Public water system · WI4430493
ActiveLena Waterworks
At a glance
Lena Waterworks (PWSID WI4430493) is an active community water system in Oconto County, Wisconsin. It reports serving 585 people through 216 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in October 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
585
Service connections
216
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Lena Waterworks compare with other water systems in Oconto County?
By EPA's size categories, Lena Waterworks is a small system (501 to 3,300 people). Oconto County has 202 active public water systems, and Lena Waterworks is the 4th-largest of them by population served. Its population served is about 5.8 times the county average of 101 people per system, and accounts for 2.9% of the 20,322 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 Lena 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 Lena Waterworks?
EPA lists Lena 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. 19 of the 202 active systems in Oconto County (9.4%) are also owned by a local government.
Does Lena Waterworks have drinking water violations?
EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in October 2024. The violations listed here began between May 1992 and October 2024. By type: 3 monitoring and reporting, 2 contaminant level above the legal limit, 1 public notice, recordkeeping or other and 1 required treatment not met. The contaminants or rules involved are Public Notice, Lead and Copper Rule Revisions, Total trihalomethanes (TTHM) and Haloacetic acids (HAA5). EPA lists 7 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 |
|---|---|---|---|---|
| 2024-10-17 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2024-10-17 | Required treatment not metLSL Inventory · code 2E | Lead and Copper Rule Revisionscode 5200 | Yes | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2012-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Radium (-226 and -228)code 4010 | Yes | Resolved |
| 2012-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1992-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 7 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.
Lena Waterworks: frequently asked questions
Who runs Lena Waterworks?
Lena Waterworks (PWSID WI4430493) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Lena Waterworks serve?
Lena Waterworks reports serving 585 people through 216 service connections in Oconto County, Wisconsin.
Where does Lena 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 Lena Waterworks have any drinking water violations?
EPA's records list 7 violations for this system; 3 are health-based, and the most recent began in October 2024. 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 Lena 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 7 violations for this system; 3 are health-based, and the most recent began in October 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Lena Waterworks' water quality report?
As a community water system, Lena 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 Oconto County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Oconto Waterworks | Oconto | 4,583 | Community | Groundwater |
| Oconto Falls Waterworks | Oconto | 2,892 | Community | Groundwater |
| Gillett Waterworks | Oconto | 1,264 | Community | Groundwater |
| Sunnyside Elementary Sch | Oconto | 575 | Non-transient non-community | Groundwater |
| Suring Waterworks | Oconto | 517 | Community | Groundwater |
| Abrams Elementary School | Oconto | 400 | Non-transient non-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, “Lena Waterworks, PWSID WI4430493, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/lena-waterworks-wi4430493 (data as of October 1, 2026).