Jefferson County, Kansas
8 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
Spanning 8 ZIP codes, Jefferson County posts strong drinking water compliance — most systems have never triggered a health-based notice.
How Jefferson County Compares
How Jefferson County Compares
Jefferson County scores 8 points above the Kansas state average (64/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Jefferson County, Kansas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.1 (asthma 10%, diabetes 11.2%)
Estimated additional annual cost per homeowner: $635, driven primarily by flood
Infrastructure: 0.372% avg pipe failure probability, 25% of ZIPs at high risk
63.8% of homes built before 1978 (lead paint era)
Violation History (2021–2022)
→ Stable trendEPA violation counts by year across Jefferson County water systems. Health-based shown in red, total in blue.
Peak year: 2021 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: $635
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
6,662 housing units in Jefferson 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 Jefferson County
Remediation costs are relatively manageable for most homeowners in Jefferson 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 Jefferson 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 Jefferson County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Jefferson Company Rwd 3 | 2,435 | 18 |
| 2 | Jefferson Company Rwd 1 | 2,343 | 18 |
| 3 | JEFFERSON CO RWD 7 | 1,180 | 13 |
| 4 | Jefferson Company Rwd 2 | 642 | 13 |
| 5 | City of Perry, | 858 | 13 |
22 total water systems serve Jefferson County.
All ZIP Codes in Jefferson County
8 ZIP codes tracked in Jefferson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 66066 | Oskaloosa | 81 | B | 1 | $215K |
| 2 | 66512 | Meriden | 81 | B | 1 | $183K |
| 3 | 66070 | Ozawkie | 79 | B | 5 | $208K |
| 4 | 66429 | Grantville | 76 | B | 5 (2 health) | $165K |
| 5 | 66073 | Perry | 73 | B | 7 | $189K |
| 6 | 66060 | Nortonville | 72 | B | 0 | $130K |
| 7 | 66054 | Mc Louth | 63 | C | 0 | $241K |
| 8 | 66016 | Cummings | 53 | D | 0 | $300K |
Recommended Buyer Guides for Jefferson 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 Lead Paint Test Kits — 63.8% of homes built before 1978
- 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 Jefferson County, Kansas
Overview
Jefferson County in Kansas covers 8 ZIP codes with an average Home Safety Score of B (72/100).
5 of 8 ZIP codes have recorded EPA violations. 2 health-based violations 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.