Gregory County, South Dakota
7 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-03
Recent water monitoring in Gregory County shows 7 ZIP codes with consistently safe results.
How Gregory County Compares
How Gregory County Compares
Gregory County scores 10 points above the South Dakota state average (60/100) and 2 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Gregory 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: 14.8 (asthma 10.2%, diabetes 14.1%)
Estimated additional annual cost per homeowner: $611, driven primarily by water_lead
Infrastructure: 0.439% avg pipe failure probability, 86% of ZIPs at high risk
79% 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: $611
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,274 housing units in Gregory 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 Gregory County
Remediation costs are relatively manageable for most homeowners in Gregory 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 Gregory 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 Gregory County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | TRIPP COUNTY WATER USER DISTRICT | 4,860 | 0 |
| 2 | Bonesteel | 275 | 0 |
| 3 | Burke | 575 | 0 |
| 4 | Dallas | 89 | 0 |
| 5 | Gregory | 1,221 | 0 |
All ZIP Codes in Gregory County
7 ZIP codes tracked in Gregory County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57317 | Bonesteel | 83 | B | 0 | $120K |
| 2 | 57523 | Burke | 83 | B | 0 | $207K |
| 3 | 57529 | Dallas | 83 | B | 0 | $278K |
| 4 | 57533 | Gregory | 83 | B | 0 | $113K |
| 5 | 57335 | Fairfax | 53 | D | 0 | $121K |
| 6 | 57538 | Herrick | 53 | D | 0 | — |
| 7 | 57571 | Saint Charles | 53 | D | 0 | $73K |
Recommended Buyer Guides for Gregory County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 79% of homes built before 1978
Deep Dive Reports
Detailed analysis for Gregory County, South Dakota
Overview
Gregory County in South Dakota covers 7 ZIP codes with an average Home Safety Score of B (70/100).
No EPA violations recorded across any tracked ZIP codes in Gregory 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.