Lewis County, Missouri
10 ZIP codes · Avg score 70/100 · Grade B · Updated 2026-06-03
Lewis County earns a high water safety grade — 10 ZIP codes tracked, virtually all compliant.
How Lewis County Compares
How Lewis County Compares
Lewis 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: Lewis County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.1 (asthma 11%, diabetes 13.4%)
Estimated additional annual cost per homeowner: $765, driven primarily by flood
Infrastructure: 0.394% avg pipe failure probability, 40% of ZIPs at high risk
68.6% 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: $765
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
5,157 housing units in Lewis 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 Lewis County
Remediation costs are relatively manageable for most homeowners in Lewis 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 Lewis 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 Lewis County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Clark County Cons Pwsd 1 | 7,140 | 10 |
| 2 | Knox County Public Water & Sewer District 1 | 3,947 | 5 |
| 3 | LEWIS COUNTY PWSD 1 | 1,688 | 5 |
| 4 | MARION COUNTY PWSD 1 | 4,900 | 5 |
| 5 | Lagrange Public Water System | 874 | 3 |
9 total water systems serve Lewis County.
All ZIP Codes in Lewis County
10 ZIP codes tracked in Lewis County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 63452 | Lewistown | 83 | B | 0 | $88K |
| 2 | 63440 | Ewing | 82 | B | 2 | $128K |
| 3 | 63473 | Williamstown | 82 | B | 2 | $165K |
| 4 | 63435 | Canton | 73 | B | 1 | $134K |
| 5 | 63448 | La Grange | 72 | B | 3 (1 health) | $119K |
| 6 | 63447 | La Belle | 64 | C | 2 | $85K |
| 7 | 63438 | Durham | 63 | C | 0 | $95K |
| 8 | 63454 | Maywood | 63 | C | 0 | $186K |
| 9 | 63457 | Monticello | 63 | C | 0 | $180K |
| 10 | 63458 | Newark | 53 | D | 0 | $74K |
Recommended Buyer Guides for Lewis 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 — 68.6% 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
Deep Dive Reports
Detailed analysis for Lewis County, Missouri
Overview
Lewis County in Missouri covers 10 ZIP codes with an average Home Safety Score of B (70/100).
5 of 10 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.