State rankings
Washington water-system rankings
Lowest-scoring systems in Washington
Ranked lowest score first. Population shown for context.
1 ARTONDALE Tacoma, WA · ~5,828 served 12 2 CLARK PUBLIC UTILITIES VANCOUVER, WA · ~153,526 served 34 3 RICHLAND CITY OF Richland, WA · ~106,499 served 34 4 QUISTORFF Tacoma, WA · ~1,113 served 34 5 JBLM Lewis Joint Base Lewis-McChord, WA · ~62,197 served 36 6 FAIRCHILD AIR FORCE BASE Fairchild AFB, WA · ~9,544 served 42 7 PARKLAND LIGHT & WATER COMPANY Tacoma, WA · ~29,595 served 46 8 KENNEWICK CITY OF Kennewick, WA · ~118,164 served 48 9 VANCOUVER CITY OF Vancouver, WA · ~373,047 served 49 10 TRENTWOOD IRRIGATION DISTRICT 3 SPOKANE, WA · ~4,228 served 52 11 BENTON CITY WATER Benton City, WA · ~5,626 served 53 12 FIRGROVE MUTUAL INC Puyallup, WA · ~36,168 served 57 13 CAMAS MUNICIPAL WATER SEWER SYSTEM Camas, WA · ~31,794 served 57 14 TAHOLAH TAHOLAH, WA · ~1,600 served 60 15 WELLPINIT WELLPINIT, WA · ~525 served 60 16 TWO RIVERS RESORT WELLPINIT, WA · ~480 served 60 17 MCCOY LAKE WELLPINIT, WA · ~325 served 60 18 FORT SIMCOE JOB CORPS CTR WHITE SWAN, WA · ~230 served 60 19 RESERVATION ROAD WELLPINIT, WA · ~110 served 60 20 COVINGTON WATER DISTRICT Kent, WA · ~56,172 served 64 21 SAMMAMISH PLATEAU WATER & SEWER Sammamish, WA · ~79,362 served 67 22 MOSES LAKE CITY OF Moses Lake, WA · ~32,428 served 67 23 COUPEVILLE TOWN OF Coupeville, WA · ~4,077 served 67 24 SOUTHWOOD Tacoma, WA · ~64,155 served 70 25 SPANAWAY WATER COMPANY Spanaway, WA · ~31,908 served 70
Highest-scoring large systems in Washington
Systems serving 10,000+ people with the best scores.
1 SEATTLE PUBLIC UTILITIES Seattle, WA · ~1,161,961 served 100 2 TACOMA WATER DIVISION CITY OF TACOMA, WA · ~446,170 served 100 3 BELLEVUE CITY OF Bellevue, WA · ~321,349 served 100 4 ALDERWOOD WATER DISTRICT Lynnwood, WA · ~245,715 served 100 5 EVERETT PUBLIC WORKS DEPT. CITY OF Everett, WA · ~215,774 served 100 6 KENT WATER DEPARTMENT Kent, WA · ~166,421 served 100 7 BELLINGHAM-WATER DIVISION CITY OF Bellingham, WA · ~141,127 served 100 8 PASCO WATER DEPARTMENT Pasco, WA · ~115,102 served 100
Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.