Calaveras County, California
16 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-06-03
Monitoring figures for Calaveras County indicate average water quality overall — some ZIP codes among the 16 tracked have recorded health-based violations, while others operate cleanly, making individual ZIP-level data the most actionable reference point.
How Calaveras County Compares
How Calaveras County Compares
Calaveras County scores 10 points below the California state average (73/100) and 5 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Calaveras County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.8 (asthma 10.3%, diabetes 13.2%)
Estimated additional annual cost per homeowner: $2,205, driven primarily by wildfire
Infrastructure: 0.29% avg pipe failure probability
54.7% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Calaveras County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 8 violations. Past 5 years: 20 total (20 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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,205
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
25,976 housing units in Calaveras 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 Calaveras County
Remediation costs are relatively manageable for most homeowners in Calaveras 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 Calaveras County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Calaveras County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Ccwd - Jenny Lind | 9,861 | 8 |
| 2 | Ccwd - Copper Cove | 5,187 | 8 |
| 3 | Ccwd - West Point | 1,043 | 8 |
| 4 | UNION PUBLIC UTILITY DISTRICT | 4,774 | 6 |
| 5 | CCWD - EBBETTS PASS | 11,545 | 6 |
15 total water systems serve Calaveras County.
All ZIP Codes in Calaveras County
16 ZIP codes tracked in Calaveras County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 95247 | Murphys | 77 | B | 1 (1 health) | $514K |
| 2 | 95249 | San Andreas | 76 | B | 3 (3 health) | $409K |
| 3 | 95250 | San Andreas | 76 | B | 3 (3 health) | — |
| 4 | 95252 | Valley Springs | 73 | B | 0 | $444K |
| 5 | 95222 | Angels Camp | 71 | B | 2 (1 health) | $488K |
| 6 | 95255 | West Point | 71 | B | 2 (1 health) | $272K |
| 7 | 95228 | Copperopolis | 63 | C | 0 | $453K |
| 8 | 95246 | Mountain Ranch | 63 | C | 0 | $409K |
| 9 | 95251 | Vallecito | 63 | C | 0 | $390K |
| 10 | 95223 | Arnold | 58 | C | 0 | $476K |
| 11 | 95221 | Altaville | 53 | D | 0 | — |
| 12 | 95224 | Avery | 53 | D | 0 | — |
| 13 | 95229 | Douglas Flat | 53 | D | 0 | — |
| 14 | 95233 | Hathaway Pines | 53 | D | 0 | $298K |
| 15 | 95248 | Rail Road Flat | 53 | D | 0 | — |
| 16 | 95257 | Wilseyville | 53 | D | 0 | $336K |
Recommended Buyer Guides for Calaveras 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 Lead Paint Test Kits — 54.7% 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 Calaveras County, California
Overview
Calaveras County in California covers 16 ZIP codes with an average Home Safety Score of C (63/100).
5 of 16 ZIP codes have recorded EPA violations. 9 health-based violations have been documented.
← Back to California water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.