Contra Costa County, California
51 ZIP codes · Home Safety Score unavailable · 0 of 51 tracked ZIP records scored · Updated
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: Contra Costa County, California
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 9.4%, diabetes 11.3%)
Estimated additional annual cost per homeowner: $2,892, driven primarily by sea_level
67.3% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Contra Costa County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 35 violations. Past 5 years: 82 total (82 health-based). Health-based violations are rising versus the prior 2-year window - worth closer monitoring.
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: $2,892
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
420,819 housing units in Contra Costa 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 Contra Costa County
Remediation costs are relatively manageable for most homeowners in Contra Costa 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 Contra Costa County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Contra Costa County
8 community water systems serving Contra Costa County.
Show all 8 water systems
13 total water systems serve Contra Costa County.
All ZIP Codes in Contra Costa County
51 ZIP codes tracked in Contra Costa County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 94505 | Discovery Bay | — | — | 0 | $788K |
| 2 | 94506 | Danville | — | — | 0 | $1790K |
| 3 | 94507 | Alamo | — | — | 0 | $2000K |
| 4 | 94509 | Antioch | — | — | 0 | $565K |
| 5 | 94511 | Bethel Island | — | — | 0 | $550K |
| 6 | 94513 | Brentwood | — | — | 0 | $794K |
| 7 | 94514 | Byron | — | — | 0 | $853K |
| 8 | 94516 | Canyon | — | — | 0 | $787K |
| 9 | 94517 | Clayton | — | — | 0 | $996K |
| 10 | 94518 | Concord | — | — | 0 | $827K |
| 11 | 94519 | Concord | — | — | 0 | $728K |
| 12 | 94520 | Concord | — | — | 0 | $572K |
| 13 | 94521 | Concord | — | — | 0 | $823K |
| 14 | 94523 | Pleasant Hill | — | — | 0 | $1038K |
| 15 | 94524 | Concord | — | — | — | |
| 16 | 94525 | Crockett | — | — | 0 | $709K |
| 17 | 94526 | Danville | — | — | 0 | $1588K |
| 18 | 94527 | Concord | — | — | — | |
| 19 | 94528 | Diablo | — | — | 0 | $2000K |
| 20 | 94529 | Concord | — | — | — | |
| 21 | 94530 | El Cerrito | — | — | 0 | $1097K |
| 22 | 94531 | Antioch | — | — | 0 | $660K |
| 23 | 94547 | Hercules | — | — | 0 | $741K |
| 24 | 94548 | Knightsen | — | — | 0 | $918K |
| 25 | 94549 | Lafayette | — | — | 0 | $1969K |
| 26 | 94553 | Martinez | — | — | 0 | $781K |
| 27 | 94561 | Oakley | — | — | 0 | $632K |
| 28 | 94563 | Orinda | — | — | 0 | $1810K |
| 29 | 94564 | Pinole | — | — | 0 | $697K |
| 30 | 94565 | Pittsburg | — | — | 0 | $563K |
| 31 | 94569 | Port Costa | — | — | 0 | $587K |
| 32 | 94570 | Moraga | — | — | — | |
| 33 | 94572 | Rodeo | — | — | 0 | $654K |
| 34 | 94575 | Moraga | — | — | 0 | — |
| 35 | 94582 | San Ramon | — | — | 0 | $1544K |
| 36 | 94583 | San Ramon | — | — | 0 | $1234K |
| 37 | 94595 | Walnut Creek | — | — | 0 | $817K |
| 38 | 94596 | Walnut Creek | — | — | 0 | $1245K |
| 39 | 94597 | Walnut Creek | — | — | 0 | $987K |
| 40 | 94598 | Walnut Creek | — | — | 0 | $1307K |
| 41 | 94708 | Berkeley | — | — | 0 | $1517K |
| 42 | 94801 | Richmond | — | — | 0 | $594K |
| 43 | 94802 | Richmond | — | — | — | |
| 44 | 94803 | El Sobrante | — | — | 0 | $729K |
| 45 | 94804 | Richmond | — | — | 0 | $618K |
| 46 | 94805 | Richmond | — | — | 0 | $739K |
| 47 | 94806 | San Pablo | — | — | 0 | $582K |
| 48 | 94807 | Richmond | — | — | — | |
| 49 | 94808 | Richmond | — | — | — | |
| 50 | 94820 | El Sobrante | — | — | — | |
| 51 | 94850 | Richmond | — | — | — |
Recommended Buyer Guides for Contra Costa County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 67.3% of homes built before 1978
Deep Dive Reports
Detailed analysis for Contra Costa County, California
Overview
Contra Costa County in California covers 51 tracked ZIP records. No Home Safety Score is published because the required model evidence is incomplete for every tracked record; missing evidence is not treated as zero.
The available EPA record reports 0 violations for 42 ZIP codes with a reported violation count.
← 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.