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Community Water System · PWS WI2680246

Norris Inc

Mukwonago, Wisconsin 53149 - drinking water served from groundwater sources to 141 people, tracked in EPA SDWIS and UCMR5.

141
People served
503
EPA violations
23
Health-based
Untested
UCMR5 result

The verdict

EPA records 503 drinking-water violations at Norris Inc, 5% of them health-based - above the Wisconsin per-system average.

503
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
141
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Norris Inc

Norris Inc is a private-owned community water system that delivers drinking water to 141 residents in Mukwonago, Wisconsin (Waukesha County) through 13 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 503 total violations for this system , of which 23 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 464 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 24 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%).

Norris Inc's 503 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
141
Total Violations
503
Health-Based Violations
23
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
13
County
Waukesha
School/Daycare
No
MCL Violations
19
Monitoring Violations
464
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 24 2011
Lead and Copper Rule MR 19 2025
Coliform (TCR) MCL 19 2006
1,2,4-Trichlorobenzene MR 17 2022
Xylenes, Total MR 17 2022
o-Dichlorobenzene MR 17 2022
1,1-Dichloroethylene MR 17 2022
trans-1,2-Dichloroethylene MR 17 2022
Styrene MR 17 2022
Toluene MR 17 2022
Benzene MR 17 2022
CHLOROBENZENE MR 17 2022
Tetrachloroethylene MR 17 2022
Trichloroethylene MR 17 2022
1,2-Dichloroethane MR 17 2022
Vinyl chloride MR 17 2022
1,1,1-Trichloroethane MR 17 2022
1,2-Dichloropropane MR 17 2022
1,1,2-Trichloroethane MR 17 2022
DICHLOROMETHANE MR 17 2022
Ethylbenzene MR 17 2022
Carbon tetrachloride MR 17 2022
p-Dichlorobenzene MR 17 2022
cis-1,2-Dichloroethylene MR 17 2022
Combined Uranium MR 12 2022
Combined Radium (-226 and -228) MR 12 2022
Radium-228 MR 12 2022
Gross Alpha, Excl. Radon and U MR 12 2022
Radium-226 MR 12 2022
Revised Total Coliform Rule MON 4 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 Norris Inc.

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 WI2680246 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 Norris Inc 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
2025 Lead and Copper Rule MR 19 SDWIS / WI2680246 / 5000
2025 Consumer Confidence Rule Other 2 SDWIS / WI2680246 / 7000
2022 1,2,4-Trichlorobenzene MR 17 SDWIS / WI2680246 / 2378
2022 Xylenes, Total MR 17 SDWIS / WI2680246 / 2955
2022 o-Dichlorobenzene MR 17 SDWIS / WI2680246 / 2968
2022 1,1-Dichloroethylene MR 17 SDWIS / WI2680246 / 2977
2022 trans-1,2-Dichloroethylene MR 17 SDWIS / WI2680246 / 2979
2022 Styrene MR 17 SDWIS / WI2680246 / 2996
2022 Toluene MR 17 SDWIS / WI2680246 / 2991
2022 Benzene MR 17 SDWIS / WI2680246 / 2990
2022 CHLOROBENZENE MR 17 SDWIS / WI2680246 / 2989
2022 Tetrachloroethylene MR 17 SDWIS / WI2680246 / 2987
2022 Trichloroethylene MR 17 SDWIS / WI2680246 / 2984
2022 1,2-Dichloroethane MR 17 SDWIS / WI2680246 / 2980
2022 Vinyl chloride MR 17 SDWIS / WI2680246 / 2976

How Norris Inc Compares

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

Metric Norris Inc Wisconsin avg Federal benchmark
Total violations 503 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 23 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 141 467 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 Norris Inc water safe to drink? ▼
Norris Inc (PWS ID: WI2680246) has 503 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 141 people using Groundwater sources.
How many people does Norris Inc serve? ▼
Norris Inc serves 141 people in Mukwonago, Wisconsin. It is a Private-owned system using Groundwater water sources with 13 service connections.
What type of violations does Norris Inc have? ▼
Norris Inc has 503 total violations: 23 health-based violations (MCL exceedances or treatment failures), 464 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Norris Inc water? ▼
No PFAS testing data is available for Norris Inc under the EPA's UCMR5 monitoring program.
What water source does Norris Inc use? ▼
Norris Inc 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.