Johnson County, Missouri
8 ZIP codes · Avg score 78/100 · Grade B · Updated 2026-06-03
Within Johnson County, all 8 tracked ZIP codes show above-average drinking water safety — violations are infrequent and typically minor.
How Johnson County Compares
How Johnson County Compares
Johnson 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: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Johnson County, Missouri
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.1 (asthma 10.5%, diabetes 9.6%)
Estimated additional annual cost per homeowner: $396, driven primarily by flood
Infrastructure: 0.284% avg pipe failure probability
42.3% 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: $396
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
21,800 housing units in Johnson 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 Johnson County
Remediation costs are relatively manageable for most homeowners in Johnson 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 Johnson 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 Johnson County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Johnson County Pwsd 3 | 4,700 | 5 |
| 2 | Johnson County Pwsd 2 | 12,490 | 4 |
| 3 | Johnson County Pwsd 1 | 3,730 | 3 |
| 4 | Mo American Warrensburg | 18,500 | 2 |
| 5 | Pettis/johnson/saline Pwsd 1 | 1,000 | 2 |
19 total water systems serve Johnson County.
All ZIP Codes in Johnson County
8 ZIP codes tracked in Johnson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 64019 | Centerview | 83 | B | 0 | $219K |
| 2 | 64040 | Holden | 83 | B | 1 | $220K |
| 3 | 64061 | Kingsville | 83 | B | 0 | $240K |
| 4 | 64733 | Chilhowee | 83 | B | 0 | $197K |
| 5 | 64761 | Leeton | 82 | B | 2 | $124K |
| 6 | 64093 | Warrensburg | 78 | B | 1 | $228K |
| 7 | 65336 | Knob Noster | 78 | B | 1 | $195K |
| 8 | 65305 | Whiteman Air Force Base | 53 | D | 0 | — |
Recommended Buyer Guides for Johnson 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 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 Johnson County, Missouri
Overview
Johnson County in Missouri covers 8 ZIP codes with an average Home Safety Score of B (78/100).
4 of 8 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.