City of Onaga
EPA ID: KS2014905 · 671 people served · 1 ZIP code
For the full five-year period covered by EPA monitoring, City of Onaga has supplied tap water to 671 residents with no violations of any type on record.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for City of Onaga Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The City of Onaga serves a community with a median household income of $54,779 and an estimated 1,444 residents across its service area. Approximately 71% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
City of Onaga's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Pottawatomie County, Kansas rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Kansas
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
City of Onaga, (EPA ID: KS2014905) is a community water system in Kansas that serves approximately 671 people from groundwater sources.
This system serves ZIP code 66521 in Onaga.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 66521 — Onaga
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Onaga (KS2014905) on EPA.gov.
Frequently Asked Questions
Is City of Onaga water safe to drink?
Based on EPA records, City of Onaga has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does City of Onaga serve?
City of Onaga serves approximately 671 people across 1 ZIP code in Kansas.
Where does City of Onaga get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.