Nemaha County, Nebraska
7 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-06-03
Compared to top-scoring counties, Nemaha County's 7 ZIP codes land in the middle tier — some meet standards cleanly, others carry documented violations, and the gap between the best and worst areas is wider than average.
How Nemaha County Compares
How Nemaha County Compares
Nemaha County scores 1 points above the Nebraska state average (65/100) and 2 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Nemaha County, Nebraska
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.5 (asthma 9.5%, diabetes 11.7%)
Estimated additional annual cost per homeowner: $1,233, driven primarily by energy_code_gap
Infrastructure: 0.444% avg pipe failure probability, 100% of ZIPs at high risk
83.1% 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: $1,233
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
3,282 housing units in Nemaha 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 Nemaha County
Water safety remediation is a moderate expense relative to home values. Most homeowners can address issues through staged improvements over time.
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 Nemaha 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 Nemaha County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Nemaha, Village of | 122 | 2 |
| 2 | Brownville, Village of | 142 | 2 |
| 3 | City of Auburn, | 3,478 | 1 |
| 4 | Nemaha Company Rwd #2 | 1,011 | 1 |
| 5 | Nemaha Company Rwd 1 | 600 | 1 |
9 total water systems serve Nemaha County.
All ZIP Codes in Nemaha County
7 ZIP codes tracked in Nemaha County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 68320 | Brock | 70 | B | 0 | $94K |
| 2 | 68378 | Johnson | 66 | C | 0 | $169K |
| 3 | 68379 | Julian | 66 | C | 0 | $55K |
| 4 | 68414 | Nemaha | 66 | C | 1 | $71K |
| 5 | 68305 | Auburn | 65 | C | 1 | $127K |
| 6 | 68321 | Brownville | 63 | C | 2 | $294K |
| 7 | 68421 | Peru | 63 | C | 1 | $98K |
Recommended Buyer Guides for Nemaha 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 — 83.1% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Nemaha County, Nebraska
Overview
Nemaha County in Nebraska covers 7 ZIP codes with an average Home Safety Score of C (66/100).
4 of 7 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.