Cavalier County, North Dakota
17 ZIP codes · Avg score 50/100 · Grade D · Updated 2026-06-04
Of 17 ZIP codes in Cavalier County, a meaningful portion have recorded health-based violations in recent monitoring periods — placing the county in the lower tier for water safety.
How Cavalier County Compares
How Cavalier County Compares
Cavalier County scores 6 points below the North Dakota state average (56/100) and 18 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Cavalier County, North Dakota
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.2 (asthma 10.2%, diabetes 12.3%)
Estimated additional annual cost per homeowner: $871, driven primarily by water_lead
Infrastructure: 0.423% avg pipe failure probability, 75% of ZIPs at high risk
83.7% 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: $871
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,618 housing units in Cavalier 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 Cavalier County
Water safety remediation is a moderate expense relative to home values. Most homeowners can address issues through staged improvements over time.
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 Cavalier 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 Cavalier County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | NEKOMA CITY OF | 50 | 5 |
| 2 | NORTHEAST RWD-LANGDON BRANCH | 2,450 | 3 |
| 3 | City of Langdon | 1,878 | 3 |
| 4 | Walsh Rural Water District | 3,000 | 0 |
| 5 | TRI-COUNTY WATER DISTRICT | 2,501 | 0 |
11 total water systems serve Cavalier County.
All ZIP Codes in Cavalier County
17 ZIP codes tracked in Cavalier County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 58249 | Langdon | 69 | C | 3 | $145K |
| 2 | 58269 | Osnabrock | 66 | C | 0 | $55K |
| 3 | 58355 | Nekoma | 65 | C | 2 | $63K |
| 4 | 58210 | Adams | 53 | D | 0 | $89K |
| 5 | 58241 | Hensel | 53 | D | 0 | $98K |
| 6 | 58281 | Wales | 53 | D | 0 | $77K |
| 7 | 58327 | Crary | 53 | D | 0 | $186K |
| 8 | 58362 | Penn | 53 | D | 0 | — |
| 9 | 58379 | Tokio | 53 | D | 0 | — |
| 10 | 58382 | Webster | 53 | D | 0 | — |
| 11 | 58229 | Fairdale | 40 | D | 0 | $107K |
| 12 | 58236 | Glasston | 40 | D | 0 | — |
| 13 | 58239 | Hannah | 40 | D | 0 | $93K |
| 14 | 58255 | Maida | 40 | D | 0 | — |
| 15 | 58311 | Alsen | 40 | D | 0 | $94K |
| 16 | 58323 | Calvin | 40 | D | 0 | — |
| 17 | 58370 | Saint Michael | 40 | D | 0 | $83K |
Recommended Buyer Guides for Cavalier County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 83.7% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Cavalier County, North Dakota
Overview
Cavalier County in North Dakota covers 17 ZIP codes with an average Home Safety Score of D (50/100).
2 of 17 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to North Dakota 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
Cavalier 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
83.7% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.