Clinton County, Iowa
18 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-06-03
Covering 18 ZIP codes, Clinton County falls in the average tier for tap water safety — violations appear in a meaningful share of areas, and the data suggests quality depends heavily on which specific part of the county a household sits in.
How Clinton County Compares
How Clinton County Compares
Clinton County scores 3 points above the Iowa state average (59/100) and 6 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Clinton County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.4 (asthma 10.2%, diabetes 12.7%)
Estimated additional annual cost per homeowner: $794, driven primarily by energy_code_gap
Infrastructure: 0.437% avg pipe failure probability, 67% of ZIPs at high risk
78.9% 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: $794
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
21,343 housing units in Clinton 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 Clinton County
Remediation costs are relatively manageable for most homeowners in Clinton 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 Clinton 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 Clinton County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Lost Nation Water Supply | 434 | 4 |
| 2 | Andover Water Supply | 109 | 2 |
| 3 | Calamus Water Supply | 356 | 2 |
| 4 | Stockton Muni Water Supply | 176 | 2 |
| 5 | Maysville Municipal Water Department | 156 | 2 |
19 total water systems serve Clinton County.
All ZIP Codes in Clinton County
18 ZIP codes tracked in Clinton County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 52733 | Clinton | 70 | B | 0 | — |
| 2 | 52742 | De Witt | 70 | B | 0 | $241K |
| 3 | 52774 | Welton | 70 | B | 0 | $115K |
| 4 | 52729 | Calamus | 68 | C | 2 | $164K |
| 5 | 52777 | Wheatland | 68 | C | 1 | $143K |
| 6 | 52037 | Delmar | 66 | C | 0 | $188K |
| 7 | 52734 | Clinton | 66 | C | 0 | — |
| 8 | 52736 | Clinton | 66 | C | 0 | — |
| 9 | 52750 | Goose Lake | 66 | C | 1 | $178K |
| 10 | 52757 | Low Moor | 66 | C | 0 | $120K |
| 11 | 52731 | Charlotte | 65 | C | 0 | $135K |
| 12 | 52254 | Lost Nation | 61 | C | 4 | $97K |
| 13 | 52701 | Andover | 61 | C | 2 | $115K |
| 14 | 52730 | Camanche | 60 | C | 0 | $176K |
| 15 | 52732 | Clinton | 60 | C | 0 | $119K |
| 16 | 52751 | Grand Mound | 58 | C | 0 | $169K |
| 17 | 52727 | Bryant | 40 | D | 0 | $240K |
| 18 | 52771 | Teeds Grove | 40 | D | 0 | — |
Recommended Buyer Guides for Clinton County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 78.9% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Clinton County, Iowa
Overview
Clinton County in Iowa covers 18 ZIP codes with an average Home Safety Score of C (62/100).
5 of 18 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.