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Community Water System · PWS WI1250086

Rewey Waterworks

Rewey, Wisconsin 53580 - drinking water served from groundwater sources to 290 people, tracked in EPA SDWIS and UCMR5.

290
People served
161
EPA violations
36
Health-based
Untested
UCMR5 result

The verdict

EPA records 161 drinking-water violations at Rewey Waterworks, 22% of them health-based - above the Wisconsin per-system average.

161
Total EPA violations on record
22%
Health-based (MCL / treatment failure)
290
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Rewey Waterworks

Rewey Waterworks is a local-owned community water system that delivers drinking water to 290 residents in Rewey, Wisconsin (Iowa County) through 107 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 161 total violations for this system , of which 36 (22%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 114 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 Coliform (TCR), recorded in 33 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%).

Rewey Waterworks's 161 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
290
Total Violations
161
Health-Based Violations
36
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
107
County
Iowa
School/Daycare
No
MCL Violations
33
Monitoring Violations
114
Treatment Tech Violations
3

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 33 2010
Lead and Copper Rule MR 11 2012
Coliform (TCR) MR 11 2003
Consumer Confidence Rule Other 6 2019
Public Notice Other 4 2009
1,2,4-Trichlorobenzene MR 4 2018
Benzene MR 4 2018
CHLOROBENZENE MR 4 2018
1,2-Dichloroethane MR 4 2018
1,1-Dichloroethylene MR 4 2018
Vinyl chloride MR 4 2018
p-Dichlorobenzene MR 4 2018
cis-1,2-Dichloroethylene MR 4 2018
Revised Total Coliform Rule MON 4 2023
Nitrate MR 4 1994
Tetrachloroethylene MR 4 2018
1,1,2-Trichloroethane MR 4 2018
DICHLOROMETHANE MR 4 2018
1,2-Dichloropropane MR 4 2018
1,1,1-Trichloroethane MR 4 2018
Carbon tetrachloride MR 4 2018
Toluene MR 4 2018
o-Dichlorobenzene MR 4 2018
Ethylbenzene MR 4 2018
Styrene MR 4 2018
Trichloroethylene MR 4 2018
Xylenes, Total MR 4 2018
trans-1,2-Dichloroethylene MR 4 2018
Stage 1 Disinfectants and Disinfection Byproducts Rule TT 2 2020
Lead and Copper Rule TT 1 2009

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 Rewey 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 WI1250086 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 Rewey 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 Revised Total Coliform Rule MON 4 SDWIS / WI1250086 / 8000
2020 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 2 SDWIS / WI1250086 / 0400
2019 Consumer Confidence Rule Other 6 SDWIS / WI1250086 / 7000
2018 1,2,4-Trichlorobenzene MR 4 SDWIS / WI1250086 / 2378
2018 Benzene MR 4 SDWIS / WI1250086 / 2990
2018 CHLOROBENZENE MR 4 SDWIS / WI1250086 / 2989
2018 1,2-Dichloroethane MR 4 SDWIS / WI1250086 / 2980
2018 1,1-Dichloroethylene MR 4 SDWIS / WI1250086 / 2977
2018 Vinyl chloride MR 4 SDWIS / WI1250086 / 2976
2018 p-Dichlorobenzene MR 4 SDWIS / WI1250086 / 2969
2018 cis-1,2-Dichloroethylene MR 4 SDWIS / WI1250086 / 2380
2018 Tetrachloroethylene MR 4 SDWIS / WI1250086 / 2987
2018 1,1,2-Trichloroethane MR 4 SDWIS / WI1250086 / 2985
2018 DICHLOROMETHANE MR 4 SDWIS / WI1250086 / 2964
2018 1,2-Dichloropropane MR 4 SDWIS / WI1250086 / 2983

How Rewey Waterworks Compares

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

Metric Rewey Waterworks Wisconsin avg Federal benchmark
Total violations 161 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 36 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 290 467 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 Rewey Waterworks water safe to drink? ▼
Rewey Waterworks (PWS ID: WI1250086) has 161 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 290 people using Groundwater sources.
How many people does Rewey Waterworks serve? ▼
Rewey Waterworks serves 290 people in Rewey, Wisconsin. It is a Local-owned system using Groundwater water sources with 107 service connections.
What type of violations does Rewey Waterworks have? ▼
Rewey Waterworks has 161 total violations: 36 health-based violations (MCL exceedances or treatment failures), 114 monitoring/reporting violations, and 3 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Rewey Waterworks water? ▼
No PFAS testing data is available for Rewey Waterworks under the EPA's UCMR5 monitoring program.
What water source does Rewey Waterworks use? ▼
Rewey 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.