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Community Water System · PWS WI6100339

Curtiss Waterworks

Curtiss, Wisconsin 54422 - drinking water served from groundwater sources to 346 people, tracked in EPA SDWIS and UCMR5.

346
People served
105
EPA violations
14
Health-based
Untested
UCMR5 result

The verdict

EPA records 105 drinking-water violations at Curtiss Waterworks, 13% of them health-based - above the Wisconsin per-system average.

105
Total EPA violations on record
13%
Health-based (MCL / treatment failure)
346
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Curtiss Waterworks

Curtiss Waterworks is a local-owned community water system that delivers drinking water to 346 residents in Curtiss, Wisconsin (Clark County) through 82 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 105 total violations for this system , of which 14 (13%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 81 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 28 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%).

Curtiss Waterworks's 105 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
346
Total Violations
105
Health-Based Violations
14
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
82
County
Clark
School/Daycare
No
MCL Violations
9
Monitoring Violations
81
Treatment Tech Violations
5

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 28 2007
Gross Alpha, Excl. Radon and U MR 9 2009
Coliform (TCR) MCL 9 2010
Chlorine MR 8 2007
Consumer Confidence Rule Other 6 2011
Groundwater Rule TT 5 2015
Combined Radium (-226 and -228) MR 4 2009
Revised Total Coliform Rule MON 4 2023
Radium-228 MR 4 2009
Lead and Copper Rule MR 2 2012
Public Notice Other 2 2009
Xylenes, Total MR 1 1993
o-Dichlorobenzene MR 1 1993
trans-1,2-Dichloroethylene MR 1 1993
1,1,1-Trichloroethane MR 1 1993
Trichloroethylene MR 1 1993
Benzene MR 1 1993
Styrene MR 1 1993
Nitrate MR 1 1993
p-Dichlorobenzene MR 1 1993
1,2-Dichloroethane MR 1 1993
cis-1,2-Dichloroethylene MR 1 1993
Carbon tetrachloride MR 1 1993
1,2-Dichloropropane MR 1 1993
Vinyl chloride MR 1 1993
CHLOROBENZENE MR 1 1993
Ethylbenzene MR 1 1993
1,2,4-Trichlorobenzene MR 1 1993
1,1,2-Trichloroethane MR 1 1993
1,1-Dichloroethylene MR 1 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 Curtiss 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 WI6100339 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 Curtiss 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 / WI6100339 / 8000
2015 Groundwater Rule TT 5 SDWIS / WI6100339 / 0700
2012 Lead and Copper Rule MR 2 SDWIS / WI6100339 / 5000
2011 Consumer Confidence Rule Other 6 SDWIS / WI6100339 / 7000
2010 Coliform (TCR) MCL 9 SDWIS / WI6100339 / 3100
2009 Gross Alpha, Excl. Radon and U MR 9 SDWIS / WI6100339 / 4000
2009 Combined Radium (-226 and -228) MR 4 SDWIS / WI6100339 / 4010
2009 Radium-228 MR 4 SDWIS / WI6100339 / 4030
2009 Public Notice Other 2 SDWIS / WI6100339 / 7500
2007 Coliform (TCR) MR 28 SDWIS / WI6100339 / 3100
2007 Chlorine MR 8 SDWIS / WI6100339 / 0999
1993 Xylenes, Total MR 1 SDWIS / WI6100339 / 2955
1993 o-Dichlorobenzene MR 1 SDWIS / WI6100339 / 2968
1993 trans-1,2-Dichloroethylene MR 1 SDWIS / WI6100339 / 2979
1993 1,1,1-Trichloroethane MR 1 SDWIS / WI6100339 / 2981

How Curtiss Waterworks Compares

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

Metric Curtiss Waterworks Wisconsin avg Federal benchmark
Total violations 105 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 14 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 346 467 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 Curtiss Waterworks water safe to drink? ▼
Curtiss Waterworks (PWS ID: WI6100339) has 105 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 346 people using Groundwater sources.
How many people does Curtiss Waterworks serve? ▼
Curtiss Waterworks serves 346 people in Curtiss, Wisconsin. It is a Local-owned system using Groundwater water sources with 82 service connections.
What type of violations does Curtiss Waterworks have? ▼
Curtiss Waterworks has 105 total violations: 14 health-based violations (MCL exceedances or treatment failures), 81 monitoring/reporting violations, and 5 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Curtiss Waterworks water? ▼
No PFAS testing data is available for Curtiss Waterworks under the EPA's UCMR5 monitoring program.
What water source does Curtiss Waterworks use? ▼
Curtiss 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.