Public water system · KS2014905
ActiveOnaga, City of
At a glance
City of Onaga (PWSID KS2014905) is an active community water system in Pottawatomie County, Kansas. It reports serving 671 people through 380 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2011.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
671
Service connections
380
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Onaga compare with other water systems in Pottawatomie County?
By EPA's size categories, City of Onaga is a small system (501 to 3,300 people). Pottawatomie County has 19 active public water systems. Its population served is about half of the county average of 1,221 people per system, and accounts for 2.9% of the 23,206 people reported by systems filed under the county. Across Kansas, the 1,041 active systems average 2,800 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Onaga is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Kansas has 863 active community water systems, 83% of the state's 1,041 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 587 Kansas systems (56%) list groundwater as their primary source.
Who owns and regulates City of Onaga?
EPA lists City of Onaga as owned by a local government. The KS state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 13 of the 19 active systems in Pottawatomie County (68%) are also owned by a local government.
Does City of Onaga have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2011. The violations listed here began between January 2002 and October 2011. By type: 11 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Lead and Copper Rule, Public Notice, Total coliform bacteria (TCR) and Cadmium. EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2011-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2011-05-01 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2010-04-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Berylliumcode 1075 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nickelcode 1036 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
The 12 most recent violations in EPA's records, newest first. Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
City of Onaga: frequently asked questions
Who runs City of Onaga?
City of Onaga (PWSID KS2014905) is a community water system owned by a local government. It is regulated by the KS state drinking water program.
How many people does City of Onaga serve?
City of Onaga reports serving 671 people through 380 service connections in Pottawatomie County, Kansas.
Where does City of Onaga get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does City of Onaga have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2011. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is City of Onaga's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2011. For current results, consult the system's annual water quality report, EPA ECHO, or the KS state drinking water program.
Where can I find City of Onaga's water quality report?
As a community water system, City of Onaga must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Pottawatomie County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Pottawatomie Co Rwd 1 | Pottawatomie | 7,535 | Community | Groundwater |
| Wamego, City of | Pottawatomie | 4,860 | Community | Groundwater |
| St Marys, City of | Pottawatomie | 2,781 | Community | Groundwater |
| Pottawatomie Co Rwd 3 | Pottawatomie | 1,455 | Community | Groundwater |
| Pottawatomie Co Rwd 4 | Pottawatomie | 1,125 | Community | Groundwater |
| St George, City of | Pottawatomie | 998 | Community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Onaga, City of, PWSID KS2014905, Kansas”, https://aquacensus.com/water-systems/kansas/onaga-city-of-ks2014905 (data as of October 1, 2026).