| Public water system | Population served |
|---|---|
| SEATTLE PUBLIC UTILITIES | 1,161,961 |
| TACOMA WATER DIVISION CITY OF | 446,170 |
| 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 |
| BELLINGHAM-WATER DIVISION CITY OF | 141,127 |
| OLYMPIA CITY OF | 126,966 |
| 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 |
| 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 |
| WALLA WALLA WATER DIVISION | 42,959 |
| TUKWILA WATER DEPARTMENT | 36,298 |
| JBLM Lewis | 35,414 |
| SILVERDALE WATER DIST 16 | 35,163 |
| EDMONDS CITY OF | 34,065 |
| 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 |
| Mukilteo Water & Wastewater Distr | 31,437 |
| PULLMAN WATER DEPARTMENT CITY OF | 31,315 |
| MERCER ISLAND CITY OF | 31,057 |
| BATTLE GROUND WATER DEPT CITY OF | 30,237 |
| ARLINGTON CITY OF | 29,508 |
| FIFE DEPT OF PUBLIC WORKS | 29,091 |
| West Sound Utility District #1 | 28,930 |
| CEDAR RIVER WATER & SEWER DISTRICT | 28,671 |
| CENTRALIA PUBLIC WORKS - WATER | 28,164 |
| PORT ANGELES CITY OF | 28,067 |
| WHITWORTH WATER DISTRICT 2 | 26,883 |
| EAST WENATCHEE WATER DISTRICT | 26,519 |
| MOUNTLAKE TERRACE CITY OF | 26,402 |
| ANACORTES CITY OF | 25,109 |
| CROSS VALLEY WATER DISTRICT | 24,695 |
| VERA WATER & POWER | 24,692 |
| NORTH PERRY AVE WATER DISTRICT | 24,402 |
| Lake Meridian Water District | 24,231 |
| OAK HARBOR CITY OF | 23,675 |
| KING COUNTY WATER DISTRICT #49 | 23,492 |
| MONROE WATER SYSTEM | 23,467 |
| ENUMCLAW WATER DEPARTMENT | 23,276 |
| ABERDEEN CITY OF | 22,867 |
| PUD #1 OF ASOTIN COUNTY | 21,930 |
| KING COUNTY WATER DISTRICT #125 | 21,904 |
| WASHINGTON STATE UNIVERSITY | 21,506 |
| WASHOUGAL CITY OF | 21,441 |
| WEST RICHLAND CITY OF | 21,231 |
| RIDGEFIELD PUBLIC WORKS | 21,225 |
| CONSOLIDATED IRRIG DIST 19 SYSTEM 2 | 21,220 |
| ELLENSBURG WATER DEPT | 20,900 |
| SNOQUALMIE WATER | 20,222 |
| KING COUNTY WATER DISTRICT NO 90 | 20,100 |
| LYNDEN WATER DEPARTMENT | 20,062 |
| FERNDALE | 19,305 |
| SPO CO WATER DIST 3 SYS 1 | 19,035 |
| POULSBO CITY OF | 18,400 |
| OLYMPIC VIEW WATER & SEWER DISTRICT | 17,784 |
| STANWOOD WATER DEPT CITY OF | 17,586 |
| YELM CITY OF | 17,355 |
| SUNNYSIDE CITY OF | 17,194 |
| EASTERN WASHINGTON UNIVERSITY | 17,108 |
| PORT TOWNSEND CITY OF | 17,053 |
| CHENEY CITY OF | 16,954 |
| NAVAL BASE KITSAP AT BANGOR | 16,828 |
| NAVAL AIR STATION/WHIDBEY ISLAND | 16,595 |
| GIG HARBOR WATER DEPT | 16,510 |
| NORTH PENINSULA | 16,449 |
| SUMNER CITY OF | 16,438 |
| SNOHOMISH CITY OF | 16,367 |
| CHELAN CO PUD 1 | 16,190 |
| COAL CREEK UTILITY DISTRICT | 15,989 |
| KELSO CITY OF | 15,775 |
| PORT ORCHARD WATER DEPT | 15,355 |
| SHELTON CITY OF | 15,089 |
| QUIMPER | 14,548 |
| LIBERTY LAKE SEWER & WATER DISTRICT | 14,500 |
| SEQUIM CITY OF | 14,293 |
| BAINBRIDGE ISLAND CITY OF | 13,491 |
| DUPONT WATER SYSTEM CITY OF | 13,141 |
| PROSSER CITY OF | 12,070 |
| SKYWAY WATER & SEWER | 12,036 |
| BEACON HILL WATER & SEWER DISTRICT | 11,969 |
| NAVAL BASE KITSAP AT BREMERTON | 11,792 |
| CHEHALIS WATER DEPARTMENT | 11,718 |
| HOQUIAM WATER DEPARTMENT | 11,456 |
| DUVALL CITY OF | 11,050 |
| LEAVENWORTH CITY OF | 11,041 |
| GRANDVIEW CITY OF | 11,010 |
| WOODLAND CITY OF | 10,640 |
| MANCHESTER WATER DISTRICT | 10,475 |
| ORTING CITY OF | 10,332 |
