Public water system · WI4380439
ActiveNiagara Waterworks
At a glance
Niagara Waterworks (PWSID WI4380439) is an active community water system in Marinette County, Wisconsin. It reports serving 1,561 people through 578 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in December 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,561
Service connections
578
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Niagara Waterworks compare with other water systems in Marinette County?
By EPA's size categories, Niagara Waterworks is a small system (501 to 3,300 people). Marinette County has 191 active public water systems, and Niagara Waterworks is the 3rd-largest of them by population served. Its population served is about 11 times the county average of 141 people per system, and accounts for 5.8% of the 26,830 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 Niagara Waterworks 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. 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 Niagara Waterworks?
EPA lists Niagara 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. 27 of the 191 active systems in Marinette County (14%) are also owned by a local government.
Does Niagara Waterworks have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in December 2019. The violations listed here began between July 2008 and December 2019. By type: 5 public notice, recordkeeping or other and 1 monitoring. The contaminant or rule involved most often is Consumer Confidence Rule (5 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2019-12-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2017-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2014-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2014-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2008-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
All 6 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.
Niagara Waterworks: frequently asked questions
Who runs Niagara Waterworks?
Niagara Waterworks (PWSID WI4380439) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Niagara Waterworks serve?
Niagara Waterworks reports serving 1,561 people through 578 service connections in Marinette County, Wisconsin.
Where does Niagara 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 Niagara Waterworks have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in December 2019. 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 Niagara 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 6 violations for this system; none is health-based, and the most recent began in December 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Niagara Waterworks' water quality report?
As a community water system, Niagara 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 Marinette County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Marinette Waterworks | Marinette | 10,968 | Community | Surface water |
| Peshtigo Waterworks | Marinette | 3,420 | Community | Groundwater |
| Crivitz Waterworks | Marinette | 1,026 | Community | Groundwater |
| Coleman Waterworks | Marinette | 727 | Community | Groundwater |
| Wausaukee Waterworks | Marinette | 585 | Community | Groundwater |
| Goodman Sanitary Dist No 1 | Marinette | 350 | 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, “Niagara Waterworks, PWSID WI4380439, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/niagara-waterworks-wi4380439 (data as of October 1, 2026).