Audrain County, Missouri
14 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
The systems supplying Audrain County's 14 ZIP codes vary in performance — most meet minimum standards, but violations in select areas are on record.
How Audrain County Compares
How Audrain County Compares
Audrain County scores 10 points below the Missouri state average (69/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Audrain County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14 (asthma 10.7%, diabetes 12.5%)
Estimated additional annual cost per homeowner: $1,352, driven primarily by flood
Infrastructure: 0.367% avg pipe failure probability, 25% of ZIPs at high risk
65.3% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Audrain County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 1 violation. Past 5 years: 3 total (3 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: $1,352
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
100,751 housing units in Audrain 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 Audrain County
Remediation costs are relatively manageable for most homeowners in Audrain 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 Audrain 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 Audrain County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Monroe County Pwsd 2 | 6,677 | 21 |
| 2 | Laddonia Public Water System | 511 | 12 |
| 3 | MARTINSBURG PWS | 559 | 5 |
| 4 | CALLAWAY 2 WATER DISTRICT | 13,080 | 5 |
| 5 | Vandalia Public Water System | 3,140 | 4 |
15 total water systems serve Audrain County.
All ZIP Codes in Audrain County
14 ZIP codes tracked in Audrain County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 63352 | Laddonia | 81 | B | 12 (2 health) | $91K |
| 2 | 63345 | Farber | 78 | B | 4 (1 health) | $57K |
| 3 | 65264 | Martinsburg | 78 | B | 5 | $88K |
| 4 | 65265 | Mexico | 78 | B | 0 | $128K |
| 5 | 63382 | Vandalia | 75 | B | 0 | $91K |
| 6 | 63346 | Flinthill | 53 | D | 0 | — |
| 7 | 65232 | Benton City | 53 | D | 0 | $152K |
| 8 | 65280 | Rush Hill | 53 | D | 0 | — |
| 9 | 65285 | Thompson | 53 | D | 0 | $161K |
| 10 | 63302 | Saint Charles | 50 | D | 0 | — |
| 11 | 63304 | Saint Charles | 50 | D | 0 | $331K |
| 12 | 63303 | Saint Charles | 45 | D | 0 | $302K |
| 13 | 63376 | Saint Peters | 45 | D | 0 | $256K |
| 14 | 63301 | Saint Charles | 40 | D | 0 | $249K |
Recommended Buyer Guides for Audrain County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 65.3% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Audrain County, Missouri
Overview
Audrain County in Missouri covers 14 ZIP codes with an average Home Safety Score of C (59/100).
3 of 14 ZIP codes have recorded EPA violations. 3 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.