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
60/100
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
0 (0%)
C
20 (51%)
D
6 (15%)
F
13 (33%)

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 69 C
#2 City of Seattle Water Department Seattle 753,000 68 C
#3 Auburn City of Auburn 107,655 68 C
#4 LACEY WATER DEPARTMENT Lacey 105,178 68 C
#5 SKAGIT COUNTY PUD 1 JUDY RES Mount Vernon 111,415 68 C
#6 ALDERWOOD WATER DISTRICT Lynnwood 245,715 67 C
#7 BELLINGHAM-WATER DIVISION CITY OF Bellingham 141,127 67 C
#8 EVERETT PUBLIC WORKS DEPT. CITY OF Everett 215,774 67 C
#9 SOOS CREEK WATER & SEWER DISTRICT Renton 64,534 67 C
#10 NORTHSHORE UTILITY DISTRICT Kenmore 99,789 67 C
#11 WOODINVILLE WATER DISTRICT Woodinville 66,699 67 C
#12 KIRKLAND CITY OF Kirkland 69,243 67 C
#13 PASCO WATER DEPARTMENT Pasco 115,102 67 C
#14 SEATTLE PUBLIC UTILITIES Seattle 1,161,961 67 C
#15 SILVER LAKE WATER & SEWER DISTRICT Bothell 65,033 67 C
#16 TACOMA WATER DIVISION CITY OF TACOMA 446,170 67 C
#17 YAKIMA WATER DIVISION CITY OF Yakima 112,858 67 C
#18 BREMERTON CITY OF Bremerton 72,951 65 C
#19 LYNNWOOD CITY OF Lynnwood 68,204 65 C
#20 City of Tacoma Water Department Tacoma 217,000 65 C
#21 BELLEVUE CITY OF Bellevue 321,349 62 D
#22 MARYSVILLE UTILITIES Marysville 88,582 62 D
#23 SNO PUD 1 - LAKE STEVENS Everett 67,710 62 D
#24 REDMOND WATER SYSTEM CITY OF Redmond 163,335 61 D
#25 OLYMPIA CITY OF OLYMPIA 126,966 56 D
#26 Spokane Water Utilities Spokane 229,000 55 D
#27 CLARK PUBLIC UTILITIES VANCOUVER 153,526 51 F
#28 JBLM Lewis Joint Base Lewis-McChord 62,197 51 F
#29 VANCOUVER CITY OF Vancouver 373,047 51 F
#30 KENT WATER DEPARTMENT Kent 166,421 50 F
#31 HIGHLINE WATER DISTRICT Kent 100,170 50 F
#32 SAMMAMISH PLATEAU WATER & SEWER Sammamish 79,362 50 F
#33 COVINGTON WATER DISTRICT Kent 56,172 50 F
#34 RICHLAND CITY OF Richland 106,499 50 F
#35 LAKEWOOD WATER DISTRICT LAKEWOOD 62,089 48 F
#36 SPOKANE CITY OF Spokane 343,167 48 F
#37 KENNEWICK CITY OF Kennewick 118,164 47 F
#38 LAKEHAVEN WATER AND SEWER DISTRICT FEDERAL WAY 148,809 47 F
#39 SOUTHWOOD Tacoma 64,155 47 F