Cass County, North Dakota
37 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-06-03
Although much of Cass County meets baseline standards, some of its 37 ZIP codes show violations that merit closer attention.
How Cass County Compares
How Cass County Compares
Cass County scores 2 points above the North Dakota state average (56/100) and 10 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Cass 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: 10.6 (asthma 9.8%, diabetes 8.1%)
Estimated additional annual cost per homeowner: $1,042, driven primarily by flood
Infrastructure: 0.385% avg pipe failure probability, 39% of ZIPs at high risk
66.7% 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: $1,042
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
86,704 housing units in Cass 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 Cass County
Remediation costs are relatively manageable for most homeowners in Cass 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 Cass 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 Cass County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Amenia | 94 | 4 |
| 2 | EAST CENTRAL REGIONAL WD-GF | 5,995 | 4 |
| 3 | City of Grandin | 173 | 4 |
| 4 | City of Davenport | 252 | 3 |
| 5 | HUNTER CITY OF | 261 | 3 |
30 total water systems serve Cass County.
All ZIP Codes in Cass County
37 ZIP codes tracked in Cass County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 58105 | Fargo | 70 | B | 0 | — |
| 2 | 58108 | Fargo | 70 | B | 0 | — |
| 3 | 58109 | Fargo | 70 | B | 0 | — |
| 4 | 58121 | Fargo | 70 | B | 0 | — |
| 5 | 58124 | Fargo | 70 | B | 0 | — |
| 6 | 58004 | Amenia | 68 | C | 4 | $177K |
| 7 | 58048 | Hunter | 67 | C | 3 | $167K |
| 8 | 58064 | Page | 66 | C | 0 | $261K |
| 9 | 58071 | Tower City | 66 | C | 0 | $192K |
| 10 | 58106 | Fargo | 66 | C | 0 | — |
| 11 | 58122 | Fargo | 66 | C | 0 | — |
| 12 | 58125 | Fargo | 66 | C | 0 | — |
| 13 | 58126 | Fargo | 66 | C | 0 | — |
| 14 | 58059 | Mapleton | 65 | C | 0 | $293K |
| 15 | 58107 | Fargo | 65 | C | 0 | — |
| 16 | 58021 | Davenport | 64 | C | 3 (1 health) | $242K |
| 17 | 58036 | Gardner | 64 | C | 3 | $277K |
| 18 | 58038 | Grandin | 63 | C | 4 | $188K |
| 19 | 58011 | Buffalo | 62 | C | 2 | $235K |
| 20 | 58040 | Gwinner | 62 | C | 0 | $179K |
| 21 | 58005 | Argusville | 60 | C | 0 | $366K |
| 22 | 58051 | Kindred | 60 | C | 0 | $319K |
| 23 | 58102 | Fargo | 55 | C | 0 | $236K |
| 24 | 58103 | Fargo | 55 | C | 0 | $239K |
| 25 | 58052 | Leonard | 53 | D | 0 | $228K |
| 26 | 58079 | Wheatland | 53 | D | 0 | $290K |
| 27 | 58012 | Casselton | 52 | D | 0 | $308K |
| 28 | 58047 | Horace | 52 | D | 3 | $418K |
| 29 | 58042 | Harwood | 51 | D | 1 | $334K |
| 30 | 58006 | Arthur | 50 | D | 0 | $241K |
| 31 | 58104 | Fargo | 50 | D | 0 | $346K |
| 32 | 58078 | West Fargo | 47 | D | 0 | $303K |
| 33 | 58002 | Absaraka | 40 | D | 0 | — |
| 34 | 58007 | Ayr | 40 | D | 0 | $300K |
| 35 | 58029 | Erie | 40 | D | 0 | $417K |
| 36 | 58035 | Galesburg | 40 | D | 0 | $238K |
| 37 | 58065 | Pillsbury | 40 | D | 0 | $163K |
Recommended Buyer Guides for Cass 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 — 66.7% of homes built before 1978
- 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 Cass County, North Dakota
Overview
Cass County in North Dakota covers 37 ZIP codes with an average Home Safety Score of C (58/100).
8 of 37 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← 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.