Public water system · WI6630257
ActiveHillsboro Waterworks
At a glance
Hillsboro Waterworks (PWSID WI6630257) is an active community water system in Vernon County, Wisconsin. It reports serving 1,325 people through 661 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, 7 are health-based, and the most recent began in July 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,325
Service connections
661
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hillsboro Waterworks compare with other water systems in Vernon County?
By EPA's size categories, Hillsboro Waterworks is a small system (501 to 3,300 people). Vernon County has 66 active public water systems, and Hillsboro Waterworks is the 3rd-largest of them by population served. Its population served is about 5.2 times the county average of 255 people per system, and accounts for 7.9% of the 16,796 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 Hillsboro 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 Hillsboro Waterworks?
EPA lists Hillsboro 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 66 active systems in Vernon County (29%) are also owned by a local government.
Does Hillsboro Waterworks have drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are health-based, and the most recent began in July 2023. The violations listed here began between June 2019 and July 2023. By type: 7 required treatment not met and 5 public notice, recordkeeping or other. The contaminant or rule involved most often is Groundwater Rule (4 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 |
|---|---|---|---|---|
| 2023-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2023-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2023-03-11 | Required treatment not metPublic Education · code 65 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2021-09-17 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2019-07-01 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2019-06-02 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2019-06-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2019-06-02 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2019-06-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2019-06-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2019-06-02 | Required treatment not metFailure To Address Deficiency · code 45 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2019-06-02 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | 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.
Hillsboro Waterworks: frequently asked questions
Who runs Hillsboro Waterworks?
Hillsboro Waterworks (PWSID WI6630257) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Hillsboro Waterworks serve?
Hillsboro Waterworks reports serving 1,325 people through 661 service connections in Vernon County, Wisconsin.
Where does Hillsboro 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 Hillsboro Waterworks have any drinking water violations?
Of the 12 most recent violations in EPA's records, 7 are 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 Hillsboro 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, 7 are 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 Hillsboro Waterworks' water quality report?
As a community water system, Hillsboro 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 Vernon County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Viroqua Waterworks | Vernon | 4,362 | Community | Groundwater |
| Westby Waterworks | Vernon | 2,400 | Community | Groundwater |
| Stoddard Waterworks | Vernon | 793 | Community | Groundwater |
| Coon Valley Waterworks | Vernon | 765 | Community | Groundwater |
| La Farge Waterworks | Vernon | 712 | Community | Groundwater |
| Viola Waterworks | Vernon | 667 | 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, “Hillsboro Waterworks, PWSID WI6630257, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/hillsboro-waterworks-wi6630257 (data as of October 1, 2026).