Lincoln County, Montana
8 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-06-03
Within Lincoln County, safety data across 8 ZIP codes suggests a fair but uneven system — violations are present and worth checking at the ZIP level.
How Lincoln County Compares
How Lincoln County Compares
Lincoln County scores 3 points above the Montana state average (55/100) and 10 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Lincoln County, Montana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.4 (asthma 11.3%, diabetes 13.4%)
Estimated additional annual cost per homeowner: $894, driven primarily by wildfire
Infrastructure: 0.33% avg pipe failure probability, 25% of ZIPs at high risk
49.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↓ Improving trendEPA violation counts by year across Lincoln County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 2 violations. Past 5 years: 5 total (5 health-based). Health-based violations are declining versus the prior 2-year window.
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: $894
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
11,379 housing units in Lincoln 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 Lincoln County
Remediation costs are relatively manageable for most homeowners in Lincoln 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 Lincoln 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 Lincoln County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Barnaby Lake Hoa | 75 | 8 |
| 2 | Eureka Town of | 1,995 | 6 |
| 3 | Indian Springs Ranch Sub | 455 | 6 |
| 4 | Carpenter Lake Hoa | 65 | 6 |
| 5 | Creekside Motel Rv and Trlr Pk | 35 | 6 |
16 total water systems serve Lincoln County.
All ZIP Codes in Lincoln County
8 ZIP codes tracked in Lincoln County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59935 | Troy | 70 | B | 0 | $279K |
| 2 | 59917 | Eureka | 67 | C | 6 | $295K |
| 3 | 59930 | Rexford | 66 | C | 0 | $252K |
| 4 | 59918 | Fortine | 65 | C | 2 | $287K |
| 5 | 59923 | Libby | 62 | C | 6 (3 health) | $241K |
| 6 | 59928 | Polebridge | 53 | D | 0 | — |
| 7 | 59933 | Stryker | 40 | D | 0 | — |
| 8 | 59934 | Trego | 40 | D | 0 | $302K |
Recommended Buyer Guides for Lincoln County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Lincoln County, Montana
Overview
Lincoln County in Montana covers 8 ZIP codes with an average Home Safety Score of C (58/100).
3 of 8 ZIP codes have recorded EPA violations. 3 health-based violations have been documented.
← Back to Montana 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.