Transient Non-Community Water System · PWS WI2461466

Hahn Ace

Hartford, Wisconsin 53027 - drinking water served from groundwater sources to 190 people, tracked in EPA SDWIS and UCMR5.

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

190
People served: 158
EPA violations: 0
Health-based: Untested
UCMR5 result

The verdict

EPA records 158 drinking-water violations at Hahn Ace - above the Wisconsin per-system average.

158
Total EPA violations on record: 0%
Health-based (MCL / treatment failure): 190
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hahn Ace

Hahn Ace is a private-owned transient non-community water system that delivers drinking water to 190 residents in Hartford, Wisconsin (Ozaukee County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 158 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 158 monitoring and reporting violations are on file. The most recent violation on record dates to 2001.

The most frequently cited contaminant at this system is 1,2,4-Trichlorobenzene, 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. Statewide, 51 of 202 UCMR5-tested systems have reported PFAS detections (25.2%).

Hahn Ace's 158 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

190

Total Violations

158

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Transient Non-Community
Owner Type: Private
Connections: 1
County: Ozaukee
School/Daycare: No
MCL Violations: 0
Monitoring Violations: 158
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
1,2,4-Trichlorobenzene	MR	6	2001
Xylenes, Total	MR	6	2001
DICHLOROMETHANE	MR	6	2001
p-Dichlorobenzene	MR	6	2001
Vinyl chloride	MR	6	2001
trans-1,2-Dichloroethylene	MR	6	2001
1,2-Dichloroethane	MR	6	2001
Carbon tetrachloride	MR	6	2001
Tetrachloroethylene	MR	6	2001
CHLOROBENZENE	MR	6	2001
Benzene	MR	6	2001
Ethylbenzene	MR	6	2001
Styrene	MR	6	2001
cis-1,2-Dichloroethylene	MR	6	2001
1,1,2-Trichloroethane	MR	6	2001
Trichloroethylene	MR	6	2001
1,1,1-Trichloroethane	MR	6	2001
Toluene	MR	6	2001
o-Dichlorobenzene	MR	6	2001
1,1-Dichloroethylene	MR	6	2001
1,2-Dichloropropane	MR	6	2001
Coliform (TCR)	MR	2	1998
Lead and Copper Rule	MR	2	1998
Arsenic	MR	2	1998
Chromium	MR	2	1998
Mercury	MR	2	1998
Beryllium, Total	MR	2	1998
Nickel	MR	2	1998
Fluoride	MR	2	1998
Cadmium	MR	2	1998

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 Hahn Ace.

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 WI2461466 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 Hahn Ace 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
2001	1,2,4-Trichlorobenzene	MR	6	SDWIS / WI2461466 / 2378
2001	Xylenes, Total	MR	6	SDWIS / WI2461466 / 2955
2001	DICHLOROMETHANE	MR	6	SDWIS / WI2461466 / 2964
2001	p-Dichlorobenzene	MR	6	SDWIS / WI2461466 / 2969
2001	Vinyl chloride	MR	6	SDWIS / WI2461466 / 2976
2001	trans-1,2-Dichloroethylene	MR	6	SDWIS / WI2461466 / 2979
2001	1,2-Dichloroethane	MR	6	SDWIS / WI2461466 / 2980
2001	Carbon tetrachloride	MR	6	SDWIS / WI2461466 / 2982
2001	Tetrachloroethylene	MR	6	SDWIS / WI2461466 / 2987
2001	CHLOROBENZENE	MR	6	SDWIS / WI2461466 / 2989
2001	Benzene	MR	6	SDWIS / WI2461466 / 2990
2001	Ethylbenzene	MR	6	SDWIS / WI2461466 / 2992
2001	Styrene	MR	6	SDWIS / WI2461466 / 2996
2001	cis-1,2-Dichloroethylene	MR	6	SDWIS / WI2461466 / 2380
2001	1,1,2-Trichloroethane	MR	6	SDWIS / WI2461466 / 2985

How Hahn Ace Compares

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

Metric	Hahn Ace	Wisconsin avg	Federal benchmark
Total violations	158	26	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	0	5.3	Indicates a contaminant exceeded a federal MCL
PFAS detection	None	25.2%	EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served	190	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 Hahn Ace water safe to drink? ▼

Hahn Ace (PWS ID: WI2461466) has 158 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 190 people using Groundwater sources.

How many people does Hahn Ace serve? ▼

Hahn Ace serves 190 people in Hartford, Wisconsin. It is a Private-owned system using Groundwater water sources with 1 service connections.

What type of violations does Hahn Ace have? ▼

Hahn Ace has 158 total violations: 0 health-based violations (MCL exceedances or treatment failures), 158 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Hahn Ace water? ▼

No PFAS testing data is available for Hahn Ace under the EPA's UCMR5 monitoring program.

What water source does Hahn Ace use? ▼

Hahn Ace uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.

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.