 0
CLARK PUBLIC UTILITIES 153,526 0
LAKEHAVEN WATER AND SEWER DISTRICT 148,809 0
BELLINGHAM-WATER DIVISION CITY OF 141,127 1
OLYMPIA CITY OF 126,966 1
KENNEWICK CITY OF 118,164 0
PASCO WATER DEPARTMENT 115,102 0
YAKIMA WATER DIVISION CITY OF 112,858 0
SKAGIT COUNTY PUD 1 JUDY RES 111,415 0
RENTON CITY OF 108,091 0
Auburn City of 107,655 0
RICHLAND CITY OF 106,499 0
LACEY WATER DEPARTMENT 105,178 0
HIGHLINE WATER DISTRICT 100,170 0
NORTHSHORE UTILITY DISTRICT 99,789 0
PUYALLUP CITY OF 94,520 0
MARYSVILLE UTILITIES 88,582 0
LAKEWOOD WATER DISTRICT 82,425 0
SAMMAMISH PLATEAU WATER & SEWER 79,362 0
SOOS CREEK WATER & SEWER DISTRICT 74,172 0
BREMERTON CITY OF 72,951 0
KIRKLAND CITY OF 69,243 0
LYNNWOOD CITY OF 68,204 0
SNO PUD 1 - LAKE STEVENS 67,710 0
WOODINVILLE WATER DISTRICT 66,699 0
SILVER LAKE WATER & SEWER DISTRICT 65,033 0
SOUTHWOOD 64,155 0
LONGVIEW WATER DEPARTMENT 57,617 0
COVINGTON WATER DISTRICT 56,172 0
TUMWATER CITY OF 51,802 0
KING COUNTY WATER DISTRICT #20 48,469 0
WENATCHEE CITY OF 43,690 0
ISSAQUAH WATER SYSTEM 43,584 0
BONNEY LAKE WATER DEPARTMENT CITY 43,371 0
WALLA WALLA WATER DIVISION 42,959 105
NOB HILL WATER ASSOCIATION 38,050 0
TUKWILA WATER DEPARTMENT 36,298 0
FIRGROVE MUTUAL INC 36,168 0
JBLM Lewis 35,414 0
SILVERDALE WATER DIST 16 35,163 0
SPANAWAY WATER COMPANY 34,506 0
EDMONDS CITY OF 34,065 0
Page 1 of 49 Next →

Frequently Asked Questions

How many water systems are in Washington?
Washington has 2,410 community water systems tracked by the EPA, serving a combined population of 9,610,596 people.
How many water systems in Washington have health violations?
304 water systems in Washington have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 13% of all systems in the state.
How many health-based violation records are in this extract for Washington?
PlainEnviro's health-based EPA SDWIS extract contains 2,879 records joined to 2,410 active community water systems in Washington. Monitoring and reporting records are not included.

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About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

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