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FORT MCCOY SOUTH POST

PWS ID: WI6420307 · FORT MCCOY, Wisconsin 54656-5136

FORT MCCOY SOUTH POST serves 250 people in FORT MCCOY, Wisconsin using Groundwater water sources. It has 104 recorded EPA violations, including 6 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: FORT MCCOY SOUTH POST

FORT MCCOY SOUTH POST is a federal-owned community water system that delivers drinking water to 250 residents in FORT MCCOY, Wisconsin (Monroe County) through 119 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 104 total violations for this system , of which 6 (6%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 95 monitoring and reporting violations are on file. The most recent violation on record dates to 2022.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 6 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. FORT MCCOY SOUTH POST's 104 violations sit above the Wisconsin average. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%). 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
250
Total Violations
104
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Federal
Connections
119
County
Monroe
School/Daycare
No
MCL Violations
6
Monitoring Violations
95
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 6 2022
Coliform (TCR) MCL 6 1994
Coliform (TCR) MR 5 1995
p-Dichlorobenzene MR 4 2015
o-Dichlorobenzene MR 4 2015
1,2-Dichloroethane MR 4 2015
Trichloroethylene MR 4 2015
1,1,2-Trichloroethane MR 4 2015
CHLOROBENZENE MR 4 2015
Toluene MR 4 2015
Ethylbenzene MR 4 2015
Styrene MR 4 2015
Xylenes, Total MR 4 2015
cis-1,2-Dichloroethylene MR 4 2015
Vinyl chloride MR 4 2015
DICHLOROMETHANE MR 4 2015
1,1,1-Trichloroethane MR 4 2015
trans-1,2-Dichloroethylene MR 4 2015
Benzene MR 4 2015
1,2,4-Trichlorobenzene MR 4 2015
Tetrachloroethylene MR 4 2015
1,2-Dichloropropane MR 4 2015
Carbon tetrachloride MR 4 2015
1,1-Dichloroethylene MR 4 2015

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 FORT MCCOY SOUTH POST.

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 WI6420307 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 FORT MCCOY SOUTH POST 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
2022 Lead and Copper Rule MR 6 SDWIS / WI6420307 / 5000
2015 p-Dichlorobenzene MR 4 SDWIS / WI6420307 / 2969
2015 o-Dichlorobenzene MR 4 SDWIS / WI6420307 / 2968
2015 1,2-Dichloroethane MR 4 SDWIS / WI6420307 / 2980
2015 Trichloroethylene MR 4 SDWIS / WI6420307 / 2984
2015 1,1,2-Trichloroethane MR 4 SDWIS / WI6420307 / 2985
2015 CHLOROBENZENE MR 4 SDWIS / WI6420307 / 2989
2015 Toluene MR 4 SDWIS / WI6420307 / 2991
2015 Ethylbenzene MR 4 SDWIS / WI6420307 / 2992
2015 Styrene MR 4 SDWIS / WI6420307 / 2996
2015 Xylenes, Total MR 4 SDWIS / WI6420307 / 2955
2015 cis-1,2-Dichloroethylene MR 4 SDWIS / WI6420307 / 2380
2015 Vinyl chloride MR 4 SDWIS / WI6420307 / 2976
2015 DICHLOROMETHANE MR 4 SDWIS / WI6420307 / 2964
2015 1,1,1-Trichloroethane MR 4 SDWIS / WI6420307 / 2981

How FORT MCCOY SOUTH POST Compares

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

Metric FORT MCCOY SOUTH POST Wisconsin avg Federal benchmark
Total violations 104 26 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 6 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 250 467 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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is FORT MCCOY SOUTH POST water safe to drink? ▼
FORT MCCOY SOUTH POST (PWS ID: WI6420307) has 104 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 250 people using Groundwater sources.
How many people does FORT MCCOY SOUTH POST serve? ▼
FORT MCCOY SOUTH POST serves 250 people in FORT MCCOY, Wisconsin. It is a Federal-owned system using Groundwater water sources with 119 service connections.
What type of violations does FORT MCCOY SOUTH POST have? ▼
FORT MCCOY SOUTH POST has 104 total violations: 6 health-based violations (MCL exceedances or treatment failures), 95 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in FORT MCCOY SOUTH POST water? ▼
No PFAS testing data is available for FORT MCCOY SOUTH POST under the EPA's UCMR5 monitoring program.
What water source does FORT MCCOY SOUTH POST use? ▼
FORT MCCOY SOUTH POST uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
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.

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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.

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