Missoula County, Montana
18 ZIP codes · Avg score 65/100 · Grade C · Updated
ZipCheckup grade for Missoula County: C.
A mixed picture - some signals here are worth your attention.
Missoula County's water quality grade reflects a middle-ground assessment - its 18 ZIP codes range from fully compliant to violation-flagged.
How Missoula County Compares
How Missoula County Compares
Missoula County scores 0 points above the Montana state average (65/100) and 8 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: Missoula County, Montana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.5 (asthma 10.7%, diabetes 8.3%)
Estimated additional annual cost per homeowner: $1,185, driven primarily by flood
46.2% of homes built before 1978 (lead paint era)
Violation History (2023–2024)
→ Stable trendEPA violation counts by year across Missoula County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 2 violations. Past 5 years: 3 total (3 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
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,185
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
59,479 housing units in Missoula 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 Missoula County
Remediation costs are relatively manageable for most homeowners in Missoula 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 Missoula County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Missoula County
8 community water systems serving Missoula County.
- C
- C
- C
- C
Show all 8 water systems
- C
17 total water systems serve Missoula County.
Systems with the most violations in Missoula County
5 water systems with recorded EPA violations.
- C
All ZIP Codes in Missoula County
18 ZIP codes tracked in Missoula County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59812 | Missoula | 67 | C | 0 | — |
| 2 | 59834 | Frenchtown | 67 | C | 0 | $400K |
| 3 | 59802 | Missoula | 66 | C | 2 | $420K |
| 4 | 59803 | Missoula | 66 | C | 2 | $493K |
| 5 | 59801 | Missoula | 65 | C | 1 | $393K |
| 6 | 59808 | Missoula | 60 | C | 21 | $420K |
| 7 | 59804 | Missoula | — | — | 4 | $507K |
| 8 | 59806 | Missoula | — | — | — | |
| 9 | 59807 | Missoula | — | — | — | |
| 10 | 59820 | Alberton | — | — | $332K | |
| 11 | 59823 | Bonner | — | — | 0 | $466K |
| 12 | 59826 | Condon | — | — | $492K | |
| 13 | 59833 | Florence | — | — | 2 | $487K |
| 14 | 59846 | Huson | — | — | $398K | |
| 15 | 59847 | Lolo | — | — | 2 | $367K |
| 16 | 59851 | Milltown | — | — | $362K | |
| 17 | 59864 | Ronan | — | — | 10 (2 health) | $272K |
| 18 | 59868 | Seeley Lake | — | — | $287K |
Recommended Buyer Guides for Missoula 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 PFAS — PFAS detected in 1 ZIP code
- 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 Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Missoula County, Montana
Overview
Missoula County in Montana covers 18 tracked ZIP records with an average Home Safety Score of C (65/100) across 6 scored records.
8 of 11 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 2 health-based violations appear in the available health breakdown.
← Back to Montana Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.