King County, Washington Water Systems

King County, Washington

295 community water systems on record — 156 active, 139 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Washington’s official records. Always confirm current status with Washington before making decisions based on this information.

Community water systems in King County, Washington

System name	Mailing city	Population served	Status
SEATTLE PUBLIC UTILITIES	Seattle	1,161,961	Active
BELLEVUE CITY OF	Bellevue	321,349	Active
KENT WATER DEPARTMENT	Kent	166,421	Active
REDMOND WATER SYSTEM CITY OF	Redmond	163,335	Active
LAKEHAVEN WATER AND SEWER DISTRICT	FEDERAL WAY	148,809	Active
RENTON CITY OF	Renton	108,091	Active
Auburn City of	Auburn	107,655	Active
HIGHLINE WATER DISTRICT	Kent	100,170	Active
NORTHSHORE UTILITY DISTRICT	Kenmore	99,789	Active
SAMMAMISH PLATEAU WATER & SEWER	Sammamish	79,362	Active
SOOS CREEK WATER & SEWER DISTRICT	Renton	74,172	Active
KIRKLAND CITY OF	Kirkland	69,243	Active
WOODINVILLE WATER DISTRICT	Woodinville	66,699	Active
COVINGTON WATER DISTRICT	Kent	56,172	Active
KING COUNTY WATER DISTRICT #20	Seattle	48,469	Active
ISSAQUAH WATER SYSTEM	ISSAQUAH	43,584	Active
TUKWILA WATER DEPARTMENT	Tukwila	36,298	Active
BOTHELL WATER CITY OF	Bothell	33,643	Active
North City Water District	Shoreline	32,847	Active
MERCER ISLAND CITY OF	Mercer Island	31,057	Active
CEDAR RIVER WATER & SEWER DISTRICT	Maple Valley	28,671	Active
Lake Meridian Water District	Kent	24,231	Active
KING COUNTY WATER DISTRICT #49	Burien	23,492	Active
ENUMCLAW WATER DEPARTMENT	Enumclaw	23,276	Active
KING COUNTY WATER DISTRICT #125	SEATTLE	21,904	Active
SNOQUALMIE WATER	SNOQUALIME	20,222	Active
KING COUNTY WATER DISTRICT NO 90	Renton	20,100	Active
ROSE HILL WATER DISTRICT	KIRKLAND	18,300	Inactive
COAL CREEK UTILITY DISTRICT	Newcastle	15,989	Active
SKYWAY WATER & SEWER	Seattle	12,036	Active
DUVALL CITY OF	DUVALL	11,050	Active
NE SAMMAMISH SEWER & WATER DISTRICT	SAMMAMISH	9,702	Active
UNION HILL WATER ASSOCIATION INC	Redmond	8,720	Active
NORTH BEND CITY OF	North Bend	8,710	Active
PACIFIC CITY OF	Othello	7,925	Active
SALLAL WATER ASSOCIATION INC	North Bend	6,600	Active
BLACK DIAMOND WATER DEPT	BLACK DIAMOND	6,407	Active
SNOQUALMIE PASS UTILITY DISTRICT	Snoqualmie Pass	5,832	Active
KCWD #56	REDONDO	5,800	Inactive
KING COUNTY WATER DISTRICT #54	Kent	5,373	Active
WATER DISTRICT 19	Vashon	5,335	Active
KING COUNTY WATER DISTRICT #45	Seattle	4,398	Inactive
SKYWAY WATER & SEWER DISTRICT	SEATTLE	4,000	Inactive
KING COUNTY WATER DISTRICT 119	Duvall	3,800	Active
ALGONA WATER DEPT	Algona	3,300	Active
AMES LAKE WATER ASSOC INC	Redmond	3,224	Active
LAKE FOREST PARK WATER DISTRICT	Lake Forest Park	3,171	Active
FALL CITY WATER DIST. #127	Fall City	2,987	Active
ALEXANDERS RESORT	SNOQUALMIE	2,878	Inactive
CARNATION WATER SYSTEM CITY OF	Mt Vernon	2,400	Active
CHEROKEE BAY COMMUNITY CLUB INC	Port Orchard	2,400	Active
KCWD #4	BURIEN	2,150	Inactive
KCWD #77	SEATTLE	2,135	Inactive
MIRRORMONT	Tacoma	2,083	Active
HEIGHTS WATER	Vashon	2,051	Active
LAKERIDGE WATER DISTRICT	SEATTLE	2,000	Inactive
NORMANDY PARK WATER COMPANY	SEATTLE	1,985	Inactive
WILDERNESS RIM ASSOCIATION	Falls City	1,867	Active
RIVER BEND HOA	Snoqualmie	1,603	Active
SHOREWOOD APARTMENTS	MERCER ISLAND	1,600	Inactive
