Public water system · WI4360436
ActiveTwo Rivers Waterworks
At a glance
Two Rivers Waterworks (PWSID WI4360436) is an active community water system in Manitowoc County, Wisconsin. It reports serving 11,270 people through 4,174 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
11,270
Service connections
4,174
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Two Rivers Waterworks compare with other water systems in Manitowoc County?
By EPA's size categories, Two Rivers Waterworks is a large system (10,001 to 100,000 people). Manitowoc County has 139 active public water systems, and Two Rivers Waterworks is the 2nd-largest of them by population served. Its population served is about 24 times the county average of 461 people per system, and accounts for 18% of the 64,022 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 Two Rivers Waterworks is about 68% above 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 20 Wisconsin systems (0.2%) list surface water as their primary source.
Who owns and regulates Two Rivers Waterworks?
EPA lists Two Rivers 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. 18 of the 139 active systems in Manitowoc County (13%) are also owned by a local government.
Does Two Rivers Waterworks have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2025. The violations listed here began between January 2017 and October 2025. By type: 10 monitoring and reporting, 1 required treatment not met and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (5 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 |
|---|---|---|---|---|
| 2025-10-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
| 2024-10-17 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2021-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2021-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2018-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-07-01 | Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-06-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-06-01 | Monitoring and reportingWater Quality Parameter M/R · code 53 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitritecode 1041 | No | Resolved |
| 2017-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloroethanecode 2980 | 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.
Two Rivers Waterworks: frequently asked questions
Who runs Two Rivers Waterworks?
Two Rivers Waterworks (PWSID WI4360436) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Two Rivers Waterworks serve?
Two Rivers Waterworks reports serving 11,270 people through 4,174 service connections in Manitowoc County, Wisconsin.
Where does Two Rivers Waterworks get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Two Rivers Waterworks have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2025. 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 Two Rivers 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. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Two Rivers Waterworks' water quality report?
As a community water system, Two Rivers 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 Manitowoc County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Manitowoc Waterworks | Manitowoc | 34,500 | Community | Surface water |
| Kiel Waterworks | Manitowoc | 3,932 | Community | Groundwater |
| Cleveland Waterworks | Manitowoc | 1,524 | Community | Groundwater |
| Mishicot Waterworks | Manitowoc | 1,432 | Community | Groundwater |
| Reedsville Waterworks | Manitowoc | 1,200 | Community | Groundwater |
| Valders Waterworks | Manitowoc | 954 | 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, “Two Rivers Waterworks, PWSID WI4360436, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/two-rivers-waterworks-wi4360436 (data as of October 1, 2026).