Montgomery County, Missouri
9 ZIP codes · Avg score 78/100 · Grade B · Updated 2026-06-04
EPA monitoring reports for Montgomery County cover 9 ZIP codes and tell a largely reassuring story — compliance rates are high and health-based violations are far below the national norm.
How Montgomery County Compares
How Montgomery County Compares
Montgomery County scores 9 points above the Missouri state average (69/100) and 10 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Montgomery 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 (asthma 10.8%, diabetes 13.5%)
Estimated additional annual cost per homeowner: $652, driven primarily by flood
Infrastructure: 0.362% avg pipe failure probability, 25% of ZIPs at high risk
51.5% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
↑ Worsening trendEPA violation counts by year across Montgomery County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 7 violations. Past 5 years: 12 total (12 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $652
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
11,850 housing units in Montgomery 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 Montgomery County
Remediation costs are relatively manageable for most homeowners in Montgomery 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 Montgomery 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 Montgomery County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Montgomery Company Pwsd 1 | 3,850 | 18 |
| 2 | Monroe County Pwsd 2 | 6,677 | 14 |
| 3 | St Charles County Pwsd 2 Warren | 1,192 | 8 |
| 4 | Warrenton Public Water System | 8,208 | 8 |
| 5 | Troy Public Water System | 12,500 | 8 |
19 total water systems serve Montgomery County.
All ZIP Codes in Montgomery County
9 ZIP codes tracked in Montgomery County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 63350 | High Hill | 83 | B | 0 | — |
| 2 | 63351 | Jonesburg | 83 | B | 0 | $208K |
| 3 | 63361 | Montgomery City | 83 | B | 0 | $180K |
| 4 | 63333 | Bellflower | 82 | B | 2 | $89K |
| 5 | 63359 | Middletown | 81 | B | 6 (2 health) | $173K |
| 6 | 63383 | Warrenton | 77 | B | 8 (1 health) | $228K |
| 7 | 63384 | Wellsville | 77 | B | 6 | $113K |
| 8 | 65069 | Rhineland | 72 | B | 2 | $174K |
| 9 | 63370 | Olney | 63 | C | 0 | — |
Recommended Buyer Guides for Montgomery County
Federal and certification sources drive the ordering: EPA monitoring data, NSF certifications, FEMA flood maps, and CDC lead guidance — guides surface only when county data warrants them.
- Best Lead Paint Test Kits — 51.5% 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 Montgomery County, Missouri
Overview
Montgomery County in Missouri covers 9 ZIP codes with an average Home Safety Score of B (78/100).
5 of 9 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.