Trinity County, California
10 ZIP codes · Avg score 81/100 · Grade B · Updated 2026-06-03
Recent water monitoring in Trinity County shows 10 ZIP codes with consistently safe results.
How Trinity County Compares
How Trinity County Compares
Trinity County scores 8 points above the California state average (73/100) and 13 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Trinity County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 16.2 (asthma 11%, diabetes 15.9%)
Estimated additional annual cost per homeowner: $4,922, driven primarily by sea_level
Infrastructure: 0.375% avg pipe failure probability, 30% of ZIPs at high risk
68.9% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Trinity County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 7 violations. Past 5 years: 11 total (11 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: $4,922
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
7,309 housing units in Trinity 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 Trinity County
Remediation costs are relatively manageable for most homeowners in Trinity 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 Trinity 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 Trinity County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | WEAVERVILLE C.S.D. | 3,975 | 10 |
| 2 | Trinity Village Mutual Water | 332 | 6 |
| 3 | Salyer Mutual Wc (formerly Riverview Ac) | 231 | 6 |
| 4 | Salyer Heights W.s., Inc. | 130 | 6 |
| 5 | Trinity Center M.w.c. . | 729 | 6 |
14 total water systems serve Trinity County.
All ZIP Codes in Trinity County
10 ZIP codes tracked in Trinity County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 95527 | Burnt Ranch | 94 | A | 2 (1 health) | $426K |
| 2 | 96052 | Lewiston | 94 | A | 4 (1 health) | $321K |
| 3 | 96048 | Junction City | 91 | A | 1 (1 health) | $401K |
| 4 | 96091 | Trinity Center | 87 | A | 6 (2 health) | $341K |
| 5 | 95563 | Salyer | 83 | B | 6 (3 health) | $581K |
| 6 | 96093 | Weaverville | 78 | B | 0 | $336K |
| 7 | 96024 | Douglas City | 73 | B | 0 | $370K |
| 8 | 96046 | Hyampom | 73 | B | 0 | — |
| 9 | 96010 | Big Bar | 66 | C | 0 | — |
| 10 | 96041 | Hayfork | 66 | C | 1 | $273K |
Recommended Buyer Guides for Trinity County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 68.9% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Trinity County, California
Overview
Trinity County in California covers 10 ZIP codes with an average Home Safety Score of B (81/100).
6 of 10 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.