Granite County, Montana
3 ZIP codes · Avg score 42/100 · Grade D · Updated 2026-06-03
Granite County's water safety record falls below average — health-based violations are on file in a notable share of the county's 3 ZIP codes, and several systems have recorded exceedances that trigger federal notification requirements.
How Granite County Compares
How Granite County Compares
Granite County scores 13 points below the Montana state average (55/100) and 26 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 14.2 (asthma 10.9%, diabetes 12.3%)
Estimated additional annual cost per homeowner: $757, driven primarily by wildfire
Infrastructure: 0.407% avg pipe failure probability, 33% of ZIPs at high risk
55% of homes built before 1978 (lead paint era)
Violation History (2024–2026)
→ Stable trendEPA violation counts by year across Granite County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 36 violations. Past 5 years: 45 total (45 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: $757
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
1,746 housing units in Granite 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 Granite County
Remediation costs are relatively manageable for most homeowners in Granite 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 Granite County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Granite County
3 ZIP codes tracked in Granite County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59832 | Drummond | 53 | D | 0 | $303K |
| 2 | 59837 | Hall | 40 | D | 0 | $342K |
| 3 | 59858 | Philipsburg | 33 | F | 15 (15 health) | $350K |
Recommended Buyer Guides for Granite County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 55% of homes built before 1978
- 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
Overview
Granite County in Montana covers 3 ZIP codes with an average Home Safety Score of D (42/100).
1 of 3 ZIP codes have recorded EPA violations. 15 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.
What You Can Do
Granite County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
55% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.