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Community Water System · PWS WI6100337

Thorp Waterworks

Thorp, Wisconsin 54771 - drinking water served from groundwater sources to 1,636 people, tracked in EPA SDWIS and UCMR5.

1,636
People served
361
EPA violations
8
Health-based
Untested
UCMR5 result

The verdict

EPA records 361 drinking-water violations at Thorp Waterworks, 2% of them health-based - above the Wisconsin per-system average.

361
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
1,636
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Thorp Waterworks

Thorp Waterworks is a local-owned community water system that delivers drinking water to 1,636 residents in Thorp, Wisconsin (Clark County) through 774 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 361 total violations for this system , of which 8 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 344 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 Lead and Copper Rule, recorded in 36 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, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Thorp Waterworks's 361 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
1,636
Total Violations
361
Health-Based Violations
8
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
774
County
Clark
School/Daycare
No
MCL Violations
2
Monitoring Violations
344
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 36 2024
Coliform (TCR) MR 12 2016
DICHLOROMETHANE MR 12 1994
o-Dichlorobenzene MR 12 1994
p-Dichlorobenzene MR 12 1994
trans-1,2-Dichloroethylene MR 12 1994
1,1,1-Trichloroethane MR 12 1994
1,2-Dichloropropane MR 12 1994
1,2-Dichloroethane MR 12 1994
Tetrachloroethylene MR 12 1994
CHLOROBENZENE MR 12 1994
Benzene MR 12 1994
Ethylbenzene MR 12 1994
Vinyl chloride MR 12 1994
Toluene MR 12 1994
Xylenes, Total MR 12 1994
Styrene MR 12 1994
Trichloroethylene MR 12 1994
cis-1,2-Dichloroethylene MR 12 1994
1,2,4-Trichlorobenzene MR 12 1994
1,1-Dichloroethylene MR 12 1994
1,1,2-Trichloroethane MR 12 1994
Carbon tetrachloride MR 12 1994
Nitrate MR 8 2001
Chlorine MR 8 2016
Radium-226 MR 8 2020
Radium-228 MR 8 2020
Public Notice Other 6 2024
TTHM MR 4 2021
Lead and Copper Rule TT 4 2024

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 Thorp 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 WI6100337 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 Thorp 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 / WI6100337 / 5200
2024 Lead and Copper Rule MR 36 SDWIS / WI6100337 / 5000
2024 Public Notice Other 6 SDWIS / WI6100337 / 7500
2024 Lead and Copper Rule TT 4 SDWIS / WI6100337 / 5000
2022 Stage 1 Disinfectants and Disinfection Byproducts Rule TT 2 SDWIS / WI6100337 / 0400
2021 TTHM MR 4 SDWIS / WI6100337 / 2950
2021 Total Haloacetic Acids (HAA5) MR 4 SDWIS / WI6100337 / 2456
2020 Radium-226 MR 8 SDWIS / WI6100337 / 4020
2020 Radium-228 MR 8 SDWIS / WI6100337 / 4030
2016 Coliform (TCR) MR 12 SDWIS / WI6100337 / 3100
2016 Chlorine MR 8 SDWIS / WI6100337 / 0999
2006 Gross Alpha, Excl. Radon and U MCL 2 SDWIS / WI6100337 / 4000
2001 Nitrate MR 8 SDWIS / WI6100337 / 1040
2000 Consumer Confidence Rule Other 1 SDWIS / WI6100337 / 7000
1998 Gross Alpha, Excl. Radon and U MR 4 SDWIS / WI6100337 / 4000

How Thorp Waterworks Compares

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

Metric Thorp Waterworks Wisconsin avg Federal benchmark
Total violations 361 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 8 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 1,636 467 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 Thorp Waterworks water safe to drink? ▼
Thorp Waterworks (PWS ID: WI6100337) has 361 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,636 people using Groundwater sources.
How many people does Thorp Waterworks serve? ▼
Thorp Waterworks serves 1,636 people in Thorp, Wisconsin. It is a Local-owned system using Groundwater water sources with 774 service connections.
What type of violations does Thorp Waterworks have? ▼
Thorp Waterworks has 361 total violations: 8 health-based violations (MCL exceedances or treatment failures), 344 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Thorp Waterworks water? ▼
No PFAS testing data is available for Thorp Waterworks under the EPA's UCMR5 monitoring program.
What water source does Thorp Waterworks use? ▼
Thorp 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.