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Washington Water Quality Ratings

TapWaterSafety has rated 39 public water systems in Washington, serving a combined 7,178,219 residents. The statewide average grade is D.

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
State average grade
D
69/100
Total utilities rated 39
Population served 7,178,219
Most recent test 2024
🇪🇺 Would fail EU standards 1 of 39

Top water quality concerns in Washington

  • Haloacetic acids (HAA9) significantly above health guideline
  • Haloacetic acids (HAA5) significantly above health guideline
  • Total trihalomethanes (TTHMs) significantly above health guideline
  • Arsenic significantly above health guideline
  • PFAS contamination

Grade distribution

A
0 (0%)
B
16 (41%)
C
11 (28%)
D
9 (23%)
F
3 (8%)

All rated utilities in Washington

Sorted by score, highest first. Click any utility to see the full grade card.

Rank Utility City Population Score Grade
#1 RENTON CITY OF Renton 108,091 83 B
#2 BELLINGHAM-WATER DIVISION CITY OF Bellingham 141,127 81 B
#3 ALDERWOOD WATER DISTRICT Lynnwood 245,715 80 B
#4 EVERETT PUBLIC WORKS DEPT. CITY OF Everett 215,774 80 B
#5 SILVER LAKE WATER & SEWER DISTRICT Bothell 65,033 80 B
#6 SKAGIT COUNTY PUD 1 JUDY RES Mount Vernon 111,415 80 B
#7 KIRKLAND CITY OF Kirkland 69,243 79 B
#8 SOOS CREEK WATER & SEWER DISTRICT Renton 64,534 78 B
#9 NORTHSHORE UTILITY DISTRICT Kenmore 99,789 78 B
#10 WOODINVILLE WATER DISTRICT Woodinville 66,699 78 B
#11 LYNNWOOD CITY OF Lynnwood 68,204 78 B
#12 SEATTLE PUBLIC UTILITIES Seattle 1,161,961 78 B
#13 TACOMA WATER DIVISION CITY OF TACOMA 446,170 78 B
#14 City of Seattle Water Department Seattle 753,000 77 B
#15 LACEY WATER DEPARTMENT Lacey 105,178 76 B
#16 Auburn City of Auburn 107,655 75 B
#17 PASCO WATER DEPARTMENT Pasco 115,102 74 C
#18 YAKIMA WATER DIVISION CITY OF Yakima 112,858 73 C
#19 City of Tacoma Water Department Tacoma 217,000 73 C
#20 BELLEVUE CITY OF Bellevue 321,349 71 C
#21 BREMERTON CITY OF Bremerton 72,951 71 C
#22 REDMOND WATER SYSTEM CITY OF Redmond 163,335 71 C
#23 SNO PUD 1 - LAKE STEVENS Everett 67,710 70 C
#24 Spokane Water Utilities Spokane 229,000 68 C
#25 JBLM Lewis Joint Base Lewis-McChord 62,197 66 C
#26 MARYSVILLE UTILITIES Marysville 88,582 66 C
#27 OLYMPIA CITY OF OLYMPIA 126,966 66 C
#28 VANCOUVER CITY OF Vancouver 373,047 64 D
#29 LAKEWOOD WATER DISTRICT LAKEWOOD 62,089 62 D
#30 COVINGTON WATER DISTRICT Kent 56,172 61 D
#31 CLARK PUBLIC UTILITIES VANCOUVER 153,526 58 D
#32 SOUTHWOOD Tacoma 64,155 58 D
#33 SPOKANE CITY OF Spokane 343,167 58 D
#34 KENT WATER DEPARTMENT Kent 166,421 57 D
#35 HIGHLINE WATER DISTRICT Kent 100,170 56 D
#36 SAMMAMISH PLATEAU WATER & SEWER Sammamish 79,362 56 D
#37 LAKEHAVEN WATER AND SEWER DISTRICT FEDERAL WAY 148,809 52 F
#38 RICHLAND CITY OF Richland 106,499 52 F
#39 KENNEWICK CITY OF Kennewick 118,164 47 F