St. Clair County, Missouri
6 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-06-03
Covering 6 ZIP codes, St. Clair County earns a high grade for tap water — most systems report zero health-based violations, and the overall compliance rate comfortably exceeds federal benchmarks.
How St. Clair County Compares
How St. Clair County Compares
St. Clair County scores 4 points above the Missouri state average (69/100) and 5 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: St. Clair County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 16.9 (asthma 10.8%, diabetes 16.2%)
Estimated additional annual cost per homeowner: $385, driven primarily by water_lead
Infrastructure: 0.398% avg pipe failure probability, 40% of ZIPs at high risk
70.8% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across St. Clair County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 1 violation. Past 5 years: 2 total (2 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
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: $385
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,733 housing units in St. Clair 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 St. Clair County
Remediation costs are relatively manageable for most homeowners in St. Clair 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 St. Clair 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 St. Clair County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Harry S Truman Pwsd 2 | 2,700 | 4 |
| 2 | Bates County Pwsd 6 | 1,613 | 2 |
| 3 | Bates County Pwsd 7 | 500 | 2 |
| 4 | Appleton City Public Water System | 1,518 | 2 |
| 5 | Lowry City Public Water System | 640 | 2 |
7 total water systems serve St. Clair County.
All ZIP Codes in St. Clair County
6 ZIP codes tracked in St. Clair County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 64738 | Collins | 83 | B | 1 | $181K |
| 2 | 64724 | Appleton City | 82 | B | 2 (1 health) | $108K |
| 3 | 64763 | Lowry City | 81 | B | 2 | $142K |
| 4 | 64776 | Osceola | 68 | C | 0 | $141K |
| 5 | 64789 | Osceola | 68 | C | 0 | — |
| 6 | 64781 | Roscoe | 53 | D | 0 | $71K |
Recommended Buyer Guides for St. Clair County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Lead Paint Test Kits — 70.8% of homes built before 1978
Deep Dive Reports
Detailed analysis for St. Clair County, Missouri
Overview
St. Clair County in Missouri covers 6 ZIP codes with an average Home Safety Score of B (73/100).
3 of 6 ZIP codes have recorded EPA violations. 1 health-based violation 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.