KING COUNTY WATER DISTRICT #85	SEAHURST	1,430	Inactive
KCWD #121	ISSAQUAH	1,360	Inactive
ALPENTAL SKI AREA	CLE ELUM	1,288	Inactive
CASCADE VIEW WATER DIST.	REDMOND	1,245	Inactive
TUKWILA, CITY OF DUWAMISH	TUKWILA	1,200	Inactive
DOCKTON WATER ASSOCIATION	VASHON	992	Active
BURTON WATER COOPERATIVE	Vashon	964	Active
KCWD #69, SKYWAY	SEATTLE	930	Inactive
PRESTON INDUSTRIAL PARK WATER ASSN	Port Orchard	930	Active
ENUMCLAW GOLF COURSE	ENUMCLAW	829	Inactive
EASTHILL COMMUNITY WELL CO	KENT	800	Inactive
FIRCREST SCHOOL / DSHS	SEATTLE	800	Inactive
VASHON ISLAND WATER & ROAD ASS	BELLEVUE	800	Inactive
MERCER CREST WATER ASSOC	MERCER IS	795	Inactive
Grandview Condominiums	Port Orchard	679	Active
KCWD #1	BELLEVUE	615	Inactive
WESTSIDE WATER ASSN	Vashion Island	562	Active
KCWD #88	SEATTLE	540	Inactive
KING COUNTY WATER DISTRICT #1-YARRO	YARROW POINT	517	Inactive
OVERDALE WATER ASSOCIATION	Issaquah	476	Inactive
SUGARLOAF WATER SYSTEM	Kent	468	Active
MAPLEWOOD ADDITION WATER COOP	Renton	435	Active
SNOQUALMIE FALLS GOLF	FALL CITY	433	Inactive
ECHO GLEN CHILDRENS CENTER	Snoqualmie	430	Active
LAKE MARGARET WATER SYSTEM	Carnation	406	Active
LAKE RETREAT CAMP & CONF CENTER	RAVENSDALE	404	Active
Gold Beach Water Company	Vashon	390	Active
RAVENSDALE WATER SUPPLY	Renton	389	Active
COLLEGE PLACE MOBILE HOME PARK	AUBURN	375	Inactive
KING COUNTY WATER DISTRICT #94	MAPLE VALLEY	375	Inactive
KING COUNTY WATER DISTRICT #17	BELLEVUE	350	Inactive
SKYLARK VILLAGE MHP	AUBURN	350	Inactive
WESLEY GARDENS	DES MOINES	350	Inactive
BEAUX ARTS WATER DEPARTMENT	BEAUX ARTS	345	Active
RIVERBEND MOBILE HOME PARK	PORT ORCHARD	343	Active
SKYKOMISH WATER DEPT	Skykomish	324	Active
KCWD #87, THOMAS	KENT	322	Inactive
MASONIC RETIREMENT CENTER	SEATTLE	292	Inactive
SKYLARK VILLAGE	AUBURN	282	Inactive
WILSONS COTTAGES W D	RENTON	280	Inactive
Highlands Utility District	Shoreline	275	Active
FOOTHILLS WATER ASSOCIATION	Port Orchard	271	Active
WALCZAK 620	Lacey	256	Active
AVON VILLA TRAILER PARK	REDMOND	255	Inactive
REDMOND MOBILE MANOR	REDMOND	250	Inactive
SPRING GLEN ASSOCIATION	Fall City	245	Active
KING COUNTY WATER DISTRICT #123	Port Orchard	242	Active
WHITE RIVER WATER CO	ENUMCLAW	240	Inactive
Y BAR S WATER COMPANY INC	Seattle	240	Inactive
MAURY MUTUAL WATER CO	Vashon	233	Active
AVONDALE PARK WATER SYSTEM	REDMOND	230	Inactive
CRISTALINA	Tacoma	225	Active
DORRE DON WATER SYSTEM	MAPLE VALLEY	225	Inactive
L MCDONALD COMM ASSN	RENTON	217	Inactive
FOUR LAKES	Lake Forest Park	212	Active
SOUTH AUBURN WATER ASSOCIATION	Black Diamond	212	Active
CUMBERLAND COOP WATER SYSTEM	Port Orchard	210	Active
KING COUNTY WATER DISTRICT #57	SEATTLE	210	Inactive
SELLECK WATER SUPPLY	RAVENSDALE	207	Inactive
Auburn Park Community LLC	Port Orchard	202	Active
MOUNT SI MOBILE HOME ESTATES	North Bend	200	Active
REDMOND MHP	REDMOND	195	Inactive
CRESTVIEW WATER SUPPLY	KENT	175	Inactive
LOCLOMAN SUBDIVISION	Kent	174	Active
DAWNBREAKER WATER ASSOCIATION	Port Orchard	168	Active
PLAT OF HEATHERCREST	SEATTLE	168	Inactive
KRAIN WATER SUPPLY	ENUMCLAW	161	Inactive
MOBILE HOME WONDERLAND	RENTON	160	Inactive
DERBYSHIRE SCENIC ACRES	Port Orchard	156	Active
LAKE MERIDIAN ESTATES (MHP)	Kent	154	Active
EVERGREEN WATER & IMPROVEMENT ASSN	Port Orchard	150	Active
