STATE REPORT WA 4 ALERTS 51 HEALTH VIOLATIONS

Washington Water Quality & Safety Report

47 ZIP codes · 177 water systems · UPC plumbing code · Updated 2026-03-16

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-03-16

47
ZIP Codes
177
Water Systems
36
ZIPs with Violations
4
Active Alerts
UPC
Plumbing Code

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 47 ZIP codes across Washington, covering 177 community water systems that serve approximately 5,592,632 people.

36 of 47 ZIP codes (77%) have recorded EPA violations. 51 health-based violations have been documented.

Active Weather Alerts

4 active alerts in Washington including 2 warnings. Severe weather can directly affect tap water quality — flooding, power outages, and infrastructure damage may lead to boil-water advisories.

AlertSeverityAreas
Flood WatchSevereChelan, WA
Flood WarningSevereGrays Harbor, WA
Flood WatchSevereMason, WA
Flood WarningSevereGrays Harbor, WA

View all Washington alerts →

Plumbing Regulations

Washington follows the Uniform Plumbing Code (2021 edition).

  • Plumbing code: UPC (2021)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required
  • Seismic strapping: Required

Full Washington regulations →

Areas with Most Violations

ZIP CodeCitySafety ScoreViolationsHealth-BasedSystem
99301Pasco—2656PASCO WATER DEPARTMENT
99336Kennewick—19523KENNEWICK CITY OF
98014Carnation—1630LAKE MARGARET WATER SYSTEM
98901Yakima—893YAKIMA WATER DIVISION CITY OF
98277Oak Harbor—8217OAK HARBOR CITY OF
98371Puyallup—210PUYALLUP CITY OF
98401Tacoma—210TACOMA WATER DIVISION CITY OF
98201Everett—190EVERETT PUBLIC WORKS DEPT. CITY OF
98290Snohomish—170CROSS VALLEY WATER DISTRICT
98362Port Angeles—150PORT ANGELES CITY OF

Areas with No Violations

ZIP CodeCitySafety ScoreSystemPopulation
98004Bellevue—BELLEVUE CITY OF317,330
98010Black Diamond—BLACK DIAMOND WATER DEPT2,420
98024Fall City—FALL CITY WATER DIST. #1272,987
98028Kenmore—NORTHSHORE UTILITY DISTRICT105,105
98315Silverdale—SILVERDALE WATER DIST 1626,634
98329Gig Harbor—GIG HARBOR WATER DEPT14,902
98439Lakewood—LAKEWOOD WATER DISTRICT62,089
98503Lacey—LACEY WATER DEPARTMENT103,755
98801Wenatchee—WENATCHEE CITY OF43,690
99201Spokane—SPOKANE CITY OF343,167

Lead & Copper

  • 0 ZIP codes exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 0 ZIP codes (0%)
  • Moderate risk (Zone 2): 0 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

All 47 ZIP Codes in Washington

Data Sources

Updated daily.

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