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Non-Transient Non-Community Water System · PWS WI7371905

Mullins Cheese Factory

Mosinee, Wisconsin 54455 - drinking water served from groundwater sources to 200 people, tracked in EPA SDWIS and UCMR5.

200
People served
123
EPA violations
5
Health-based
Untested
UCMR5 result

The verdict

EPA records 123 drinking-water violations at Mullins Cheese Factory, 4% of them health-based - above the Wisconsin per-system average.

123
Total EPA violations on record
4%
Health-based (MCL / treatment failure)
200
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mullins Cheese Factory

Mullins Cheese Factory is a private-owned non-transient non-community water system that delivers drinking water to 200 residents in Mosinee, Wisconsin (Marathon County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 123 total violations for this system , of which 5 (4%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 104 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 11 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Mullins Cheese Factory's 123 violations sit above the Wisconsin average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
200
Total Violations
123
Health-Based Violations
5
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
Marathon
School/Daycare
No
MCL Violations
5
Monitoring Violations
104
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 11 2005
Public Notice Other 8 2010
Lead and Copper Rule MR 6 2023
Coliform (TCR) MCL 5 2001
1,2,4-Trichlorobenzene MR 4 2010
cis-1,2-Dichloroethylene MR 4 2010
Xylenes, Total MR 4 2010
o-Dichlorobenzene MR 4 2010
p-Dichlorobenzene MR 4 2010
Vinyl chloride MR 4 2010
1,1-Dichloroethylene MR 4 2010
trans-1,2-Dichloroethylene MR 4 2010
1,2-Dichloroethane MR 4 2010
1,1,1-Trichloroethane MR 4 2010
Carbon tetrachloride MR 4 2010
Trichloroethylene MR 4 2010
1,1,2-Trichloroethane MR 4 2010
Tetrachloroethylene MR 4 2010
CHLOROBENZENE MR 4 2010
Ethylbenzene MR 4 2010
1,2-Dichloropropane MR 4 2010
Benzene MR 4 2010
DICHLOROMETHANE MR 4 2010
Styrene MR 4 2010
Toluene MR 4 2010
CYANIDE MR 3 2010
Groundwater Rule Other 2 2019

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Mullins Cheese Factory.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID WI7371905 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Wisconsin Drinking Water Authority

Wisconsin DNR, Drinking Water and Groundwater is the primacy agency that licenses and inspects Mullins Cheese Factory under EPA-delegated authority.

Open WI regulator portal

Source: Wisconsin DNR, Drinking Water and Groundwater

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2023 Lead and Copper Rule MR 6 SDWIS / WI7371905 / 5000
2019 Groundwater Rule Other 2 SDWIS / WI7371905 / 0700
2010 Public Notice Other 8 SDWIS / WI7371905 / 7500
2010 1,2,4-Trichlorobenzene MR 4 SDWIS / WI7371905 / 2378
2010 cis-1,2-Dichloroethylene MR 4 SDWIS / WI7371905 / 2380
2010 Xylenes, Total MR 4 SDWIS / WI7371905 / 2955
2010 o-Dichlorobenzene MR 4 SDWIS / WI7371905 / 2968
2010 p-Dichlorobenzene MR 4 SDWIS / WI7371905 / 2969
2010 Vinyl chloride MR 4 SDWIS / WI7371905 / 2976
2010 1,1-Dichloroethylene MR 4 SDWIS / WI7371905 / 2977
2010 trans-1,2-Dichloroethylene MR 4 SDWIS / WI7371905 / 2979
2010 1,2-Dichloroethane MR 4 SDWIS / WI7371905 / 2980
2010 1,1,1-Trichloroethane MR 4 SDWIS / WI7371905 / 2981
2010 Carbon tetrachloride MR 4 SDWIS / WI7371905 / 2982
2010 Trichloroethylene MR 4 SDWIS / WI7371905 / 2984

How Mullins Cheese Factory Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Mullins Cheese Factory Wisconsin avg Federal benchmark
Total violations 123 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 5 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 38.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 200 467 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,988 regulated public water systems in Wisconsin.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Mullins Cheese Factory water safe to drink? ▼
Mullins Cheese Factory (PWS ID: WI7371905) has 123 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 200 people using Groundwater sources.
How many people does Mullins Cheese Factory serve? ▼
Mullins Cheese Factory serves 200 people in Mosinee, Wisconsin. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does Mullins Cheese Factory have? ▼
Mullins Cheese Factory has 123 total violations: 5 health-based violations (MCL exceedances or treatment failures), 104 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mullins Cheese Factory water? ▼
No PFAS testing data is available for Mullins Cheese Factory under the EPA's UCMR5 monitoring program.
What water source does Mullins Cheese Factory use? ▼
Mullins Cheese Factory uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.