Treasure County, Montana
5 ZIP codes · Avg score 56/100 · Grade C · Updated 2026-06-03
Covering 5 ZIP codes, Treasure County falls in the average tier for tap water safety — violations appear in a meaningful share of areas, and the data suggests quality depends heavily on which specific part of the county a household sits in.
How Treasure County Compares
How Treasure County Compares
Treasure County scores 1 points above the Montana state average (55/100) and 12 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Treasure County, Montana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.2 (asthma 11.1%, diabetes 12.1%)
Estimated additional annual cost per homeowner: $740, driven primarily by wildfire
Infrastructure: 0.368% avg pipe failure probability, 20% of ZIPs at high risk
59.8% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Treasure County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 25 violations. Past 5 years: 35 total (35 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: $740
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
755 housing units in Treasure 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 Treasure County
Remediation costs are relatively manageable for most homeowners in Treasure 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 Treasure County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Treasure County
5 ZIP codes tracked in Treasure County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59024 | Custer | 63 | C | 0 | $191K |
| 2 | 59038 | Hysham | 56 | C | 17 (7 health) | $207K |
| 3 | 59010 | Bighorn | 53 | D | 0 | $288K |
| 4 | 59039 | Ingomar | 53 | D | 0 | — |
| 5 | 59076 | Sanders | 53 | D | 0 | $275K |
Recommended Buyer Guides for Treasure County
Retailer arrangements don't shape what appears here — the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Lead Paint Test Kits — 59.8% 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 Treasure County, Montana
Overview
Treasure County in Montana covers 5 ZIP codes with an average Home Safety Score of C (56/100).
1 of 5 ZIP codes have recorded EPA violations. 7 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.