Corson County, South Dakota
4 ZIP codes · Avg score 47/100 · Grade D · Updated 2026-06-04
While Corson County's situation varies by ZIP, its 4 ZIP codes collectively fall below the state average — addressing specific concerns starts with checking the system that serves a given address.
How Corson County Compares
How Corson County Compares
Corson County scores 13 points below the South Dakota state average (60/100) and 21 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 18.1 (asthma 13.3%, diabetes 19.9%)
Estimated additional annual cost per homeowner: $688, driven primarily by water_lead
Infrastructure: 0.467% avg pipe failure probability, 75% of ZIPs at high risk
86.5% 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: $688
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
196 housing units in Corson 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 Corson County
Remediation costs are relatively manageable for most homeowners in Corson 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 Corson County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Corson County
4 ZIP codes tracked in Corson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57645 | Morristown | 69 | C | 10 (1 health) | $37K |
| 2 | 57634 | Keldron | 40 | D | 0 | $94K |
| 3 | 57659 | Walker | 40 | D | 0 | — |
| 4 | 57660 | Watauga | 40 | D | 0 | $102K |
Recommended Buyer Guides for Corson 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 — 86.5% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Overview
Corson County in South Dakota covers 4 ZIP codes with an average Home Safety Score of D (47/100).
1 of 4 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← 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.
What You Can Do
Corson 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
86.5% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.