Petroleum County, Montana
1 ZIP code · Avg score 71/100 · Grade B · Updated 2026-06-04
Although county size varies, Petroleum County's 1 ZIP code share reliably safe tap water records and above-average compliance scores.
How Petroleum County Compares
How Petroleum County Compares
Petroleum County scores 16 points above the Montana state average (55/100) and 3 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 14.3 (asthma 10.5%, diabetes 12.4%)
Estimated additional annual cost per homeowner: $800, driven primarily by wildfire
Infrastructure: 0.42% avg pipe failure probability, 100% of ZIPs at high risk
61% 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: $800
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
262 housing units in Petroleum 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 Petroleum County
Remediation costs are relatively manageable for most homeowners in Petroleum 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 Petroleum County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Petroleum County
1 ZIP code tracked in Petroleum County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59087 | Winnett | 71 | B | 4 | $167K |
Recommended Buyer Guides for Petroleum 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 Lead Paint Test Kits — 61% of homes built before 1978
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Overview
Petroleum County in Montana covers 1 ZIP code with an average Home Safety Score of B (71/100).
1 of 1 ZIP code 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.