Public water system · WI6100328
ActiveGreenwood Waterworks
At a glance
Greenwood Waterworks (PWSID WI6100328) is an active community water system in Clark County, Wisconsin. It reports serving 1,079 people through 437 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in July 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,079
Service connections
437
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Greenwood Waterworks compare with other water systems in Clark County?
By EPA's size categories, Greenwood Waterworks is a small system (501 to 3,300 people). Clark County has 94 active public water systems, and Greenwood Waterworks is the 4th-largest of them by population served. Its population served is about 7.2 times the county average of 149 people per system, and accounts for 7.7% 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 Greenwood 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 Greenwood Waterworks?
EPA lists Greenwood 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 Greenwood Waterworks have drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in July 2010. The violations listed here began between September 1994 and July 2010. By type: 5 public notice, recordkeeping or other, 2 monitoring and reporting and 2 contaminant level above the legal limit. The contaminant or rule involved most often is Consumer Confidence Rule (5 of them). EPA lists 9 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 |
|---|---|---|---|---|
| 2010-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2004-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2003-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2002-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2001-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2000-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1999-09-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1994-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1994-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 9 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.
Greenwood Waterworks: frequently asked questions
Who runs Greenwood Waterworks?
Greenwood Waterworks (PWSID WI6100328) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Greenwood Waterworks serve?
Greenwood Waterworks reports serving 1,079 people through 437 service connections in Clark County, Wisconsin.
Where does Greenwood 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 Greenwood Waterworks have any drinking water violations?
EPA's records list 9 violations for this system; 2 are health-based, and the most recent began in July 2010. 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 Greenwood 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 9 violations for this system; 2 are health-based, and the most recent began in July 2010. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Greenwood Waterworks' water quality report?
As a community water system, Greenwood 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 |
|---|---|---|---|---|
| Neillsville Waterworks | Clark | 2,384 | Community | Groundwater |
| Thorp Waterworks | Clark | 1,636 | Community | Groundwater |
| Loyal Waterworks | Clark | 1,308 | 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, “Greenwood Waterworks, PWSID WI6100328, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/greenwood-waterworks-wi6100328 (data as of October 1, 2026).