Inyo County, California
42 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
Water safety in Inyo County is uneven — some of its 42 ZIP codes meet standards cleanly while others carry documented violations.
How Inyo County Compares
How Inyo County Compares
Inyo County scores 14 points below the California state average (73/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Inyo County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.3 (asthma 9.5%, diabetes 12.4%)
Estimated additional annual cost per homeowner: $2,856, driven primarily by wildfire
Infrastructure: 0.371% avg pipe failure probability, 30% of ZIPs at high risk
73.8% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Inyo 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: $2,856
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
202,167 housing units in Inyo 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 Inyo County
Remediation costs are relatively manageable for most homeowners in Inyo 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 Inyo 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 Inyo County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Inyo County Pwd - Lone Pine | 1,835 | 13 |
| 2 | Inyo County Pwd - Independence | 1,108 | 13 |
| 3 | Charles Brown Water Company | 242 | 8 |
| 4 | Rolling Green Utilities, Inc. | 1,225 | 5 |
| 5 | Big Pine Csd | 792 | 5 |
36 total water systems serve Inyo County.
All ZIP Codes in Inyo County
42 ZIP codes tracked in Inyo County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 93546 | Mammoth Lakes | 83 | B | 1 | $619K |
| 2 | 92328 | Death Valley | 82 | B | 2 | $78K |
| 3 | 93545 | Lone Pine | 81 | B | 1 | $193K |
| 4 | 92384 | Shoshone | 77 | B | 8 (2 health) | — |
| 5 | 93526 | Independence | 73 | B | 13 (2 health) | $268K |
| 6 | 93522 | Darwin | 70 | B | 3 (2 health) | — |
| 7 | 93513 | Big Pine | 67 | C | 5 (1 health) | $289K |
| 8 | 93515 | Bishop | 67 | C | 3 (1 health) | — |
| 9 | 90232 | Culver City | 63 | C | 0 | $1492K |
| 10 | 90710 | Harbor City | 63 | C | 0 | $649K |
| 11 | 90731 | San Pedro | 63 | C | 0 | $809K |
| 12 | 90732 | San Pedro | 63 | C | 0 | $785K |
| 13 | 90744 | Wilmington | 63 | C | 0 | $596K |
| 14 | 91759 | Mt Baldy | 63 | C | 0 | $340K |
| 15 | 93040 | Piru | 63 | C | 0 | $581K |
| 16 | 93066 | Somis | 63 | C | 0 | $1366K |
| 17 | 93530 | Keeler | 63 | C | 0 | — |
| 18 | 90230 | Culver City | 55 | C | 0 | $1025K |
| 19 | 90292 | Marina Del Rey | 55 | C | 0 | $1234K |
| 20 | 90293 | Playa Del Rey | 55 | C | 0 | $972K |
| 21 | 91311 | Chatsworth | 55 | C | 0 | $837K |
| 22 | 91326 | Porter Ranch | 55 | C | 0 | $1011K |
| 23 | 90090 | Dodgertown | 53 | D | 0 | — |
| 24 | 90094 | Playa Vista | 53 | D | 0 | $1234K |
| 25 | 90231 | Culver City | 53 | D | 0 | — |
| 26 | 90233 | Culver City | 53 | D | 0 | — |
| 27 | 90295 | Marina Del Rey | 53 | D | 0 | — |
| 28 | 90296 | Playa Del Rey | 53 | D | 0 | — |
| 29 | 90733 | San Pedro | 53 | D | 0 | — |
| 30 | 90734 | San Pedro | 53 | D | 0 | — |
| 31 | 90748 | Wilmington | 53 | D | 0 | — |
| 32 | 90749 | Carson | 53 | D | 0 | — |
| 33 | 91313 | Chatsworth | 53 | D | 0 | — |
| 34 | 91608 | Universal City | 53 | D | 0 | — |
| 35 | 91610 | Toluca Lake | 53 | D | 0 | — |
| 36 | 92389 | Tecopa | 53 | D | 0 | — |
| 37 | 93064 | Brandeis | 53 | D | 0 | — |
| 38 | 93512 | Benton | 53 | D | 0 | $279K |
| 39 | 93549 | Olancha | 53 | D | 0 | $325K |
| 40 | 90069 | West Hollywood | 50 | D | 0 | $1086K |
| 41 | 91423 | Sherman Oaks | 50 | D | 0 | $1324K |
| 42 | 91604 | Studio City | 50 | D | 0 | $1699K |
Recommended Buyer Guides for Inyo County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 73.8% 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 Inyo County, California
Overview
Inyo County in California covers 42 ZIP codes with an average Home Safety Score of C (59/100).
8 of 42 ZIP codes have recorded EPA violations. 8 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.