Hamlin County, South Dakota
10 ZIP codes · Avg score 57/100 · Grade C · Updated 2026-06-03
Within Hamlin County, safety data across 10 ZIP codes suggests a fair but uneven system — violations are present and worth checking at the ZIP level.
How Hamlin County Compares
How Hamlin County Compares
Hamlin County scores 3 points below the South Dakota state average (60/100) and 11 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Hamlin 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: 12.5 (asthma 9.9%, diabetes 10.6%)
Estimated additional annual cost per homeowner: $1,472, driven primarily by flood
Infrastructure: 0.397% avg pipe failure probability, 40% of ZIPs at high risk
69.3% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Hamlin County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 5 violations. Past 5 years: 7 total (7 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: $1,472
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
19,035 housing units in Hamlin 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 Hamlin County
Remediation costs are relatively manageable for most homeowners in Hamlin 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 Hamlin 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 Hamlin County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Kingbrook I Rural Water System | 6,455 | 3 |
| 2 | Sioux Rural Water System | 4,012 | 3 |
| 3 | Sioux Falls | 216,462 | 2 |
| 4 | Valley View Estates | 230 | 2 |
| 5 | Minnehaha Community Water Corporation | 13,435 | 2 |
19 total water systems serve Hamlin County.
All ZIP Codes in Hamlin County
10 ZIP codes tracked in Hamlin County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57241 | Hayti | 70 | B | 0 | $137K |
| 2 | 57221 | Bryant | 65 | C | 1 (1 health) | $229K |
| 3 | 57103 | Sioux Falls | 61 | C | 2 (1 health) | $245K |
| 4 | 57212 | Arlington | 60 | C | 0 | $230K |
| 5 | 57248 | Lake Norden | 60 | C | 0 | $245K |
| 6 | 57223 | Castlewood | 59 | C | 1 (1 health) | $230K |
| 7 | 57234 | Estelline | 59 | C | 1 (1 health) | $170K |
| 8 | 57271 | Vienna | 53 | D | 0 | — |
| 9 | 57233 | Erwin | 40 | D | 0 | $280K |
| 10 | 57242 | Hazel | 40 | D | 0 | $216K |
Recommended Buyer Guides for Hamlin County
Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.
- Best Lead Paint Test Kits — 69.3% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Hamlin County, South Dakota
Overview
Hamlin County in South Dakota covers 10 ZIP codes with an average Home Safety Score of C (57/100).
4 of 10 ZIP codes have recorded EPA violations. 4 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.