Mariposa County, California
8 ZIP codes · Home Safety Score unavailable · 0 of 8 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: Mariposa County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14 (asthma 10.3%, diabetes 13.5%)
Estimated additional annual cost per homeowner: $2,199, driven primarily by wildfire
72.9% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Mariposa County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 2 violations. Past 5 years: 4 total (4 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: $2,199
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
9,108 housing units in Mariposa 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 Mariposa County
Remediation costs are relatively manageable for most homeowners in Mariposa 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 Mariposa County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Mariposa County
2 community water systems serving Mariposa County.
Systems with the most violations in Mariposa County
2 water systems with recorded EPA violations.
All ZIP Codes in Mariposa County
8 ZIP codes tracked in Mariposa County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 93623 | Fish Camp | — | — | — | |
| 2 | 95306 | Catheys Valley | — | — | — | |
| 3 | 95311 | Coulterville | — | — | 9 (4 health) | $296K |
| 4 | 95318 | El Portal | — | — | $298K | |
| 5 | 95325 | Hornitos | — | — | — | |
| 6 | 95338 | Mariposa | — | — | $367K | |
| 7 | 95345 | Midpines | — | — | $416K | |
| 8 | 95389 | Yosemite National Park | — | — | $913K |
Recommended Buyer Guides for Mariposa County
Independent picks. EPA-grounded. Matched here.
- Best Lead Paint Test Kits — 72.9% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Mariposa County, California
Overview
Mariposa County in California covers 8 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.
1 of 1 ZIP code with a reported violation count in the available EPA record have recorded EPA violations. 4 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.