King County, Washington
122 ZIP codes · Avg score 96/100 · Grade A · Updated
ZipCheckup grade for King County: A.
No federal data flags a major home-safety concern for this ZIP.
Compared to state averages, King County scores well - its 122 ZIP codes sit above the baseline for tap water quality.
How King County Compares
How King County Compares
King County scores 10 points above the Washington state average (86/100) and 23 points above the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: King County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 8.8 (asthma 9.7%, diabetes 7.3%)
Estimated additional annual cost per homeowner: $2,190, driven primarily by sea_level
54.5% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across King County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 1 violation. Past 5 years: 2 total (2 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,190
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
964,697 housing units in King County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in King County
Remediation costs are relatively manageable for most homeowners in King County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for King County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving King County
8 community water systems serving King County.
- A
- B
- B
- A
- A
- A
Show all 8 water systems
- A
- A
70 total water systems serve King County.
Systems with the most violations in King County
5 water systems with recorded EPA violations.
- A
- B
- A
- B
- B
All ZIP Codes in King County
122 ZIP codes tracked in King County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 98002 | Auburn | 100 | A | 2 | $398K |
| 2 | 98005 | Bellevue | 100 | A | 0 | $1373K |
| 3 | 98007 | Bellevue | 100 | A | 0 | $935K |
| 4 | 98008 | Bellevue | 100 | A | 0 | $1130K |
| 5 | 98011 | Bothell | 100 | A | 1 | $888K |
| 6 | 98022 | Enumclaw | 100 | A | 2 | $577K |
| 7 | 98028 | Kenmore | 100 | A | 1 | $870K |
| 8 | 98034 | Kirkland | 100 | A | 1 | $875K |
| 9 | 98039 | Medina | 100 | A | 0 | $2000K |
| 10 | 98040 | Mercer Island | 100 | A | 0 | $1884K |
| 11 | 98055 | Renton | 100 | A | 0 | $562K |
| 12 | 98056 | Renton | 100 | A | 0 | $726K |
| 13 | 98057 | Renton | 100 | A | 1 | $607K |
| 14 | 98072 | Woodinville | 100 | A | 3 | $1067K |
| 15 | 98077 | Woodinville | 100 | A | 2 | $1132K |
| 16 | 98102 | Seattle | 100 | A | 0 | $989K |
| 17 | 98103 | Seattle | 100 | A | 0 | $1013K |
| 18 | 98104 | Seattle | 100 | A | 0 | $663K |
| 19 | 98105 | Seattle | 100 | A | 0 | $1261K |
| 20 | 98106 | Seattle | 100 | A | 0 | $667K |
| 21 | 98107 | Seattle | 100 | A | 0 | $925K |
| 22 | 98108 | Seattle | 100 | A | 0 | $694K |
| 23 | 98109 | Seattle | 100 | A | 0 | $986K |
| 24 | 98112 | Seattle | 100 | A | 0 | $1407K |
| 25 | 98115 | Seattle | 100 | A | 0 | $1042K |
| 26 | 98116 | Seattle | 100 | A | 0 | $917K |
| 27 | 98117 | Seattle | 100 | A | 0 | $1028K |
| 28 | 98118 | Seattle | 100 | A | 0 | $746K |
| 29 | 98119 | Seattle | 100 | A | 0 | $1033K |
| 30 | 98121 | Seattle | 100 | A | 0 | $797K |
| 31 | 98122 | Seattle | 100 | A | 0 | $929K |
| 32 | 98125 | Seattle | 100 | A | 0 | $845K |
| 33 | 98126 | Seattle | 100 | A | 0 | $752K |
| 34 | 98133 | Seattle | 100 | A | 0 | $719K |
| 35 | 98134 | Seattle | 100 | A | 0 | $385K |
| 36 | 98136 | Seattle | 100 | A | 0 | $900K |
| 37 | 98144 | Seattle | 100 | A | 0 | $890K |
| 38 | 98146 | Seattle | 100 | A | 0 | $642K |
| 39 | 98155 | Seattle | 100 | A | 0 | $758K |
| 40 | 98158 | Seattle | 100 | A | 0 | — |
| 41 | 98166 | Seattle | 100 | A | 0 | $786K |
| 42 | 98168 | Seattle | 100 | A | 1 | $501K |
| 43 | 98177 | Seattle | 100 | A | 0 | $996K |
| 44 | 98178 | Seattle | 100 | A | 0 | $628K |
| 45 | 98199 | Seattle | 100 | A | 0 | $1160K |
| 46 | 98004 | Bellevue | 99 | A | 3 | $2000K |
| 47 | 98014 | Carnation | 99 | A | 3 | $850K |
