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Community Water System · PWS WI6320308

Green Oaks Mobile Home Court

Holmen, Wisconsin 54636 - drinking water served from groundwater sources to 117 people, tracked in EPA SDWIS and UCMR5.

117
People served
458
EPA violations
11
Health-based
Untested
UCMR5 result

The verdict

EPA records 458 drinking-water violations at Green Oaks Mobile Home Court, 2% of them health-based - above the Wisconsin per-system average.

458
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
117
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Green Oaks Mobile Home Court

Green Oaks Mobile Home Court is a private-owned community water system that delivers drinking water to 117 residents in Holmen, Wisconsin (La Crosse County) through 55 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 458 total violations for this system , of which 11 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 436 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Lead and Copper Rule, recorded in 31 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%).

Green Oaks Mobile Home Court's 458 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
117
Total Violations
458
Health-Based Violations
11
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
55
County
La Crosse
School/Daycare
No
MCL Violations
11
Monitoring Violations
436
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 31 1996
Coliform (TCR) MR 28 2008
Nitrate MR 13 1995
Chromium MR 12 1995
Mercury MR 12 1995
Fluoride MR 12 1995
1,1,1-Trichloroethane MR 12 1995
DICHLOROMETHANE MR 12 1995
Styrene MR 12 1995
Selenium MR 12 1995
1,2,4-Trichlorobenzene MR 12 1995
cis-1,2-Dichloroethylene MR 12 1995
Vinyl chloride MR 12 1995
trans-1,2-Dichloroethylene MR 12 1995
1,2-Dichloroethane MR 12 1995
1,1,2-Trichloroethane MR 12 1995
Tetrachloroethylene MR 12 1995
CHLOROBENZENE MR 12 1995
Toluene MR 12 1995
Nitrite MR 12 1995
o-Dichlorobenzene MR 12 1995
Carbon tetrachloride MR 12 1995
1,2-Dichloropropane MR 12 1995
Barium MR 12 1995
Cadmium MR 12 1995
Xylenes, Total MR 12 1995
Trichloroethylene MR 12 1995
Ethylbenzene MR 12 1995
Nitrate-Nitrite MR 12 1995
p-Dichlorobenzene MR 12 1995

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 Green Oaks Mobile Home Court.

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 WI6320308 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 Green Oaks Mobile Home Court 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
2020 Revised Total Coliform Rule MON 4 SDWIS / WI6320308 / 8000
2011 Coliform (TCR) MCL 11 SDWIS / WI6320308 / 3100
2008 Coliform (TCR) MR 28 SDWIS / WI6320308 / 3100
2000 Consumer Confidence Rule Other 1 SDWIS / WI6320308 / 7000
1996 Lead and Copper Rule MR 31 SDWIS / WI6320308 / 5000
1995 Nitrate MR 13 SDWIS / WI6320308 / 1040
1995 Chromium MR 12 SDWIS / WI6320308 / 1020
1995 Mercury MR 12 SDWIS / WI6320308 / 1035
1995 Fluoride MR 12 SDWIS / WI6320308 / 1025
1995 1,1,1-Trichloroethane MR 12 SDWIS / WI6320308 / 2981
1995 DICHLOROMETHANE MR 12 SDWIS / WI6320308 / 2964
1995 Styrene MR 12 SDWIS / WI6320308 / 2996
1995 Selenium MR 12 SDWIS / WI6320308 / 1045
1995 1,2,4-Trichlorobenzene MR 12 SDWIS / WI6320308 / 2378
1995 cis-1,2-Dichloroethylene MR 12 SDWIS / WI6320308 / 2380

How Green Oaks Mobile Home Court Compares

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

Metric Green Oaks Mobile Home Court Wisconsin avg Federal benchmark
Total violations 458 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 11 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 117 467 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 Green Oaks Mobile Home Court water safe to drink? ▼
Green Oaks Mobile Home Court (PWS ID: WI6320308) has 458 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 117 people using Groundwater sources.
How many people does Green Oaks Mobile Home Court serve? ▼
Green Oaks Mobile Home Court serves 117 people in Holmen, Wisconsin. It is a Private-owned system using Groundwater water sources with 55 service connections.
What type of violations does Green Oaks Mobile Home Court have? ▼
Green Oaks Mobile Home Court has 458 total violations: 11 health-based violations (MCL exceedances or treatment failures), 436 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Green Oaks Mobile Home Court water? ▼
No PFAS testing data is available for Green Oaks Mobile Home Court under the EPA's UCMR5 monitoring program.
What water source does Green Oaks Mobile Home Court use? ▼
Green Oaks Mobile Home Court 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.
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.