STATE REPORT WA HEALTH VIOLATIONS: 171

Washington Home Safety Profiles by ZIP

726 ZIP codes · 549 water systems · UPC plumbing code

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 726 ZIP codes across Washington, covering 549 public water systems that serve about 7,614,893 people. 311 ZIP codes are mapped to at least one water system with an EPA violation on record.

726
ZIP Codes
549
Water Systems
311
ZIPs with Violations
UPC
Plumbing Code
A · 86
Avg Safety Score
17
ZIPs Mapped to a System Above the Lead Action Level
18%
EPA Radon Zone 1 (county-level potential)
#7
of 50 States
80%
ZIPs Rated A or B
74%
ZIPs with Violations
A
Washington average: 86/100 - ranked #7 of 50 states. 13 points above the national average (73). 80% of ZIP codes scored A or B.

The statewide grade for Washington summarizes several public data sources, including EPA water system records, and it sits in the upper tier.

Score Distribution

How Washington's 726 ZIP codes are distributed across safety grades.

174
A
60
B
17
C
41
D
2
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 ZIP Codes by Home Safety Score in Washington

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 98002 AuburnKing 100 A
2 98005 BellevueKing 100 A
3 98007 BellevueKing 100 A
4 98008 BellevueKing 100 A
5 98011 BothellKing 100 A
6 98012 BothellSnohomish 100 A
7 98020 EdmondsSnohomish 100 A
8 98022 EnumclawKing 100 A
9 98026 EdmondsSnohomish 100 A
10 98028 KenmoreKing 100 A

10 Lowest-Scoring ZIP Codes in Washington

#ZIP CodeCityCountyScoreGradeViolations
1 99006 Deer ParkSpokane 36 F 43
2 99003 ChattaroySpokane 36 F 43
3 99217 SpokaneSpokane 42 D 21
4 99216 SpokaneSpokane 42 D 20
5 99206 SpokaneSpokane 42 D 20
6 99223 SpokaneSpokane 46 D 10
7 98683 VancouverClark 46 D 8
8 99224 SpokaneSpokane 47 D 10
9 99212 SpokaneSpokane 47 D 7
10 99208 SpokaneSpokane 47 D 10

County Rankings

Water quality breakdown by county. 39 counties with data in Washington.

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
53001 80 B 5 99344 (80) 99344 (80)
53003 83 B 3 99403 (83) 99403 (83)
53005 66 C 9 99353 (76) 99320 (59)
53007 98 A 14 98836 (100) 98816 (96)
53009 94 A 11 98331 (99) 98382 (83)
53011 49 D 21 98606 (50) 98683 (46)
53013 N/A N/A 2 N/A N/A
53015 98 A 11 98625 (99) 98674 (98)
53017 N/A N/A 7 N/A N/A
53019 N/A N/A 9 N/A N/A
53021 79 B 6 99301 (79) 99301 (79)
53023 N/A N/A 1 N/A N/A
53025 70 B 16 98857 (83) 98837 (50)
53027 99 A 20 98541 (99) 98520 (97)
53029 N/A N/A 8 N/A N/A
53031 100 A 7 98339 (100) 98368 (99)
53033 96 A 122 98002 (100) 98092 (79)
53035 96 A 26 98310 (100) 98367 (81)
53037 83 B 11 98068 (83) 98926 (83)
53039 82 B 14 98620 (83) 98672 (81)
53041 88 A 23 98532 (96) 98531 (80)
53043 N/A N/A 12 N/A N/A
53045 98 A 10 98548 (99) 98584 (98)
53047 67 C 19 98841 (67) 98841 (67)
53049 100 A 15 98577 (100) 98640 (99)
53051 N/A N/A 7 N/A N/A
53053 92 A 82 98327 (100) 98338 (67)
53055 N/A N/A 8 N/A N/A
53057 99 A 16 98101 (100) 98257 (97)
53059 N/A N/A 6 N/A N/A
53061 99 A 37 98012 (100) 98223 (92)
53063 48 D 51 99019 (63) 99006 (36)
53065 56 C 19 99114 (63) 99026 (49)
53067 89 A 21 98512 (98) 98502 (69)
53069 N/A N/A 4 N/A N/A
53071 66 C 9 99324 (67) 99337 (64)
53073 91 A 16 98266 (100) 98226 (82)
53075 82 B 23 99163 (82) 99111 (81)
53077 78 B 25 98948 (83) 98951 (70)

Most Common Contaminants in Washington

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Surface Water Treatment Rule Treatment Technique 233 577 No
Consumer Confidence Report Rule Reporting 136 309 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 131 266 Yes
Haloacetic Acids (HAA5) Disinfection Byproducts 131 322 Yes
Lead Inorganic 126 419 Yes
Stage 1 DBP Rule Treatment Technique 61 95 Yes
E. coli Microbiological 51 83 Yes
PFOA PFAS 30 57 No

Overview

We track multi-source home safety signals for 726 ZIP records across Washington. Home Safety Score model 4.0.0 is published for 294 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 422 ZIP records, covering 549 community water systems that serve approximately 7,614,893 people.

