Johnson County, Nebraska
5 ZIP codes · Avg score 62/100 · Grade C · Updated 2026-06-03
Tracking 5 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 3 points below the Nebraska state average (65/100) and 6 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Johnson County, Nebraska
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13 (asthma 8.5%, diabetes 11.6%)
Estimated additional annual cost per homeowner: $1,010, driven primarily by energy_code_gap
Infrastructure: 0.46% avg pipe failure probability, 80% of ZIPs at high risk
80.2% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Johnson County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 1 violation. Past 5 years: 2 total (2 health-based).
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: $1,010
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
2,077 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 | City of Tecumseh, | 2,438 | 3 |
| 2 | Cook, Village of | 335 | 2 |
| 3 | Johnson Company Rwd 1 | 977 | 2 |
| 4 | Elk Creek, Village of | 82 | 1 |
| 5 | Crab Orchard, Village of | 37 | 0 |
6 total water systems serve Johnson County.
All ZIP Codes in Johnson County
5 ZIP codes tracked in Johnson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 68450 | Tecumseh | 69 | C | 2 | $118K |
| 2 | 68443 | Sterling | 66 | C | 0 | $182K |
| 3 | 68348 | Elk Creek | 65 | C | 1 (1 health) | — |
| 4 | 68329 | Cook | 56 | C | 2 (1 health) | $127K |
| 5 | 68332 | Crab Orchard | 54 | D | 0 | $258K |
Recommended Buyer Guides for Johnson County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 80.2% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Johnson County, Nebraska
Overview
Johnson County in Nebraska covers 5 ZIP codes with an average Home Safety Score of C (62/100).
3 of 5 ZIP codes have recorded EPA violations. 2 health-based violations have been documented.
← Back to Nebraska 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.