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Community Water System · PWS WI1140151

Lomira Waterworks

Lomira, Wisconsin 53048 - drinking water served from groundwater sources to 2,701 people, tracked in EPA SDWIS and UCMR5.

2,701
People served
188
EPA violations
27
Health-based
Untested
UCMR5 result

The verdict

EPA records 188 drinking-water violations at Lomira Waterworks, 14% of them health-based - above the Wisconsin per-system average.

188
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
2,701
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lomira Waterworks

Lomira Waterworks is a local-owned community water system that delivers drinking water to 2,701 residents in Lomira, Wisconsin (Dodge County) through 1,000 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 188 total violations for this system , of which 27 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 149 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 Combined Radium (-226 and -228), recorded in 19 violations (MCL, health-based). 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%).

Lomira Waterworks's 188 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
2,701
Total Violations
188
Health-Based Violations
27
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,000
County
Dodge
School/Daycare
No
MCL Violations
27
Monitoring Violations
149
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 19 2007
Combined Radium (-226 and -228) MR 9 2014
Gross Alpha, Excl. Radon and U MR 8 2014
Radium-228 MR 8 2014
Revised Total Coliform Rule MON 8 2020
Gross Alpha, Excl. Radon and U MCL 6 1996
1,2,4-Trichlorobenzene MR 5 2003
cis-1,2-Dichloroethylene MR 5 2003
Xylenes, Total MR 5 2003
o-Dichlorobenzene MR 5 2003
1,1-Dichloroethylene MR 5 2003
trans-1,2-Dichloroethylene MR 5 2003
1,1,1-Trichloroethane MR 5 2003
Carbon tetrachloride MR 5 2003
1,2-Dichloropropane MR 5 2003
Trichloroethylene MR 5 2003
Benzene MR 5 2003
Toluene MR 5 2003
Styrene MR 5 2003
Nitrate MR 5 2003
p-Dichlorobenzene MR 5 2003
Vinyl chloride MR 5 2003
CHLOROBENZENE MR 5 2003
DICHLOROMETHANE MR 5 2003
Ethylbenzene MR 5 2003
Tetrachloroethylene MR 5 2003
1,2-Dichloroethane MR 5 2003
1,1,2-Trichloroethane MR 5 2003
Public Notice Other 4 2020
Coliform (TCR) MR 4 1993

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 Lomira Waterworks.

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 WI1140151 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 Lomira Waterworks 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 REVISIONS RPT 1 SDWIS / WI1140151 / 5200
2020 Revised Total Coliform Rule MON 8 SDWIS / WI1140151 / 8000
2020 Public Notice Other 4 SDWIS / WI1140151 / 7500
2020 Groundwater Rule Other 2 SDWIS / WI1140151 / 0700
2018 Lead and Copper Rule MR 2 SDWIS / WI1140151 / 5000
2014 Combined Radium (-226 and -228) MR 9 SDWIS / WI1140151 / 4010
2014 Gross Alpha, Excl. Radon and U MR 8 SDWIS / WI1140151 / 4000
2014 Radium-228 MR 8 SDWIS / WI1140151 / 4030
2007 Combined Radium (-226 and -228) MCL 19 SDWIS / WI1140151 / 4010
2003 1,2,4-Trichlorobenzene MR 5 SDWIS / WI1140151 / 2378
2003 cis-1,2-Dichloroethylene MR 5 SDWIS / WI1140151 / 2380
2003 Xylenes, Total MR 5 SDWIS / WI1140151 / 2955
2003 o-Dichlorobenzene MR 5 SDWIS / WI1140151 / 2968
2003 1,1-Dichloroethylene MR 5 SDWIS / WI1140151 / 2977
2003 trans-1,2-Dichloroethylene MR 5 SDWIS / WI1140151 / 2979

How Lomira Waterworks Compares

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

Metric Lomira Waterworks Wisconsin avg Federal benchmark
Total violations 188 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 27 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 2,701 467 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 Lomira Waterworks water safe to drink? ▼
Lomira Waterworks (PWS ID: WI1140151) has 188 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,701 people using Groundwater sources.
How many people does Lomira Waterworks serve? ▼
Lomira Waterworks serves 2,701 people in Lomira, Wisconsin. It is a Local-owned system using Groundwater water sources with 1,000 service connections.
What type of violations does Lomira Waterworks have? ▼
Lomira Waterworks has 188 total violations: 27 health-based violations (MCL exceedances or treatment failures), 149 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lomira Waterworks water? ▼
No PFAS testing data is available for Lomira Waterworks under the EPA's UCMR5 monitoring program.
What water source does Lomira Waterworks use? ▼
Lomira Waterworks 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.