Sullivan County, Missouri
8 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-03
In current tracking cycles, Sullivan County — spanning 8 ZIP codes — records above-average water quality outcomes; the county's compliance history over recent years shows few departures from federal standards.
How Sullivan County Compares
How Sullivan County Compares
Sullivan County scores 1 points above the Missouri state average (69/100) and 2 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Sullivan County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.5 (asthma 10.4%, diabetes 14.9%)
Estimated additional annual cost per homeowner: $556, driven primarily by water_lead
Infrastructure: 0.419% avg pipe failure probability, 63% of ZIPs at high risk
74.3% 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: $556
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,325 housing units in Sullivan 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 Sullivan County
Remediation costs are relatively manageable for most homeowners in Sullivan 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 Sullivan 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 Sullivan County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Sullivan County Pwsd 1 | 4,412 | 8 |
| 2 | Milan Public Water System | 1,819 | 5 |
| 3 | North Central Mo Regional Water Com | 25 | 5 |
| 4 | Green City Public Water System | 657 | 2 |
| 5 | Adair County Pwsd 1 | 7,500 | 1 |
9 total water systems serve Sullivan County.
All ZIP Codes in Sullivan County
8 ZIP codes tracked in Sullivan County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 64646 | Humphreys | 83 | B | 0 | $88K |
| 2 | 64667 | Newtown | 83 | B | 0 | $49K |
| 3 | 63545 | Green City | 82 | B | 2 (1 health) | $107K |
| 4 | 63556 | Milan | 82 | B | 5 (1 health) | $119K |
| 5 | 63544 | Green Castle | 67 | C | 1 | $145K |
| 6 | 63560 | Pollock | 53 | D | 0 | — |
| 7 | 64645 | Harris | 53 | D | 0 | $47K |
| 8 | 64655 | Lucerne | 53 | D | 0 | — |
Recommended Buyer Guides for Sullivan County
Retailer arrangements don't shape what appears here — the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Lead Paint Test Kits — 74.3% of homes built before 1978
Deep Dive Reports
Detailed analysis for Sullivan County, Missouri
Overview
Sullivan County in Missouri covers 8 ZIP codes with an average Home Safety Score of B (70/100).
3 of 8 ZIP codes have recorded EPA violations. 2 health-based violations have been documented.
← 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.