Colusa County, California
5 ZIP codes · Avg score 99/100 · Grade A
ZipCheckup grade for Colusa County: A.
Checked records flag no major concern; missing data is unknown.
Colusa County earns an A or B, the top two of ZipCheckup's five grades, based on the average composite Home Safety Score of its scored ZIP codes. That composite can draw on drinking water records, radon zones, PFAS monitoring and air quality data, so a strong grade summarizes several sources and is not a reading from anyone's tap. Scores also vary from one ZIP code to another, and the 5 ZIP reports listed for the county show where each one stands.
How Colusa County Compares
How Colusa County Compares
Colusa County scores 23 points above the California state average (76/100) 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
ZIP Code Risk Map
Water Quality Map: Colusa County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.5 (asthma 9.8%, diabetes 13.4%)
Modeled additional annual cost estimate per homeowner: $2,208, largest modeled factor: Flood
51% 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: $2,208
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
7,693 housing units in Colusa County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Health Outcomes vs National Average
CDC PLACES data for Colusa County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Colusa County ZIP codes
2 community water systems mapped to Colusa County ZIP codes; EPA may list more systems serving the county.
- A
- A
Systems with the most violations in Colusa County
1 water system with violations in EPA records.
- A
All ZIP Codes in Colusa County
5 ZIP codes tracked in Colusa County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 95932 | Colusa | 99 | A | 2 | $367K |
| 2 | 95987 | Williams | 99 | A | 2 | $372K |
| 3 | 95912 | Arbuckle | — | — | 2 | $425K |
| 4 | 95955 | Maxwell | — | — | 2 | $289K |
| 5 | 95979 | Stonyford | — | — | $247K |
Recommended Buyer Guides for Colusa County
The guides listed here are chosen from this county's data, and the short note beside each one says why it made the list.
- Best Lead Paint Test Kits — 51% of homes built before 1980
- 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 Colusa County, California
Overview
Colusa County in California covers 5 tracked ZIP records with an average Home Safety Score of A (99/100) across 2 scored records.
4 of 4 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. The available record reports no health-based violations for this measured scope.
← 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.