Riley County, Kansas
8 ZIP codes · Avg score 61/100 · Grade C · Updated 2026-06-03
Water systems across Riley County's 8 ZIP codes produce average compliance results overall — pockets with documented violations exist, and the variation between areas makes ZIP-level lookup the most useful tool for residents here.
How Riley County Compares
How Riley County Compares
Riley 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: Riley County, Kansas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 9.5 (asthma 10.1%, diabetes 7.2%)
Estimated additional annual cost per homeowner: $1,158, driven primarily by flood
Infrastructure: 0.336% avg pipe failure probability, 13% of ZIPs at high risk
58.6% 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: $1,158
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
30,879 housing units in Riley 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 Riley County
Remediation costs are relatively manageable for most homeowners in Riley 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 Riley 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 Riley County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Riley Company Rwd 1 | 2,108 | 17 |
| 2 | City of Manhattan, | 54,763 | 8 |
| 3 | Colonial Gardens Mobile Home Ct | 1,200 | 8 |
| 4 | Riverchase Mobile Home Park | 460 | 8 |
| 5 | Konza Valley Water Benefit District | 345 | 8 |
13 total water systems serve Riley County.
All ZIP Codes in Riley County
8 ZIP codes tracked in Riley County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 66531 | Riley | 66 | C | 0 | $196K |
| 2 | 66449 | Leonardville | 65 | C | 3 | $159K |
| 3 | 66517 | Ogden | 65 | C | 0 | $150K |
| 4 | 66505 | Manhattan | 62 | C | 2 | — |
| 5 | 66506 | Manhattan | 62 | C | 2 | — |
| 6 | 66554 | Randolph | 60 | C | 6 | $241K |
| 7 | 66503 | Manhattan | 56 | C | 2 | $325K |
| 8 | 66502 | Manhattan | 51 | D | 2 | $218K |
Recommended Buyer Guides for Riley County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 58.6% of homes built before 1978
- 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 Riley County, Kansas
Overview
Riley County in Kansas covers 8 ZIP codes with an average Home Safety Score of C (61/100).
6 of 8 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.