Blaine County, Montana
5 ZIP codes · Avg score 41/100 · Grade D · Updated 2026-06-03
While Blaine County's situation varies by ZIP, its 5 ZIP codes collectively fall below the state average — addressing specific concerns starts with checking the system that serves a given address.
How Blaine County Compares
How Blaine County Compares
Blaine County scores 14 points below the Montana state average (55/100) and 27 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Blaine County, Montana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.4 (asthma 13.2%, diabetes 14.3%)
Estimated additional annual cost per homeowner: $1,318, driven primarily by flood
Infrastructure: 0.512% avg pipe failure probability, 80% of ZIPs at high risk
78.4% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Blaine County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 12 violations. Past 5 years: 39 total (39 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $1,318
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,380 housing units in Blaine 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 Blaine County
Remediation costs are relatively manageable for most homeowners in Blaine 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 Blaine 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 Blaine County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Harlem | 820 | 31 |
| 2 | North Harlem Colony | 42 | 31 |
| 3 | TURNER COLONY | 50 | 13 |
| 4 | City of Chinook | 1,300 | 6 |
| 5 | Perrys Water Service | 100 | 6 |
All ZIP Codes in Blaine County
5 ZIP codes tracked in Blaine County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 59547 | Zurich | 53 | D | 0 | $163K |
| 2 | 59523 | Chinook | 49 | D | 6 (4 health) | $201K |
| 3 | 59526 | Harlem | 40 | D | 31 (21 health) | $85K |
| 4 | 59529 | Hogeland | 40 | D | 0 | $263K |
| 5 | 59542 | Turner | 22 | F | 13 (9 health) | — |
Recommended Buyer Guides for Blaine County
Retailer arrangements don't shape what appears here — the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Lead Paint Test Kits — 78.4% 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 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 Blaine County, Montana
Overview
Blaine County in Montana covers 5 ZIP codes with an average Home Safety Score of D (41/100).
3 of 5 ZIP codes have recorded EPA violations. 34 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
Blaine 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
78.4% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.