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OMRO WATERWORKS

PWS ID: WI4710357 · OMRO, Wisconsin 54963

OMRO WATERWORKS serves 3,629 people in OMRO, Wisconsin using Groundwater water sources. It has 8 recorded EPA violations, including 3 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: OMRO WATERWORKS

OMRO WATERWORKS is a local-owned community water system that delivers drinking water to 3,629 residents in OMRO, Wisconsin (Winnebago County) through 1,344 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 8 total violations for this system , of which 3 (38%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 1 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 4 violations (Other). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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. OMRO WATERWORKS's 8 violations sit below 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
3,629
Total Violations
8
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,344
County
Winnebago
School/Daycare
No
MCL Violations
3
Monitoring Violations
1
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 4 2023
Coliform (TCR) MCL 3 1994
Lead and Copper Rule MR 1 1993

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 180 samples detected PFAS.

Contaminant Date Result MRL Status
HFPO-DA 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/21/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFTrDA 7/21/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 7/21/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFMBA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 7/21/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFNA 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 7/21/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
lithium 7/21/2025 <9 µg/L 9 µg/L Not Detected
PFDoA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 7/21/2025 <0.002 µg/L 0.002 µg/L Not Detected
8:2 FTS 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 7/21/2025 <0.02 µg/L 0.02 µg/L Not Detected
8:2 FTS 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFHxA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 7/21/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/21/2025 <0.002 µg/L 0.002 µg/L Not Detected
lithium 7/21/2025 <9 µg/L 9 µg/L Not Detected
PFDA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/21/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 7/21/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFTA 7/21/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 7/21/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 7/21/2025 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 7/21/2025 <0.006 µg/L 0.006 µg/L Not Detected

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 OMRO 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 WI4710357 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 OMRO 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
2023 Consumer Confidence Rule Other 4 SDWIS / WI4710357 / 7000
1994 Coliform (TCR) MCL 3 SDWIS / WI4710357 / 3100
1993 Lead and Copper Rule MR 1 SDWIS / WI4710357 / 5000

How OMRO WATERWORKS Compares

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

Metric OMRO WATERWORKS Wisconsin avg Federal benchmark
Total violations 8 26 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 3 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 3,629 467 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 OMRO WATERWORKS water safe to drink? ▼
OMRO WATERWORKS (PWS ID: WI4710357) has 8 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,629 people using Groundwater sources.
How many people does OMRO WATERWORKS serve? ▼
OMRO WATERWORKS serves 3,629 people in OMRO, Wisconsin. It is a Local-owned system using Groundwater water sources with 1,344 service connections.
What type of violations does OMRO WATERWORKS have? ▼
OMRO WATERWORKS has 8 total violations: 3 health-based violations (MCL exceedances or treatment failures), 1 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in OMRO WATERWORKS water? ▼
No. OMRO WATERWORKS was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does OMRO WATERWORKS use? ▼
OMRO 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.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial