Dickinson County, Iowa
7 ZIP codes · Avg score 67/100 · Grade C · Updated 2026-06-03
Based on current EPA data, Dickinson County's 7 ZIP codes reflect fair but mixed water safety.
How Dickinson County Compares
How Dickinson County Compares
Dickinson County scores 8 points above the Iowa state average (59/100) and 1 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Dickinson County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.9 (asthma 9.7%, diabetes 12.1%)
Estimated additional annual cost per homeowner: $700, driven primarily by energy_code_gap
Infrastructure: 0.441% avg pipe failure probability, 57% of ZIPs at high risk
68.3% 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: $700
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
13,835 housing units in Dickinson 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 Dickinson County
Remediation costs are relatively manageable for most homeowners in Dickinson 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 Dickinson 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 Dickinson County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Milford Municipal Utilities | 3,321 | 4 |
| 2 | Terril Municipal Waterworks | 334 | 3 |
| 3 | Arnolds Park Water Department | 1,110 | 1 |
| 4 | Okoboji Water Supply | 768 | 1 |
| 5 | Wahpeton Water Supply | 408 | 1 |
10 total water systems serve Dickinson County.
All ZIP Codes in Dickinson County
7 ZIP codes tracked in Dickinson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 51351 | Milford | 70 | B | 0 | $256K |
| 2 | 51355 | Okoboji | 70 | B | 0 | $441K |
| 3 | 51331 | Arnolds Park | 66 | C | 0 | $416K |
| 4 | 51347 | Lake Park | 66 | C | 0 | $181K |
| 5 | 51363 | Superior | 66 | C | 0 | $74K |
| 6 | 51364 | Terril | 65 | C | 3 | $132K |
| 7 | 51360 | Spirit Lake | 64 | C | 1 (1 health) | $256K |
Recommended Buyer Guides for Dickinson County
Methodologically, the recommendation order reflects severity in the federal record: contaminants flagged in EPA detection records for this county outrank generic water concerns, FEMA-confirmed hazard ratings shift emergency-related categories upward, and CDC lead-exposure markers govern when lead-test kits and certified filters appear at the top of the list.
- Best Lead Paint Test Kits — 68.3% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Dickinson County, Iowa
Overview
Dickinson County in Iowa covers 7 ZIP codes with an average Home Safety Score of C (67/100).
2 of 7 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← Back to Iowa 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.