Public water system · WI7720165
ActiveMarshfield Utilities
At a glance
Marshfield Utilities (PWSID WI7720165) is an active community water system in Wood County, Wisconsin. It reports serving 18,815 people through 7,999 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in November 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
18,815
Service connections
7,999
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Marshfield Utilities compare with other water systems in Wood County?
By EPA's size categories, Marshfield Utilities is a large system (10,001 to 100,000 people). Wood County has 148 active public water systems, and Marshfield Utilities is the 2nd-largest of them by population served. Its population served is about 48 times the county average of 396 people per system, and accounts for 32% of the 58,534 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 Marshfield Utilities is about 181% 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. 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 Marshfield Utilities?
EPA lists Marshfield Utilities 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. 42 of the 148 active systems in Wood County (28%) are also owned by a local government.
Does Marshfield Utilities have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in November 2020. The violations listed here began between July 2015 and November 2020. By type: 3 monitoring and reporting and 1 required treatment not met. The contaminants or rules involved are Lead and Copper Rule, Radium-228, Gross alpha (excluding radon and uranium) and Combined Radium (-226 and -228). EPA lists 4 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 |
|---|---|---|---|---|
| 2020-11-01 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2015-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Radium-228code 4030 | No | Resolved |
| 2015-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2015-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
All 4 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.
Marshfield Utilities: frequently asked questions
Who runs Marshfield Utilities?
Marshfield Utilities (PWSID WI7720165) is a community water system owned by a local government. It is regulated by the WI state drinking water program.
How many people does Marshfield Utilities serve?
Marshfield Utilities reports serving 18,815 people through 7,999 service connections in Wood County, Wisconsin.
Where does Marshfield Utilities 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 Marshfield Utilities have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in November 2020. 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 Marshfield Utilities' 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 4 violations for this system; 1 is health-based, and the most recent began in November 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the WI state drinking water program.
Where can I find Marshfield Utilities' water quality report?
As a community water system, Marshfield Utilities 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 Wood County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Wis Rapids Water Works & Lighting Comm | Wood | 20,000 | Community | Groundwater |
| Nekoosa Waterworks | Wood | 2,394 | Community | Groundwater |
| Port Edwards Water Utility | Wood | 1,866 | Community | Groundwater |
| Biron Water Utility | Wood | 879 | Community | Groundwater |
| Pittsville Waterworks | Wood | 800 | Community | Groundwater |
| Jammers | Wood | 725 | 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, “Marshfield Utilities, PWSID WI7720165, Wisconsin”, https://aquacensus.com/water-systems/wisconsin/marshfield-utilities-wi7720165 (data as of October 1, 2026).