Harding County, South Dakota
6 ZIP codes · Avg score 60/100 · Grade C · Updated 2026-06-03
Although much of Harding County meets baseline standards, some of its 6 ZIP codes show violations that merit closer attention.
How Harding County Compares
How Harding County Compares
Harding County scores 0 points above the South Dakota state average (60/100) and 8 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Harding 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: 12.8 (asthma 9.6%, diabetes 11.2%)
Estimated additional annual cost per homeowner: $720, driven primarily by water_lead
Infrastructure: 0.41% avg pipe failure probability, 80% of ZIPs at high risk
80.4% 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: $720
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
699 housing units in Harding 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 Harding County
Remediation costs are relatively manageable for most homeowners in Harding 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 Harding County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Harding County
6 ZIP codes tracked in Harding County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57720 | Buffalo | 83 | B | 0 | $129K |
| 2 | 57755 | Ludlow | 63 | C | 0 | $156K |
| 3 | 57650 | Ralph | 53 | D | 0 | — |
| 4 | 57651 | Reva | 53 | D | 0 | $310K |
| 5 | 57724 | Camp Crook | 53 | D | 0 | $215K |
| 6 | 57776 | Redig | 53 | D | 0 | — |
Recommended Buyer Guides for Harding County
Independent picks. EPA-grounded. Matched here.
- Best Lead Paint Test Kits — 80.4% of homes built before 1978
Deep Dive Reports
Detailed analysis for Harding County, South Dakota
Overview
Harding County in South Dakota covers 6 ZIP codes with an average Home Safety Score of C (60/100).
No EPA violations recorded across any tracked ZIP codes in Harding County.
← 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.