Fall River County, South Dakota
6 ZIP codes · Avg score 71/100 · Grade B · Updated 2026-06-04
Spanning 6 ZIP codes, Fall River County posts strong drinking water compliance — most systems have never triggered a health-based notice.
How Fall River County Compares
How Fall River County Compares
Fall River County scores 11 points above the South Dakota state average (60/100) and 3 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Fall River 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: 16.7 (asthma 11.2%, diabetes 17.2%)
Estimated additional annual cost per homeowner: $842, driven primarily by wildfire
Infrastructure: 0.382% avg pipe failure probability, 50% of ZIPs at high risk
65.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Fall River County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 2 violations. Past 5 years: 4 total (4 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
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: $842
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
5,135 housing units in Fall River 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 Fall River County
Remediation costs are relatively manageable for most homeowners in Fall River 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 Fall River 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 Fall River County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Fall River Wud | 1,057 | 22 |
| 2 | Southern Black Hills Water | 492 | 22 |
| 3 | Edgemont | 725 | 17 |
| 4 | Provo Area Water System | 25 | 17 |
| 5 | Oelrichs | 117 | 2 |
9 total water systems serve Fall River County.
All ZIP Codes in Fall River County
6 ZIP codes tracked in Fall River County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57747 | Hot Springs | 83 | B | 1 | $196K |
| 2 | 57763 | Oelrichs | 82 | B | 2 | $115K |
| 3 | 57766 | Oral | 81 | B | 2 | — |
| 4 | 57735 | Edgemont | 76 | B | 17 (3 health) | $118K |
| 5 | 57764 | Oglala | 53 | D | 0 | $41K |
| 6 | 57782 | Smithwick | 53 | D | 0 | $259K |
Recommended Buyer Guides for Fall River 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 — 65.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Fall River County, South Dakota
Overview
Fall River County in South Dakota covers 6 ZIP codes with an average Home Safety Score of B (71/100).
4 of 6 ZIP codes have recorded EPA violations. 3 health-based violations 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.