Gallatin County, Montana
15 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-06-03
While Gallatin County avoids the worst tiers, a portion of its 15 ZIP codes have logged violations.
How Gallatin County Compares
How Gallatin County Compares
Gallatin County scores 7 points above the Montana state average (55/100) and 6 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Gallatin County, Montana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 9.4 (asthma 10.7%, diabetes 6.9%)
Estimated additional annual cost per homeowner: $679, driven primarily by flood
Infrastructure: 0.278% avg pipe failure probability
42.2% of homes built before 1978 (lead paint era)
Violation History (2022–2026)
↓ Improving trendEPA violation counts by year across Gallatin 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: $679
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
55,696 housing units in Gallatin 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 Gallatin County
Remediation costs are relatively manageable for most homeowners in Gallatin 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 Gallatin 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 Gallatin County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | North Star Zoot Water | 4,323 | 42 |
| 2 | Valley Grove Subdivision | 825 | 42 |
| 3 | City of Belgrade | 10,460 | 27 |
| 4 | River Rock County Water and Sewer District | 4,200 | 21 |
| 5 | Baxter Creek No 2 Hoa | 450 | 21 |
30 total water systems serve Gallatin County.
All ZIP Codes in Gallatin County
15 ZIP codes tracked in Gallatin County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59716 | Big Sky | 70 | B | 1 | $869K |
| 2 | 59730 | Gallatin Gateway | 70 | B | 1 | $818K |
| 3 | 59752 | Three Forks | 70 | B | 1 | $427K |
| 4 | 59758 | West Yellowstone | 67 | C | 4 | $477K |
| 5 | 59771 | Bozeman | 67 | C | 3 | — |
| 6 | 59741 | Manhattan | 65 | C | 10 | $562K |
| 7 | 59717 | Bozeman | 63 | C | 3 | — |
| 8 | 59719 | Bozeman | 63 | C | 3 | — |
| 9 | 59772 | Bozeman | 63 | C | 3 | — |
| 10 | 59773 | Bozeman | 63 | C | 3 | — |
| 11 | 59715 | Bozeman | 62 | C | 3 | $755K |
| 12 | 59718 | Bozeman | 62 | C | 3 | $580K |
| 13 | 59714 | Belgrade | 56 | C | 21 | $490K |
| 14 | 59721 | Cardwell | 53 | D | 0 | $616K |
| 15 | 59760 | Willow Creek | 40 | D | 0 | $239K |
Recommended Buyer Guides for Gallatin County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- 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 Gallatin County, Montana
Overview
Gallatin County in Montana covers 15 ZIP codes with an average Home Safety Score of C (62/100).
13 of 15 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.