Mellette County, South Dakota
8 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-06-03
Water safety in Mellette County is uneven — some of its 8 ZIP codes meet standards cleanly while others carry documented violations.
How Mellette County Compares
How Mellette County Compares
Mellette County scores 2 points below the South Dakota state average (60/100) and 10 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Mellette 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: 19.2 (asthma 14.5%, diabetes 20.9%)
Estimated additional annual cost per homeowner: $619, driven primarily by wildfire
Infrastructure: 0.364% avg pipe failure probability, 13% of ZIPs at high risk
67.1% 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: $619
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,345 housing units in Mellette 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 Mellette County
Remediation costs are relatively manageable for most homeowners in Mellette 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 Mellette County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Mellette County
8 ZIP codes tracked in Mellette County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57579 | White River | 82 | B | 2 (1 health) | $59K |
| 2 | 57555 | Mission | 63 | C | 0 | $74K |
| 3 | 57560 | Norris | 53 | D | 0 | — |
| 4 | 57563 | Okreek | 53 | D | 0 | — |
| 5 | 57566 | Parmelee | 53 | D | 0 | $10K |
| 6 | 57570 | Rosebud | 53 | D | 0 | $45K |
| 7 | 57572 | Saint Francis | 53 | D | 0 | $35K |
| 8 | 57585 | Wood | 53 | D | 0 | $104K |
Recommended Buyer Guides for Mellette County
Designed to find the guide that fits the county, not the other way around — the system reads EPA detections, FEMA hazard layers, and CDC lead-exposure markers, then outputs the categories that resolve those specific risks for households here, with NSF-certified products surfaced when the matching contaminant appears in the local monitoring data.
- Best Lead Paint Test Kits — 67.1% of homes built before 1978
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Mellette County, South Dakota
Overview
Mellette County in South Dakota covers 8 ZIP codes with an average Home Safety Score of C (58/100).
1 of 8 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.