311 of 422 ZIP codes with a reported violation count in the available EPA record (74%) have recorded EPA violations. 171 health-based violations appear in the available health breakdown.

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 Code City Home Safety Grade Violations Health-Based System
98528 Belfair — 166 1 Belfair Water District 1
98277 Oak Harbor — 152 41 City of Oak Harbor
98848 Quincy C 132 2 City of Quincy Water Department
99156 Newport — 127 0 City of Newport
99362 Walla Walla C 119 0 Walla Walla Water Division
98382 Sequim B 107 1 City of Sequim
99324 College Place C 106 0 College Place Water Department
98282 Camano Island — 92 16 Camano Water Association
98338 Graham C 91 1 Southwood
98328 Eatonville B 86 0 Eatonville Water Department

Areas with No Violations

ZIP Code City Home Safety Grade System Population
98005 Bellevue A City of Bellevue 321,349
98007 Bellevue A City of Bellevue 321,349
98008 Bellevue A City of Bellevue 321,349
98010 Black Diamond B Covington Water District 56,172
98025 Hobart — Cedar River Water & Sewer District 28,671
98033 Kirkland B City of Kirkland 69,243
98039 Medina A City of Bellevue 321,349
98040 Mercer Island A City of Mercer Island 31,057
98050 Preston — Issaquah Water System 43,584
98051 Ravensdale B Covington Water District 56,172

Home Safety Score

Average Home Safety Score for Washington: A (86/100) across 294 scored of 726 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0043 mg/L (EPA action level: 0.015 mg/L)
  • 17 of 414 ZIP codes with known status exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 133 ZIP codes (18%)
  • Moderate risk (Zone 2): 145 ZIP codes
  • Low risk (Zone 3): 448 ZIP codes

ZIP Code Reports for Washington

Largest Communities

ZIP Code City Population Safety Grade Violations
98168 Seattle 1,500,385 A 1
98146 Seattle 1,334,092 A 0
98166 Seattle 1,334,092 A 0
98178 Seattle 1,318,386 A 0
98155 Seattle 1,297,768 A 0
98108 Seattle 1,246,728 A 0
98106 Seattle 1,210,430 A 0
98133 Seattle 1,195,083 A 0
98177 Seattle 1,162,236 A 0
98101 Seattle 1,161,961 A 0
98102 Seattle 1,161,961 A 0
98103 Seattle 1,161,961 A 0
98104 Seattle 1,161,961 A 0
98105 Seattle 1,161,961 A 0
98107 Seattle 1,161,961 A 0
98109 Seattle 1,161,961 A 0
98112 Seattle 1,161,961 A 0
98115 Seattle 1,161,961 A 0
98116 Seattle 1,161,961 A 0
98117 Seattle 1,161,961 A 0

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
99003 Chattaroy 36 F 43
99006 Deer Park 36 F 43
99206 Spokane 42 D 20
99216 Spokane 42 D 20
99217 Spokane 42 D 21

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
98002 Auburn 100 A 2
98005 Bellevue 100 A 0
98007 Bellevue 100 A 0
98008 Bellevue 100 A 0
98011 Bothell 100 A 1

All 726 ZIP Codes in Washington

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in Washington

The 12 largest community water systems in Washington, out of 549 in our data.

Show all 12 water systems

Systems with the most violations in Washington

12 systems in Washington with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Washington?

Washington has 549 community water systems serving 7,614,893 people across 726 ZIP codes. There are 2,107 recorded violations among these water systems, including 171 health-based. 311 of 726 ZIP codes are mapped to at least one water system with a recorded violation.

What plumbing code does Washington follow?

Washington's listed plumbing code type is UPC as of our last review; local jurisdictions may adopt or amend codes. Plumbing work may require a licensed plumber; check state exemptions and local requirements.

Is lead a concern in Washington's drinking water?

17 ZIP codes in Washington are mapped to water systems whose reported 90th-percentile lead result exceeded the EPA action level of 0.015 mg/L.

What is the radon risk in Washington?

18% of ZIP codes in Washington are mapped to counties classified as EPA Radon Zone 1 (highest county-level radon potential).

How to cite this page

APA ZipCheckup. (2026). Washington Home Safety Profiles by ZIP. https://zipcheckup.com/states/washington/
BibTeX 
@misc{zipcheckup-states-washington,
  author = {{ZipCheckup}},
  title  = {{Washington Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/washington/}
}

Page version: October 2026.

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