Public water system · WI4710357
ActiveOmro Waterworks
At a glance
Omro Waterworks (PWSID WI4710357) is an active community water system in Winnebago County, Wisconsin. It reports serving 3,629 people through 1,344 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in July 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
3,629
Service connections
1,344
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Omro Waterworks compare with other water systems in Winnebago County?
By EPA's size categories, Omro Waterworks is a medium system (3,301 to 10,000 people). Winnebago County has 145 active public water systems. Its population served is about 3.6 times the county average of 1,016 people per system, and accounts for 2.5% of the 147,267 people reported by systems filed under the county. Across Wisconsin, the 11,056 active systems average 469 people each. Nationally, the average active community water system reports serving 6,703 people, so Omro Waterworks is about half of 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. Wisconsin has 1,053 active community water systems, 9.5% of the state's 11,056 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,978 Wisconsin systems (99%) list groundwater as their primary source.
Who owns and regulates Omro Waterworks?
EPA lists Omro Waterworks as owned by a local government. The WI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 22 of the 145 active systems in Winnebago County (15%) are also owned by a local government.
Does Omro Waterworks have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in July 2023. The violations listed here began between June 1993 and July 2023. By type: 2 public notice, recordkeeping or other, 1 contaminant level above the legal limit and 1 monitoring and reporting. The contaminant or rule involved most often is Consumer Confidence Rule (2 of them). EPA lists 4 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 |
|---|---|---|---|---|
| 2023-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2023-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1994-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1993-06-30 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
All 4 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.
Omro Waterworks: frequently asked questions
Who runs Omro Waterworks?
Omro Waterworks (PWSID WI4710357) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Omro Waterworks serve?
Omro Waterworks reports serving 3,629 people through 1,344 service connections in Winnebago County, Wisconsin.
Where does Omro Waterworks 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 Omro Waterworks have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in July 2023. 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 Omro Waterworks' 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. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in July 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Omro Waterworks' water quality report?
As a community water system, Omro Waterworks 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 Winnebago County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Oshkosh Waterworks | Winnebago | 63,000 | Community | Surface water |
| Neenah Waterworks | Winnebago | 27,506 | Community | Surface water |
| Menasha Elec & Water Util | Winnebago | 15,144 | Community | Surface water |
| Fox Crossing Utilities West | Winnebago | 14,000 | Community | Groundwater |
| Fox Crossing Utilities East | Winnebago | 10,927 | Community | Purchased surface water |
| Algoma Tn Sanitary Dist 1 | Winnebago | 3,935 | 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, “Omro Waterworks, PWSID WI4710357, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/omro-waterworks-wi4710357 (data as of October 1, 2026).