| LWWSD - SOUTH SHORE WATER SYSTEM | 10,028 |
| NE SAMMAMISH SEWER & WATER DISTRICT | 9,702 |
| FAIRCHILD AIR FORCE BASE | 9,544 |
| AIRWAY HEIGHTS CITY OF | 9,489 |
| CONSOLIDATED IRRIG DIST 19 SYSTEM 1 | 9,434 |
| CHELAN WATER DEPT CITY OF | 9,425 |
| OCEAN SHORES WATER DEPT | 9,347 |
| SELAH CITY OF | 9,331 |
| BIRCH BAY WATER & SEWER DISTRICT | 9,046 |
| TOPPENISH WATER DEPARTMENT | 8,950 |
| PORT ANGELES COMPOSITE | 8,872 |
| OTHELLO WATER DEPARTMENT | 8,755 |
| EPHRATA WATER DEPARTMENT | 8,718 |
| NORTH BEND CITY OF | 8,710 |
| STEILACOOM TOWN OF | 8,545 |
| SULTAN WATER DEPARTMENT | 8,424 |
| QUINCY WATER DEPARTMENT CITY OF | 8,415 |
| YAK CO - TERRACE HEIGHTS | 8,410 |
| COLLEGE PLACE WATER DEPT | 8,147 |
| NORTH BEACH WATER | 8,093 |
| MILTON CITY OF | 8,078 |
| KALAMA CITY OF | 8,020 |
| FIRCREST CITY OF | 7,927 |
| PACIFIC CITY OF | 7,925 |
| MODEL IRRIGATION DIST #18 | 7,903 |
| TANGLEWILDE THOMPSON PLACE 600 | 7,900 |
| BUCKLEY WATER | 7,842 |
| STEVENS CO PUD - SUNCREST | 7,484 |
| JBLM McChord Field | 7,290 |
| LAKE CHELAN RECLAMATION DISTRICT | 6,798 |
| ELMA CITY OF | 6,638 |
| UNION GAP WATER | 6,433 |
| BLACK DIAMOND WATER DEPT | 6,407 |
| BLAINE CITY OF | 6,319 |
| PASADENA PARK IRR DIST 17 | 6,269 |
| SPO CO WATER DIST 3 SYS 4 | 6,233 |
| MONTESANO CITY OF | 6,204 |
| SNOQUALMIE PASS UTILITY DISTRICT | 5,832 |
| CASHMERE WATER DEPARTMENT | 5,815 |
| BENTON CITY WATER | 5,626 |
| MOXEE WATER DEPARTMENT | 5,599 |
| NORTH BAINBRIDGE WATER CO | 5,490 |
| DEER PARK CITY OF | 5,435 |
| KING COUNTY WATER DISTRICT #54 | 5,373 |
| Mattawa City of | 5,370 |
| GRANITE FALLS CITY OF | 5,349 |
| WESTPORT WATER DEPARTMENT | 5,346 |
| WATER DISTRICT 19 | 5,335 |
| WAPATO WATERWORKS | 5,255 |
| CONNELL CITY OF | 5,150 |
| GRAYS HARBOR CO WATER DIST 2 | 5,112 |
| MEDICAL LAKE CITY OF | 4,982 |
| COLVILLE WATER DEPARTMENT | 4,945 |
| OMAK CITY OF | 4,940 |
| VINLAND | 4,801 |
| STEVENSON WATER DEPT | 4,702 |
| WARDEN CITY OF | 4,674 |
| PATTISON 500 | 4,643 |
| LONG BEACH WATER DEPARTMENT | 4,628 |
| Raymond Water Department | 4,620 |
| BELFAIR WATER DISTRICT 1 | 4,432 |
| SOUTH BAINBRIDGE | 4,414 |
| CASTLE ROCK MUNICIPAL WATER | 4,367 |
| ORCHARD AVENUE IRRIGATION DIST 6 | 4,330 |
| GOLDENDALE CITY OF | 4,314 |
| EAST SPOKANE WATER DIST 1 | 4,285 |
| TRENTWOOD IRRIGATION DISTRICT 3 | 4,228 |
| SUQUAMISH | 4,203 |
| IRVIN WATER DISTRICT #6 | 4,150 |
| COUPEVILLE TOWN OF | 4,142 |
| WHITE SALMON CITY OF | 4,077 |
| GRANGER WATER DEPARTMENT | 3,993 |
| EATONVILLE WATER DEPT | 3,945 |
| EVERSON CITY OF | 3,893 |
| BREWSTER CITY OF | 3,843 |
| OKANOGAN WATER DEPARTMENT CITY OF | 3,817 |
| KING COUNTY WATER DISTRICT 119 | 3,800 |
| SPO CO WATER DIST 3 SYS 3 | 3,768 |
| GRAND MOUND | 3,764 |
| FRIDAY HARBOR TOWN OF | 3,543 |
| ZILLAH CITY OF | 3,518 |
| NACHES TOWN OF | 3,512 |
| COLFAX WATER DEPARTMENT CITY OF | 3,507 |
| WINLOCK CITY OF | 3,502 |
| FORKS MUNICIPAL WATER DEPT | 3,468 |
| ROYAL CITY WATER | 3,389 |
| DAYTON WATER DEPARTMENT | 3,374 |
| Tenino City of | 3,336 |
| NEWPORT CITY OF | 3,331 |
Largest first by population served, as each employer reports it to its federal registry.
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.
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