FOUR CREEKS RANCH WATER SYSTEM	Port Orchard	150	Active
UPPER PRESTON WATER ASSN	Falls City	150	Active
CRESTVIEW WEST WATER SYSTEM	KENT	147	Active
WEBSTER LAKE ESTATES WATER SYSTEM	RENTON	147	Inactive
INGLEWOOD PARK WATER CO.	KIRKLAND	145	Inactive
LAKE TUCK	Tacoma	143	Active
CHERRY CREEK	Sun Valley	138	Active
DIAMOND SPRINGS WATER ASSOCIATION	Port Orchard	138	Active
MARIANI WATER SYSTEM INC	Black Diamond	138	Active
TWENTY-THREE 800 TIGER MOUNTAIN	Port Orchard	129	Active
THE MEADOWS WATER SYSTEM LLC	KIRKLAND	127	Active
Valley View Mobile Park LLC	Port Orchard	126	Active
CEDAR GROVE MOBILE HOME PARK	Covington	122	Inactive
FORT MUCKLESHOOT TRAILER PARK	AUBURN	120	Inactive
MERIDIAN MEADOWS	KENT	117	Inactive
TRAILS END	Port Orchard	117	Active
TERRAWOOD WATER	MAPLE VALLEY	114	Inactive
EDGEHILL WATER ASSN	Maple Valley	109	Active
RIVERWOOD PARK COMMUNITY CLUB	Port Orchard	109	Active
WOODLAND HEIGHTS	Snohomish	108	Active
BEULAH PARK COMMUNITY	Port Orchard	106	Active
CEDAR MOUNTAIN HOMEOWNERS ASSOC	Port Orchard	106	Active
RUMBOLZ SUNSET WATER SYSTEM	Snoqualmie	106	Active
ECHO GLEN WATER SYSTEM	SILVERDALE	105	Active
PLEMMONS WATER SUPPLY	KENT	105	Inactive
MARTINS MOBILE VILLA	REDMOND	102	Inactive
SPRING GLEN MOBILE HOME PARK	Mercer Island	96	Active
KING COUNTY WATER DISTRICT #117	Port Orchard	95	Active
MOUNTAIN VIEW WATER DISTRICT INC	Kent	91	Active
CEDAR GLEN ESTATES	ENUMCLAW	90	Inactive
INDEPENDENT WATER CO., INC.	RENTON	90	Inactive
KCWD #78	RENTON	90	Inactive
Lake Alice Water Association	Fall City	90	Active
NOB HILL WATER COMPANY	MAPLE VALLEY	90	Inactive
RAKWANNA PARK WATER SYS INC	WOODINVILLE	90	Active
DILWORTH PT COMMUNITY	VASHON	88	Inactive
MONOLDON WATER SYSTEM	ISSAQUAH	86	Inactive
ORCHARD GROVE	Port Orchard	86	Active
HAZELWOOD HEIGHTS	Auburn	85	Active
SUNNYSLOPE MUTUAL WATER SYSTEM	Vashion Island	85	Active
WEBER POINT	REDMOND	84	Inactive
ERICKSONS SUBURBAN ESTATES	KENT	83	Inactive
ISSAQUAH VALLEY WATER ASSN #1	Issaquah	80	Active
CRESTVIEW TRACTS #3	Auburn	77	Active
REMOLIF ADDITION	—	76	Active
LAKE WILDERNESS SHORE ACRES ESTATE	Renton	75	Active
STARCREST ADDITION	KENT	75	Inactive
LUANA WATER ASSN.	Port Orchard	71	Active
QUARTERMASTER HEIGHTS WATER ASSN	Vashon	70	Active
SANDY SHORES WATER ASSOCIATION	DOCKTON	70	Inactive
WELCHS WATER ASSOCIATION	Port Orchard	69	Active
SAMMAMISH VIEW PARK	REDMOND	64	Inactive
Newaukum Water System	Port Orchard	62	Active
STONE CREEK ESTATES WATER ASSN.	Kent	62	Active
WOMISH, INC	VASHON	62	Inactive
ROCKY ACRES WATER SYSTEM	Port Orchard	61	Active
KANGLEY	RAVENSDALE	60	Inactive
PANTHER L COMM SUPP	OLYMPIA	60	Inactive
WILDERNESS VILLAGE	MAPLE VALLEY	60	Inactive
FALL CITY WATER DIST. (PLUM CREEK)	Fall City	59	Active
ALPINE WATER ASSOCIATION	Falls City	58	Active
FALL CITY WATER DIST.(SPRING HILL)	Fall City	57	Active
MAPLE VISTA	Lake Forest Park	57	Active
PANTHER LAKE COMMUNITY SOUTH	KENT	57	Inactive
AQUA VISTA ESTATES	KENT	56	Inactive
85 Acres	Sun Valley	55	Active
CHAMONIX VILLAGE	Baring	53	Active
SHAWNEE WATER SYSTEM	VASHON	53	Inactive
ELDERWOOD WATER ASSOCIATION	Port Orchard	52	Active

Showing the 200 largest of 295 systems on record, by population served. Browse by county above for the full list — every system has its own page, and all of them are in the sitemap.