Johnson County, Indiana
7 ZIP codes · Avg score 58/100 · Grade C · Updated 2026-06-03
Tracking 7 ZIP codes in Johnson County reveals a mixed picture — tap water quality varies meaningfully by location.
How Johnson County Compares
How Johnson County Compares
Johnson County scores 2 points below the Indiana state average (60/100) and 10 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Johnson County, Indiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.5 (asthma 10.9%, diabetes 12.2%)
Estimated additional annual cost per homeowner: $1,553, driven primarily by flood
Infrastructure: 0.314% avg pipe failure probability, 14% of ZIPs at high risk
46.7% 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: $1,553
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
62,252 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 | Indiana American Water - Johnson County | 86,813 | 34 |
| 2 | Bargersville Water Department | 34,418 | 32 |
| 3 | CITIZENS WATER - INDIANAPOLIS | 880,345 | 22 |
| 4 | Indiana American Water - Northwest | 210,510 | 22 |
| 5 | Indiana American Water - S. Indiana | 104,445 | 22 |
16 total water systems serve Johnson County.
All ZIP Codes in Johnson County
7 ZIP codes tracked in Johnson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 46184 | Whiteland | 68 | C | 2 | $205K |
| 2 | 46106 | Bargersville | 65 | C | 5 | $431K |
| 3 | 46124 | Edinburgh | 59 | C | 2 | $184K |
| 4 | 46131 | Franklin | 54 | D | 3 | $228K |
| 5 | 46142 | Greenwood | 54 | D | 11 (3 health) | $266K |
| 6 | 46143 | Greenwood | 54 | D | 11 (3 health) | $295K |
| 7 | 46162 | Needham | 53 | D | 0 | $717K |
Recommended Buyer Guides for Johnson County
Designed to find the guide that fits the county, not the other way around — the system reads EPA detections, FEMA hazard layers, and CDC lead-exposure markers, then outputs the categories that resolve those specific risks for households here, with NSF-certified products surfaced when the matching contaminant appears in the local monitoring data.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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
Deep Dive Reports
Detailed analysis for Johnson County, Indiana
Overview
Johnson County in Indiana covers 7 ZIP codes with an average Home Safety Score of C (58/100).
6 of 7 ZIP codes have recorded EPA violations. 6 health-based violations have been documented.
← Back to Indiana 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.