Musselshell County, Montana
6 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-06-03
Within Musselshell County, safety data across 6 ZIP codes suggests a fair but uneven system — violations are present and worth checking at the ZIP level.
How Musselshell County Compares
How Musselshell County Compares
Musselshell County scores 6 points above the Montana state average (55/100) and 7 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Musselshell County, Montana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.6 (asthma 11.5%, diabetes 12.6%)
Estimated additional annual cost per homeowner: $1,080, driven primarily by wildfire
Infrastructure: 0.375% avg pipe failure probability, 50% of ZIPs at high risk
69.4% of homes built before 1978 (lead paint era)
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: $1,080
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,670 housing units in Musselshell 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 Musselshell County
Remediation costs are relatively manageable for most homeowners in Musselshell 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 Musselshell 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 Musselshell County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Melstone Town of | 170 | 3 |
| 2 | Roundup Water Department | 1,900 | 2 |
| 3 | Cmrwa Musselshell Judith Rural Water Sys | 1,100 | 2 |
| 4 | Sunset Colony Unapproved | 75 | 2 |
| 5 | Musselshell Community County Water Supply District | 75 | 0 |
All ZIP Codes in Musselshell County
6 ZIP codes tracked in Musselshell County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59059 | Musselshell | 83 | B | 0 | — |
| 2 | 59054 | Melstone | 80 | B | 3 | $184K |
| 3 | 59058 | Mosby | 53 | D | 0 | $244K |
| 4 | 59083 | Sumatra | 53 | D | 0 | — |
| 5 | 59073 | Roundup | 50 | D | 1 | — |
| 6 | 59072 | Roundup | 48 | D | 1 | $222K |
Recommended Buyer Guides for Musselshell County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Water Filters for Lead — Lead above EPA action level in 2 ZIP codes
- Best Lead Paint Test Kits — 69.4% 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 Musselshell County, Montana
Overview
Musselshell County in Montana covers 6 ZIP codes with an average Home Safety Score of C (61/100).
3 of 6 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.