Codington County, South Dakota
5 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03
Water systems across Codington County's 5 ZIP codes produce average compliance results overall — pockets with documented violations exist, and the variation between areas makes ZIP-level lookup the most useful tool for residents here.
How Codington County Compares
How Codington County Compares
Codington County scores 5 points below the South Dakota state average (60/100) and 13 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Codington 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: 13.4 (asthma 10.2%, diabetes 12.1%)
Estimated additional annual cost per homeowner: $1,102, driven primarily by flood
Infrastructure: 0.416% avg pipe failure probability, 60% of ZIPs at high risk
67.8% 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: $1,102
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
13,168 housing units in Codington 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 Codington County
Remediation costs are relatively manageable for most homeowners in Codington 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 Codington 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 Codington County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Sioux Rural Water System | 4,012 | 22 |
| 2 | Clark Rural Water System | 2,325 | 22 |
| 3 | Henry | 256 | 19 |
| 4 | GRANT-ROBERTS RURAL WATER SYSTEM | 5,050 | 2 |
| 5 | Watertown Municipal Utilities | 23,230 | 1 |
8 total water systems serve Codington County.
All ZIP Codes in Codington County
5 ZIP codes tracked in Codington County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57235 | Florence | 68 | C | 1 | $224K |
| 2 | 57243 | Henry | 66 | C | 19 (1 health) | $117K |
| 3 | 57201 | Watertown | 55 | C | 1 | $224K |
| 4 | 57263 | South Shore | 48 | D | 1 | $102K |
| 5 | 57245 | Kranzburg | 40 | D | 0 | $124K |
Recommended Buyer Guides for Codington County
Federal and certification sources drive the ordering: EPA monitoring data, NSF certifications, FEMA flood maps, and CDC lead guidance — guides surface only when county data warrants them.
- Best Lead Paint Test Kits — 67.8% of homes built before 1978
- 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 Codington County, South Dakota
Overview
Codington County in South Dakota covers 5 ZIP codes with an average Home Safety Score of C (55/100).
4 of 5 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.