Modoc County, California
9 ZIP codes · Avg score 78/100 · Grade B · Updated 2026-06-03
Within Modoc County, all 9 tracked ZIP codes show above-average drinking water safety — violations are infrequent and typically minor.
How Modoc County Compares
How Modoc County Compares
Modoc County scores 5 points above the California state average (73/100) and 10 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Modoc County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.1 (asthma 10.8%, diabetes 14.9%)
Estimated additional annual cost per homeowner: $1,129, driven primarily by energy_code_gap
Infrastructure: 0.403% avg pipe failure probability, 56% of ZIPs at high risk
75.6% of homes built before 1978 (lead paint era)
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: $1,129
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,822 housing units in Modoc 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 Modoc County
Remediation costs are relatively manageable for most homeowners in Modoc 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 Modoc 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 Modoc County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Tulelake, | 856 | 7 |
| 2 | Newell County Water District | 629 | 7 |
| 3 | City of Alturas | 2,715 | 4 |
| 4 | California Pines C.s.d. | 862 | 4 |
| 5 | Isot Community Water System | 116 | 0 |
6 total water systems serve Modoc County.
All ZIP Codes in Modoc County
9 ZIP codes tracked in Modoc County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 96015 | Canby | 99 | A | 0 | — |
| 2 | 96104 | Cedarville | 99 | A | 0 | $248K |
| 3 | 96101 | Alturas | 89 | A | 4 (2 health) | $192K |
| 4 | 96134 | Tulelake | 89 | A | 7 (2 health) | $163K |
| 5 | 96108 | Davis Creek | 66 | C | 0 | — |
| 6 | 96110 | Eagleville | 66 | C | 0 | $218K |
| 7 | 96112 | Fort Bidwell | 66 | C | 0 | $194K |
| 8 | 96115 | Lake City | 66 | C | 0 | $289K |
| 9 | 96116 | Likely | 66 | C | 0 | — |
Recommended Buyer Guides for Modoc 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 — 75.6% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Modoc County, California
Overview
Modoc County in California covers 9 ZIP codes with an average Home Safety Score of B (78/100).
2 of 9 ZIP codes have recorded EPA violations. 4 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.