Mahnomen County, Minnesota
4 ZIP codes · Avg score 53/100 · Grade D · Updated 2026-06-03
Within Mahnomen County's 4 monitored ZIP codes, water quality data indicates below-average safety — independent testing is a reasonable precaution.
How Mahnomen County Compares
How Mahnomen County Compares
Mahnomen County scores 9 points below the Minnesota state average (62/100) and 15 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 16.8 (asthma 12.5%, diabetes 16.8%)
Estimated additional annual cost per homeowner: $1,198, driven primarily by energy_code_gap
Infrastructure: 0.387% avg pipe failure probability, 25% of ZIPs at high risk
66.5% 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: $1,198
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,850 housing units in Mahnomen 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 Mahnomen County
Remediation costs are relatively manageable for most homeowners in Mahnomen 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 Mahnomen County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 3 systems in Mahnomen County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Bejou | 76 | 4 |
| 2 | Mahnomen | 1,210 | 0 |
| 3 | Waubun | 404 | 0 |
All ZIP Codes in Mahnomen County
4 ZIP codes tracked in Mahnomen County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 56557 | Mahnomen | 62 | C | 0 | $121K |
| 2 | 56589 | Waubun | 57 | C | 0 | $208K |
| 3 | 56516 | Bejou | 52 | D | 4 | $183K |
| 4 | 56566 | Naytahwaush | 40 | D | 0 | $109K |
Recommended Buyer Guides for Mahnomen County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 66.5% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Overview
Mahnomen County in Minnesota covers 4 ZIP codes with an average Home Safety Score of D (53/100).
1 of 4 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Minnesota 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
Mahnomen 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
66.5% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.