St. Louis County, Kansas
1 ZIP code · Avg score 86/100 · Grade A · Updated 2026-06-04
St. Louis County's tap water quality puts it in the upper tier nationally; the 1 ZIP code here record few health-based violations.
How St. Louis County Compares
How St. Louis County Compares
St. Louis County scores 22 points above the Kansas state average (64/100) and 18 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 12.5 (asthma 10.6%, diabetes 11.5%)
Estimated additional annual cost per homeowner: $440, driven primarily by flood
Infrastructure: 0.41% avg pipe failure probability, 100% of ZIPs at high risk
63% 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: $440
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
1,208 housing units in St. Louis 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. Louis County
Remediation costs are relatively manageable for most homeowners in St. Louis 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. Louis 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. Louis County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Jefferson Company Rwd 3 | 2,435 | 4 |
| 2 | Jackson Company Rwd 3 | 4,376 | 4 |
| 3 | Atchison Company Rwd 5c | 3,690 | 4 |
| 4 | Jefferson Company Rwd 12 | 3,635 | 4 |
| 5 | Jefferson Company Rwd 1 | 2,343 | 4 |
7 total water systems serve St. Louis County.
All ZIP Codes in St. Louis County
1 ZIP code tracked in St. Louis County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 66088 | Valley Falls | 86 | A | 4 (1 health) | $187K |
Recommended Buyer Guides for St. Louis County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 63% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Overview
St. Louis County in Kansas covers 1 ZIP code with an average Home Safety Score of A (86/100).
1 of 1 ZIP code have recorded EPA violations. 1 health-based violation have been documented.
← Back to Kansas 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.