Public water system · NE3108904
ActiveOneill, City of
At a glance
City of Oneill (PWSID NE3108904) is an active community water system in Holt County, Nebraska. It reports serving 3,705 people through 1,716 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, 12 are health-based, and the most recent began in May 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,705
Service connections
1,716
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Oneill compare with other water systems in Holt County?
By EPA's size categories, City of Oneill is a medium system (3,301 to 10,000 people). Holt County has 16 active public water systems, and City of Oneill is the largest of them by population served. Its population served is about 8.4 times the county average of 443 people per system, and accounts for 52% of the 7,080 people reported by systems filed under the county. Across Nebraska, the 1,226 active systems average 1,472 people each. Nationally, the average active community water system reports serving 6,703 people, so City of Oneill is about 45% 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. Nebraska has 599 active community water systems, 49% of the state's 1,226 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,095 Nebraska systems (89%) list groundwater as their primary source.
Who owns and regulates City of Oneill?
EPA lists City of Oneill as owned by a local government. The NE state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 8 of the 16 active systems in Holt County (50%) are also owned by a local government.
Does City of Oneill have drinking water violations?
Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in May 2018. The violations listed here began between November 2004 and May 2018. By type: 12 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (9 of them). 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 |
|---|---|---|---|---|
| 2018-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2016-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2016-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2016-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2015-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2015-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2013-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2013-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2010-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2004-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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 Oneill: frequently asked questions
Who runs City of Oneill?
City of Oneill (PWSID NE3108904) is a community water system owned by a local government. It is regulated by the NE state drinking water program.
How many people does City of Oneill serve?
City of Oneill reports serving 3,705 people through 1,716 service connections in Holt County, Nebraska.
Where does City of Oneill 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 Oneill have any drinking water violations?
Of the 12 most recent violations in EPA's records, 12 are health-based, and the most recent began in May 2018. 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 Oneill'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, 12 are health-based, and the most recent began in May 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the NE state drinking water program.
Where can I find City of Oneill's water quality report?
As a community water system, City of Oneill 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 Holt County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Atkinson, City of | Holt | 1,298 | Community | Groundwater |
| Stuart, Village of | Holt | 486 | Community | Groundwater |
| Ewing, Village of | Holt | 367 | Community | Groundwater |
| Chambers, Village of | Holt | 288 | Community | Groundwater |
| Atkinson-Stuart Country Club | Holt | 200 | Transient non-community | Groundwater |
| Page, Village of | Holt | 166 | 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, “Oneill, City of, PWSID NE3108904, Nebraska”, https://aquacensus.com/water-systems/nebraska/oneill-city-of-ne3108904 (data as of October 1, 2026).