Snohomish County, Washington
37 ZIP codes · Avg score 99/100 · Grade A · Updated
ZipCheckup grade for Snohomish County: A.
No federal data flags a major home-safety concern for this ZIP.
Within Snohomish County, all 37 tracked ZIP codes show above-average drinking water safety - violations are infrequent and typically minor.
How Snohomish County Compares
How Snohomish County Compares
Snohomish County scores 13 points above the Washington state average (86/100) and 26 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: Snohomish County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.7 (asthma 11.1%, diabetes 9.1%)
Estimated additional annual cost per homeowner: $1,807, driven primarily by flood
48.6% of homes built before 1978 (lead paint era)
Violation History (2021–2023)
→ Stable trendEPA violation counts by year across Snohomish County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 7 violations. Past 5 years: 15 total (15 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: $1,807
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
314,236 housing units in Snohomish 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 Snohomish County
Remediation costs are relatively manageable for most homeowners in Snohomish 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 Snohomish County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Snohomish County
8 community water systems serving Snohomish County.
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Show all 8 water systems
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34 total water systems serve Snohomish County.
Systems with the most violations in Snohomish County
5 water systems with recorded EPA violations.
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All ZIP Codes in Snohomish County
37 ZIP codes tracked in Snohomish County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 98012 | Bothell | 100 | A | 2 | $812K |
| 2 | 98020 | Edmonds | 100 | A | 3 | $959K |
| 3 | 98026 | Edmonds | 100 | A | 3 | $759K |
| 4 | 98036 | Lynnwood | 100 | A | 3 | $693K |
| 5 | 98037 | Lynnwood | 100 | A | 2 | $684K |
| 6 | 98043 | Mountlake Terrace | 100 | A | 1 | $606K |
| 7 | 98087 | Lynnwood | 100 | A | 0 | $633K |
| 8 | 98203 | Everett | 100 | A | 1 | $575K |
| 9 | 98204 | Everett | 100 | A | 1 | $386K |
| 10 | 98275 | Mukilteo | 100 | A | 1 | $830K |
| 11 | 98021 | Bothell | 99 | A | 5 | $903K |
| 12 | 98201 | Everett | 99 | A | 6 | $477K |
| 13 | 98208 | Everett | 99 | A | 5 | $641K |
| 14 | 98251 | Gold Bar | 99 | A | 4 | $415K |
| 15 | 98252 | Granite Falls | 99 | A | 3 (1 health) | $493K |
| 16 | 98258 | Lake Stevens | 99 | A | 4 | $607K |
| 17 | 98296 | Snohomish | 99 | A | 5 | $868K |
| 18 | 98270 | Marysville | 98 | A | 8 | $540K |
| 19 | 98294 | Sultan | 98 | A | 5 | $463K |
| 20 | 98271 | Marysville | 97 | A | 10 | $483K |
| 21 | 98290 | Snohomish | 96 | A | 13 (1 health) | $718K |
| 22 | 98272 | Monroe | 95 | A | 16 | $638K |
| 23 | 98223 | Arlington | 92 | A | 17 | $557K |
| 24 | 98046 | Lynnwood | — | — | — | |
| 25 | 98082 | Mill Creek | — | — | — | |
| 26 | 98205 | Everett | — | — | — | |
| 27 | 98206 | Everett | — | — | — | |
| 28 | 98207 | Everett | — | — | 1 | — |
| 29 | 98213 | Everett | — | — | — | |
| 30 | 98241 | Darrington | — | — | $391K | |
| 31 | 98253 | Greenbank | — | — | 21 | $710K |
| 32 | 98256 | Index | — | — | $380K | |
| 33 | 98259 | North Lakewood | — | — | — | |
| 34 | 98287 | Silvana | — | — | — | |
| 35 | 98291 | Snohomish | — | — | — | |
| 36 | 98293 | Startup | — | — | — | |
| 37 | 98297 | Waldron | — | — | 6 (1 health) | $409K |
Recommended Buyer Guides for Snohomish County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Snohomish County, Washington
Overview
Snohomish County in Washington covers 37 tracked ZIP records with an average Home Safety Score of A (99/100) across 23 scored records.
25 of 26 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 2 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.