Marshall County, South Dakota
7 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-06-04
Based on current EPA data, Marshall County's 7 ZIP codes reflect fair but mixed water safety.
How Marshall County Compares
How Marshall County Compares
Marshall County scores 1 points above the South Dakota state average (60/100) and 7 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Marshall County, South Dakota
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.7 (asthma 9.8%, diabetes 12.7%)
Estimated additional annual cost per homeowner: $683, driven primarily by water_lead
Infrastructure: 0.427% avg pipe failure probability, 57% of ZIPs at high risk
78% 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: $683
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,481 housing units in Marshall 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 Marshall County
Remediation costs are relatively manageable for most homeowners in Marshall 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 Marshall 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 Marshall County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | BROWN-DAY-MARSHALL RWS | 5,673 | 7 |
| 2 | Eden | 94 | 4 |
| 3 | Britton | 1,215 | 2 |
| 4 | Peever | 164 | 2 |
| 5 | Sunset Colony | 140 | 2 |
9 total water systems serve Marshall County.
All ZIP Codes in Marshall County
7 ZIP codes tracked in Marshall County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57454 | Langford | 70 | B | 0 | $181K |
| 2 | 57430 | Britton | 69 | C | 2 | $118K |
| 3 | 57232 | Eden | 65 | C | 4 | $289K |
| 4 | 57270 | Veblen | 64 | C | 1 | $89K |
| 5 | 57247 | Lake City | 53 | D | 0 | $237K |
| 6 | 57421 | Amherst | 53 | D | 0 | — |
| 7 | 57432 | Claremont | 53 | D | 0 | $151K |
Recommended Buyer Guides for Marshall 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 — 78% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Marshall County, South Dakota
Overview
Marshall County in South Dakota covers 7 ZIP codes with an average Home Safety Score of C (61/100).
3 of 7 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to South 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.