| 48 | 98030 | Kent | 99 | A | 6 | $540K |
| 49 | 98032 | Kent | 99 | A | 2 | $473K |
| 50 | 98045 | North Bend | 99 | A | 4 | $846K |
| 51 | 98047 | Pacific | 99 | A | 2 | $431K |
| 52 | 98058 | Renton | 99 | A | 3 | $627K |
| 53 | 98059 | Renton | 99 | A | 3 | $810K |
| 54 | 98148 | Seattle | 99 | A | 1 (1 health) | $576K |
| 55 | 98188 | Seattle | 99 | A | 3 (1 health) | $453K |
| 56 | 98198 | Seattle | 99 | A | 3 (1 health) | $527K |
| 57 | 98006 | Bellevue | 98 | A | 5 | $1234K |
| 58 | 98027 | Issaquah | 98 | A | 6 | $976K |
| 59 | 98031 | Kent | 98 | A | 6 | $552K |
| 60 | 98065 | Snoqualmie | 98 | A | 6 | $890K |
| 61 | 98070 | Vashon | 93 | A | 8 (1 health) | $718K |
| 62 | 98019 | Duvall | 85 | A | 45 | $747K |
| 63 | 98003 | Federal Way | 83 | B | 1 | $429K |
| 64 | 98010 | Black Diamond | 83 | B | 0 | $793K |
| 65 | 98023 | Federal Way | 83 | B | 1 | $546K |
| 66 | 98029 | Issaquah | 83 | B | 1 | $964K |
| 67 | 98033 | Kirkland | 83 | B | 0 | $1260K |
| 68 | 98051 | Ravensdale | 83 | B | 0 | $703K |
| 69 | 98052 | Redmond | 83 | B | 0 | $1108K |
| 70 | 98053 | Redmond | 83 | B | 2 | $1156K |
| 71 | 98074 | Sammamish | 83 | B | 1 | $1212K |
| 72 | 98075 | Sammamish | 83 | B | 0 | $1458K |
| 73 | 98001 | Auburn | 82 | B | 6 | $539K |
| 74 | 98038 | Maple Valley | 82 | B | 4 | $714K |
| 75 | 98042 | Kent | 82 | B | 5 | $613K |
| 76 | 98092 | Auburn | 79 | B | 14 (1 health) | $595K |
| 77 | 98009 | Bellevue | — | — | — | |
| 78 | 98013 | Burton | — | — | — | |
| 79 | 98015 | Bellevue | — | — | — | |
| 80 | 98024 | Fall City | — | — | 3 | $1005K |
| 81 | 98025 | Hobart | — | — | 0 | — |
| 82 | 98035 | Kent | — | — | — | |
| 83 | 98041 | Bothell | — | — | — | |
| 84 | 98050 | Preston | — | — | 0 | — |
| 85 | 98062 | Seahurst | — | — | — | |
| 86 | 98063 | Federal Way | — | — | — | |
| 87 | 98064 | Kent | — | — | — | |
| 88 | 98071 | Auburn | — | — | — | |
| 89 | 98073 | Redmond | — | — | — | |
| 90 | 98083 | Kirkland | — | — | — | |
| 91 | 98089 | Kent | — | — | — | |
| 92 | 98093 | Federal Way | — | — | — | |
| 93 | 98111 | Seattle | — | — | — | |
| 94 | 98113 | Seattle | — | — | — | |
| 95 | 98114 | Seattle | — | — | — | |
| 96 | 98124 | Seattle | — | — | — | |
| 97 | 98127 | Seattle | — | — | — | |
| 98 | 98129 | Seattle | — | — | — | |
| 99 | 98131 | Seattle | — | — | — | |
| 100 | 98132 | Seattle | — | — | — | |
| 101 | 98138 | Seattle | — | — | — | |
| 102 | 98139 | Seattle | — | — | — | |
| 103 | 98141 | Seattle | — | — | — | |
| 104 | 98145 | Seattle | — | — | — | |
| 105 | 98154 | Seattle | — | — | — | |
| 106 | 98160 | Seattle | — | — | — | |
| 107 | 98161 | Seattle | — | — | — | |
| 108 | 98164 | Seattle | — | — | $715K | |
| 109 | 98165 | Seattle | — | — | — | |
| 110 | 98170 | Seattle | — | — | — | |
| 111 | 98171 | Seattle | — | — | — | |
| 112 | 98174 | Seattle | — | — | 0 | — |
| 113 | 98175 | Seattle | — | — | — | |
| 114 | 98181 | Seattle | — | — | — | |
| 115 | 98185 | Seattle | — | — | — | |
| 116 | 98189 | Seattle | — | — | — | |
| 117 | 98190 | Seattle | — | — | — | |
| 118 | 98191 | Seattle | — | — | — | |
| 119 | 98194 | Seattle | — | — | — | |
| 120 | 98195 | Seattle | — | — | 0 | — |
| 121 | 98224 | Baring | — | — | $605K | |
| 122 | 98288 | Skykomish | — | — | $442K |
Recommended Buyer Guides for King County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Water Filters for PFAS — PFAS detected in 1 ZIP code
- Best Lead Paint Test Kits — 54.5% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for King County, Washington
Overview
King County in Washington covers 122 tracked ZIP records with an average Home Safety Score of A (96/100) across 76 scored records.
36 of 81 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 3 health-based violations appear in the available health breakdown.
← Back to Washington Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.