Sonoma County, California
52 ZIP codes · Avg score 95/100 · Grade A
ZipCheckup grade for Sonoma County: A.
Checked records flag no major concern; missing data is unknown.
52 ZIP codes, one county grade: Sonoma County scores in ZipCheckup's upper tier.
How Sonoma County Compares
How Sonoma County Compares
Sonoma County scores 19 points above the California state average (76/100) and 22 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
ZIP Code Risk Map
Water Quality Map: Sonoma County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.3 (asthma 9.8%, diabetes 10.7%)
Modeled additional annual cost estimate per homeowner: $2,770, largest modeled factor: Flood
54% of homes built before 1980 (lead paint was banned for residential use in 1978)
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 DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,770
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
211,740 housing units in Sonoma 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 Sonoma County
Modeled remediation costs in Sonoma County can be compared with the median property value; actual costs vary by property.
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 Sonoma County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Sonoma County ZIP codes
8 community water systems mapped to Sonoma County ZIP codes; EPA may list more systems serving the county.
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Show all 8 water systems
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- C
48 water systems mapped to Sonoma County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Sonoma County
5 water systems with violations in EPA records.
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All ZIP Codes in Sonoma County
52 ZIP codes tracked in Sonoma County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 94556 | Moraga | 100 | A | 0 | $1594K |
| 2 | 95401 | Santa Rosa | 100 | A | 0 | $629K |
| 3 | 95403 | Santa Rosa | 100 | A | 1 | $652K |
| 4 | 95436 | Forestville | 100 | A | 2 | $704K |
| 5 | 95446 | Guerneville | 100 | A | 2 | $586K |
| 6 | 95492 | Windsor | 100 | A | 1 | $778K |
| 7 | 94931 | Cotati | 99 | A | 2 | $788K |
| 8 | 94952 | Petaluma | 99 | A | 2 | $1017K |
| 9 | 94954 | Petaluma | 99 | A | 2 | $790K |
| 10 | 95407 | Santa Rosa | 99 | A | 2 | $603K |
| 11 | 95425 | Cloverdale | 99 | A | 1 | $647K |
| 12 | 95441 | Geyserville | 99 | A | 1 | $1278K |
| 13 | 95448 | Healdsburg | 99 | A | 5 | $1030K |
| 14 | 95472 | Sebastopol | 96 | A | 4 (1 health) | $995K |
| 15 | 95405 | Santa Rosa | 95 | A | 3 (2 health) | $750K |
| 16 | 95409 | Santa Rosa | 95 | A | 3 (1 health) | $808K |
| 17 | 95497 | The Sea Ranch | 95 | A | 4 (1 health) | $1198K |
| 18 | 95404 | Santa Rosa | 89 | A | 11 (3 health) | $866K |
| 19 | 95442 | Glen Ellen | 83 | B | 0 | $1361K |
| 20 | 94928 | Rohnert Park | 81 | B | 4 | $635K |
| 21 | 95476 | Sonoma | 69 | C | 9 (3 health) | $882K |
| 22 | 94922 | Bodega | — | — | — | |
| 23 | 94923 | Bodega Bay | — | — | 0 | $1178K |
| 24 | 94926 | Rohnert Park | — | — | — | |
| 25 | 94927 | Rohnert Park | — | — | — | |
| 26 | 94951 | Penngrove | — | — | 2 | $1213K |
| 27 | 94953 | Petaluma | — | — | — | |
| 28 | 94955 | Petaluma | — | — | — | |
| 29 | 94972 | Valley Ford | — | — | 0 | — |
| 30 | 94975 | Petaluma | — | — | — | |
| 31 | 94999 | Petaluma | — | — | — | |
| 32 | 95402 | Santa Rosa | — | — | — | |
| 33 | 95406 | Santa Rosa | — | — | — | |
| 34 | 95412 | Annapolis | — | — | $746K | |
| 35 | 95416 | Boyes Hot Springs | — | — | — | |
| 36 | 95419 | Camp Meeker | — | — | — | |
| 37 | 95421 | Cazadero | — | — | 5 (1 health) | $643K |
| 38 | 95430 | Duncans Mills | — | — | 0 | — |
| 39 | 95431 | Eldridge | — | — | — | |
| 40 | 95433 | El Verano | — | — | — | |
| 41 | 95439 | Fulton | — | — | 0 | $818K |
| 42 | 95444 | Graton | — | — | $866K | |
| 43 | 95450 | Jenner | — | — | 5 (1 health) | $798K |
| 44 | 95452 | Kenwood | — | — | 1 | $969K |
| 45 | 95462 | Monte Rio | — | — | 0 | $714K |
| 46 | 95465 | Occidental | — | — | 0 | $1123K |
| 47 | 95466 | Philo | — | — | $699K | |
| 48 | 95471 | Rio Nido | — | — | 0 | $618K |
| 49 | 95473 | Sebastopol | — | — | — | |
| 50 | 95480 | Stewarts Point | — | — | — | |
| 51 | 95486 | Villa Grande | — | — | — | |
| 52 | 95487 | Vineburg | — | — | — |
Recommended Buyer Guides for Sonoma County
Which guides appear depends on what the county data show.
- Best Lead Paint Test Kits — 54% of homes built before 1980
- 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 Sonoma County, California
Overview
Sonoma County in California covers 52 tracked ZIP records with an average Home Safety Score of A (95/100) across 21 scored records.
22 of 32 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 8 health-based violations appear in the available health breakdown.
← Back to California 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.