Public water system · WI6100330
ActiveNeillsville Waterworks
At a glance
Neillsville Waterworks (PWSID WI6100330) is an active community water system in Clark County, Wisconsin. It reports serving 2,384 people through 1,204 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; none is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,384
Service connections
1,204
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Neillsville Waterworks compare with other water systems in Clark County?
By EPA's size categories, Neillsville Waterworks is a small system (501 to 3,300 people). Clark County has 94 active public water systems, and Neillsville Waterworks is the largest of them by population served. Its population served is about 16 times the county average of 149 people per system, and accounts for 17% of the 14,002 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 Neillsville Waterworks is about 64% 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 Neillsville Waterworks?
EPA lists Neillsville 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. 32 of the 94 active systems in Clark County (34%) are also owned by a local government.
Does Neillsville Waterworks have drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in July 2025. The violations listed here began between July 2007 and July 2025. By type: 3 public notice, recordkeeping or other, 3 monitoring and reporting and 1 reporting. The contaminant or rule involved most often is Consumer Confidence Rule (3 of them). EPA lists 6 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
| 2022-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2022-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2021-02-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2007-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | 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.
Neillsville Waterworks: frequently asked questions
Who runs Neillsville Waterworks?
Neillsville Waterworks (PWSID WI6100330) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Neillsville Waterworks serve?
Neillsville Waterworks reports serving 2,384 people through 1,204 service connections in Clark County, Wisconsin.
Where does Neillsville 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 Neillsville Waterworks have any drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in July 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 Neillsville 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; none is health-based, and the most recent began in July 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 Neillsville Waterworks' water quality report?
As a community water system, Neillsville 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 Clark County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Thorp Waterworks | Clark | 1,636 | Community | Groundwater |
| Loyal Waterworks | Clark | 1,308 | Community | Groundwater |
| Greenwood Waterworks | Clark | 1,079 | Community | Groundwater |
| Owen Waterworks | Clark | 936 | Community | Groundwater |
| Dorchester Waterworks | Clark | 834 | Community | Groundwater |
| Clark County Rehabilitation & Living Center | Clark | 510 | 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, “Neillsville Waterworks, PWSID WI6100330, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/neillsville-waterworks-wi6100330 (data as of October 1, 2026).