Madison County, Missouri
4 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-06-03
Covering 4 ZIP codes, Madison 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 Madison County Compares
How Madison County Compares
Madison County scores 3 points below the Missouri state average (69/100) and 2 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 15.9 (asthma 10.9%, diabetes 14.5%)
Estimated additional annual cost per homeowner: $1,263, driven primarily by flood
Infrastructure: 0.373% avg pipe failure probability, 33% of ZIPs at high risk
69.3% 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: $1,263
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,512 housing units in Madison 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 Madison County
Remediation costs are relatively manageable for most homeowners in Madison 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 Madison County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 3 systems in Madison County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Madison County Pwsd 1 North and South | 1,705 | 4 |
| 2 | MARQUAND PWS | 253 | 2 |
| 3 | Fredericktown Public Water System | 4,429 | 2 |
All ZIP Codes in Madison County
4 ZIP codes tracked in Madison County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 63655 | Marquand | 76 | B | 2 | $172K |
| 2 | 63645 | Fredericktown | 72 | B | 2 | $151K |
| 3 | 63662 | Patton | 63 | C | 0 | $107K |
| 4 | 63632 | Cascade | 53 | D | 0 | — |
Recommended Buyer Guides for Madison County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 69.3% of homes built before 1978
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Overview
Madison County in Missouri covers 4 ZIP codes with an average Home Safety Score of C (66/100).
2 of 4 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Missouri 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.