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Washington Water Systems

2,397 community water systems in Washington, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems
2,397
Total Violations
2,705
Health Violations
295 systems
Population Served
9,236,756

Washington operates 2,397 community water systems regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act. Together these utilities serve an estimated 9,236,756 residents, each filing compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency.

Across the state, SDWIS records contain 2,705 total violations, of which 295 systems carry at least one active health-based violation, a Maximum Contaminant Level (MCL) exceedance or treatment-technique failure. That represents roughly 12% of Washington systems.

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? (60)

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

Systems with No Violations (440)

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

VANCOUVER CITY OF (373,047) SPOKANE CITY OF (343,167) BELLEVUE CITY OF (317,330) EVERETT PUBLIC WORKS DEPT. CITY OF (215,774) ALDERWOOD WATER DISTRICT (200,000) KENT WATER DEPARTMENT (166,421) REDMOND WATER SYSTEM CITY OF (163,335) LAKEHAVEN WATER AND SEWER DISTRICT (118,273) CLARK PUBLIC UTILITIES (116,876) PASCO WATER DEPARTMENT (116,342) HIGHLINE WATER DISTRICT (115,950) KENNEWICK CITY OF (114,468) Auburn City of (113,095) YAKIMA WATER DIVISION CITY OF (112,858) SKAGIT COUNTY PUD 1 JUDY RES (111,415) RENTON CITY OF (107,119) RICHLAND CITY OF (106,248) NORTHSHORE UTILITY DISTRICT (105,105) LACEY WATER DEPARTMENT (103,755) MARYSVILLE UTILITIES (88,589) SAMMAMISH PLATEAU WATER & SEWER (79,362) BREMERTON CITY OF (70,913) LYNNWOOD CITY OF (68,204) KIRKLAND CITY OF (67,107) TUMWATER CITY OF (66,373) SOOS CREEK WATER & SEWER DISTRICT (64,534) SOUTHWOOD (64,155) LAKEWOOD WATER DISTRICT (62,089) SNO PUD 1 - LAKE STEVENS (60,064) WOODINVILLE WATER DISTRICT (59,873) JBLM Lewis (58,497) SILVER LAKE WATER & SEWER DISTRICT (56,582) COVINGTON WATER DISTRICT (52,276) LONGVIEW WATER DEPARTMENT (49,111) TUKWILA WATER DEPARTMENT (45,374) WENATCHEE CITY OF (43,690) ISSAQUAH WATER SYSTEM (43,584) BONNEY LAKE WATER DEPARTMENT CITY (42,654) PUYALLUP CITY OF (39,100) KING COUNTY WATER DISTRICT #20 (38,974) FIRGROVE MUTUAL INC (36,168) NOB HILL WATER ASSOCIATION (36,026) EDMONDS CITY OF (34,023) BOTHELL WATER CITY OF (33,643) MOSES LAKE CITY OF (32,428) FIFE DEPT OF PUBLIC WORKS (32,380) SPANAWAY WATER COMPANY (31,908) CAMAS MUNICIPAL WATER SEWER SYSTEM (31,794) North City Water District (31,744) MERCER ISLAND CITY OF (30,689) +390 more

All Water Systems in Washington (2,397)

Page 3 of 48, ordered by population served.

System Population Served Violations
SUMMIT WATER & SUPPLY CO 16,109 0
KING COUNTY WATER DISTRICT #49 16,065 0
COAL CREEK UTILITY DISTRICT 15,989 0
SNOQUALMIE WATER 15,848 0
CHELAN CO PUD 1 15,840 0
PORT ORCHARD WATER DEPT 15,810 0
SUMNER CITY OF 15,530 0
FRUITLAND MUTUAL WATER COMPANY 15,313 0
KELSO CITY OF 15,097 0
GIG HARBOR WATER DEPT 14,902 0
CHENEY CITY OF 14,621 0
QUIMPER 14,500 0
SEQUIM CITY OF 14,293 0
LIBERTY LAKE SEWER & WATER DISTRICT 14,212 0
STANWOOD WATER DEPT CITY OF 13,785 0
DUPONT WATER SYSTEM CITY OF 13,141 0
JBLM McChord Field 13,115 0
SELAH CITY OF 12,515 1
BAINBRIDGE ISLAND CITY OF 12,486 0
NAVAL BASE KITSAP AT BREMERTON 12,078 2
SKYWAY WATER & SEWER 12,036 0
BEACON HILL WATER & SEWER DISTRICT 11,969 0
HOQUIAM WATER DEPARTMENT 11,456 0
CHEHALIS WATER DEPARTMENT 11,426 0
SNOHOMISH CITY OF 11,258 0
GRANDVIEW CITY OF 11,010 1
WOODLAND CITY OF 10,640 0
MANCHESTER WATER DISTRICT 10,437 0
ORTING CITY OF 10,332 0
DUVALL CITY OF 10,267 0
LWWSD - SOUTH SHORE WATER SYSTEM 10,028 0
PORT ANGELES COMPOSITE 9,879 0
MOUNTAIN VIEW-EDGEWOOD WATER CO 9,680 0
AIRWAY HEIGHTS CITY OF 9,489 0
CONSOLIDATED IRRIG DIST 19 SYSTEM 1 9,434 0
CHELAN WATER DEPT CITY OF 9,425 0
OCEAN SHORES WATER DEPT 9,347 0
LEAVENWORTH CITY OF 9,218 0
BIRCH BAY WATER & SEWER DISTRICT 9,019 0
TOPPENISH WATER DEPARTMENT 8,950 0
OTHELLO WATER DEPARTMENT 8,755 0
UNION HILL WATER ASSOCIATION INC 8,720 0
EPHRATA WATER DEPARTMENT 8,620 0
STEILACOOM TOWN OF 8,545 0
NE SAMMAMISH SEWER & WATER DISTRICT 8,516 0
QUINCY WATER DEPARTMENT CITY OF 8,415 0
YAK CO - TERRACE HEIGHTS 8,410 3
COLLEGE PLACE WATER DEPT 8,147 0
NORTH BEACH WATER 8,093 0
MILTON CITY OF 8,078 0
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Frequently Asked Questions

How many water systems are in Washington?
Washington has 2,397 community water systems tracked by the EPA, serving a combined population of 9,236,756 people.
How many water systems in Washington have health violations?
295 water systems in Washington have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 12% of all systems in the state.
What is the total number of water violations in Washington?
Washington water systems have accumulated 2,705 total violations across all 2,397 community water systems.

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

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

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