| Public water system | Population served |
|---|---|
| PORTLAND WATER BUREAU | 666,200 |
| TUALATIN VALLEY WATER DISTRICT | 224,600 |
| SALEM PUBLIC WORKS | 199,820 |
| EUGENE WATER & ELECTRIC BOARD | 176,000 |
| MEDFORD WATER COMMISSION | 106,068 |
| HILLSBORO, CITY OF | 92,632 |
| BEAVERTON, CITY OF | 88,045 |
| BEND, CITY OF | 77,704 |
| GRESHAM, CITY OF | 73,932 |
| ROCKWOOD PUD | 65,443 |
| TIGARD, CITY OF | 62,500 |
| SPRINGFIELD UTILITY BOARD | 62,100 |
| CORVALLIS, CITY OF | 61,468 |
| ALBANY, CITY OF | 57,997 |
| SUNRISE WATER AUTHORITY | 50,003 |
| KLAMATH FALLS WATER DEPT | 40,475 |
| LAKE OSWEGO MUNICIPAL WATER | 40,000 |
| KEIZER, CITY OF | 38,585 |
| REDMOND WATER DEPARTMENT | 37,566 |
| GRANTS PASS, CITY OF | 37,138 |
| MCMINNVILLE WATER & LIGHT | 34,515 |
| COOS BAY NORTH BEND WTR BRD | 34,500 |
| OREGON CITY | 33,940 |
| OAK LODGE WATER SERVICES | 30,000 |
| CLACKAMAS RIVER WATER | 29,918 |
| WOODBURN, CITY OF | 29,455 |
| ROSEBURG, CITY OF | 28,800 |
| TUALATIN, CITY OF | 28,106 |
| WEST LINN, CITY OF | 28,000 |
| FOREST GROVE, CITY OF | 26,838 |
| WILSONVILLE, CITY OF | 25,915 |
| NEWBERG, CITY OF | 25,138 |
| ASHLAND WATER DEPARTMENT | 20,946 |
| MILWAUKIE, CITY OF | 20,946 |
| LINCOLN CITY, CITY OF | 20,830 |
| HERMISTON, CITY OF | 20,000 |
| CLACKAMAS RIVER WATER - CLAIRMONT | 19,928 |
| SHERWOOD, CITY OF | 19,885 |
| CENTRAL POINT, CITY OF | 19,785 |
| LEBANON, CITY OF | 18,945 |
| CANBY UTILITY | 18,754 |
| DALLAS, CITY OF | 17,911 |
| PENDLETON, CITY OF | 16,996 |
| TROUTDALE, CITY OF | 16,185 |
| CORNELIUS, CITY OF | 14,490 |
| ONTARIO, CITY OF | 14,465 |
| SUBURBAN EAST SALEM WD | 13,900 |
| LA GRANDE, CITY OF | 13,460 |
| ST HELENS, CITY OF | 13,410 |
| THE DALLES, CITY OF | 13,010 |
| SANDY, CITY OF | 12,991 |
| GLADSTONE, CITY OF | 12,121 |
| DESCHUTES VALLEY WATER DIST | 11,700 |
| MONMOUTH, CITY OF | 11,651 |
| PRINEVILLE, CITY OF | 11,000 |
| WEST SLOPE WATER DISTRICT | 11,000 |
| COTTAGE GROVE, CITY OF | 10,879 |
| SILVERTON, CITY OF | 10,484 |
| NEWPORT, CITY OF | 10,439 |
| BAKER CITY | 10,349 |
| SWEET HOME, CITY OF | 10,322 |
| INDEPENDENCE WATER SYSTEM | 10,300 |
| MOLALLA, CITY OF | 10,298 |
| ASTORIA, CITY OF | 10,181 |
| FAIRVIEW, CITY OF | 9,963 |
| FLORENCE, CITY OF | 9,561 |
| EAGLE POINT, CITY OF | 9,554 |
| WARRENTON, CITY OF | 9,100 |
| SCAPPOOSE, CITY OF | 8,710 |
| HOOD RIVER, CITY OF | 8,577 |
| CITY OF STAYTON | 8,400 |
| WINSTON-DILLARD WATER DISTRICT | 8,300 |
| UMATILLA, CITY OF | 8,256 |
| SUTHERLIN, CITY OF | 8,060 |
| SEASIDE WATER DEPARTMENT | 7,482 |
| MILTON-FREEWATER, CITY OF | 7,145 |
| BROOKINGS, CITY OF | 7,120 |
| GREEN AREA WATER & SANITARY AUTHORITY | 7,000 |
| JUNCTION CITY WATER UTILITIES | 7,000 |
| SHERIDAN, CITY OF | 6,494 |
| RAINBOW WATER DISTRICT | 6,300 |
| TALENT, CITY OF | 6,293 |
| ICE FOUNTAIN WATER DISTRICT | 6,000 |
| SEAL ROCK WATER DISTRICT | 6,000 |
| CRYSTAL SPRINGS WATER DISTRICT | 5,973 |
| PHOENIX, CITY OF | 5,900 |
| ESTACADA, CITY OF | 5,750 |
| BOARDMAN, CITY OF | 5,749 |
| KERNVILLE-GLENEDEN-LINC BCH WD | 5,609 |
| CRESWELL, CITY OF | 5,585 |
| TILLAMOOK WATER DEPT, CITY OF | 5,265 |
| VENETA, CITY OF | 5,200 |
| HECETA WATER PEOPLES UTILITY DISTRICT | 4,921 |
| REEDSPORT, CITY OF | 4,836 |
| PHILOMATH PUBLIC WORKS | 4,670 |
| RALEIGH WATER DISTRICT | 4,500 |
| LAFAYETTE, CITY OF | 4,423 |
| WOOD VILLAGE, CITY OF | 4,388 |
| AUMSVILLE, CITY OF | 4,125 |
| RIVERGROVE WATER DISTRICT | 4,000 |
| COQUILLE, CITY OF | 3,953 |
| MADRAS, CITY OF | 3,940 |
| SISTERS, CITY OF | 3,778 |
| HARRISBURG, CITY OF | 3,684 |
| NORTH PLAINS WATER DEPARTMENT | 3,663 |
| MOUNT ANGEL, CITY OF | 3,650 |
| TOLEDO WATER UTILITIES | 3,645 |
| MYRTLE CREEK, CITY OF | 3,501 |
| TRI-CITY JW&SA | 3,500 |
| HUBBARD, CITY OF | 3,478 |
| JEFFERSON, CITY OF | 3,348 |
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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