Mono County, California
6 ZIP codes · Avg score 68/100 · Grade C · Updated 2026-06-03
Tracking 6 ZIP codes in Mono County reveals a mixed picture — tap water quality varies meaningfully by location.
How Mono County Compares
How Mono County Compares
Mono County scores 5 points below the California state average (73/100) and 0 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Mono County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.8 (asthma 9.9%, diabetes 10.5%)
Estimated additional annual cost per homeowner: $1,473, driven primarily by energy_code_gap
Infrastructure: 0.398% avg pipe failure probability, 50% of ZIPs at high risk
72.2% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Mono County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 violations. Past 5 years: 10 total (10 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: $1,473
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
8,885 housing units in Mono 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 Mono County
Remediation costs are relatively manageable for most homeowners in Mono 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 Mono 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 Mono County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | June Lake Pud - Down Canyon | 2,810 | 7 |
| 2 | June Lake Pud Village | 2,763 | 7 |
| 3 | Usmc/mtn Warfare Trng Ctr - Bridgeport | 1,200 | 5 |
| 4 | Bridgeport Pud | 524 | 5 |
| 5 | Usmc - Housing Coleville | 424 | 5 |
13 total water systems serve Mono County.
All ZIP Codes in Mono County
6 ZIP codes tracked in Mono County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 93517 | Bridgeport | 79 | B | 5 (1 health) | $321K |
| 2 | 93514 | Bishop | 71 | B | 3 (1 health) | $435K |
| 3 | 93541 | Lee Vining | 71 | B | 0 | $334K |
| 4 | 96107 | Coleville | 71 | B | 5 (3 health) | $371K |
| 5 | 93529 | June Lake | 63 | C | 7 (4 health) | $706K |
| 6 | 96133 | Topaz | 53 | D | 0 | — |
Recommended Buyer Guides for Mono County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 72.2% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Mono County, California
Overview
Mono County in California covers 6 ZIP codes with an average Home Safety Score of C (68/100).
4 of 6 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.