Nemaha County, Kansas
8 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-06-03
Monitoring figures for Nemaha County indicate average water quality overall — some ZIP codes among the 8 tracked have recorded health-based violations, while others operate cleanly, making individual ZIP-level data the most actionable reference point.
How Nemaha County Compares
How Nemaha County Compares
Nemaha County scores 3 points below the Kansas state average (64/100) and 7 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Nemaha County, Kansas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.7 (asthma 9.9%, diabetes 11.4%)
Estimated additional annual cost per homeowner: $483, driven primarily by water_lead
Infrastructure: 0.42% avg pipe failure probability, 50% of ZIPs at high risk
73% 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: $483
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,282 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
Remediation costs are relatively manageable for most homeowners in Nemaha 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 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 | City of Oneida, | 58 | 12 |
| 2 | Nemaha Company Rwd 3 | 2,800 | 6 |
| 3 | Pottawatomie Company Rwd 3 | 1,455 | 6 |
| 4 | Nemaha Company Rwd 4 | 448 | 6 |
| 5 | City of Centralia, | 486 | 4 |
13 total water systems serve Nemaha County.
All ZIP Codes in Nemaha County
8 ZIP codes tracked in Nemaha County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 66538 | Seneca | 70 | B | 0 | $253K |
| 2 | 66408 | Bern | 66 | C | 0 | $151K |
| 3 | 66534 | Sabetha | 66 | C | 0 | $183K |
| 4 | 66550 | Wetmore | 66 | C | 0 | $137K |
| 5 | 66428 | Goff | 64 | C | 2 | — |
| 6 | 66417 | Corning | 55 | C | 0 | — |
| 7 | 66522 | Oneida | 53 | D | 12 (1 health) | $48K |
| 8 | 66415 | Centralia | 49 | D | 4 | $80K |
Recommended Buyer Guides for Nemaha County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Lead Paint Test Kits — 73% 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, Kansas
Overview
Nemaha County in Kansas covers 8 ZIP codes with an average Home Safety Score of C (61/100).
3 of 8 ZIP codes 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.