PlainWater
States → Wisconsin

Community Water System · PWS WI4590455

Mattoon Waterworks

Mattoon, Wisconsin 54450 - drinking water served from groundwater sources to 450 people, tracked in EPA SDWIS and UCMR5.

450
People served
172
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 172 drinking-water violations at Mattoon Waterworks, 2% of them health-based - above the Wisconsin per-system average.

172
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
450
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mattoon Waterworks

Mattoon Waterworks is a local-owned community water system that delivers drinking water to 450 residents in Mattoon, Wisconsin (Shawano County) through 180 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 172 total violations for this system , of which 4 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 159 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 Chlorine, recorded in 17 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%).

Mattoon Waterworks's 172 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
450
Total Violations
172
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
180
County
Shawano
School/Daycare
No
MCL Violations
0
Monitoring Violations
159
Treatment Tech Violations
4

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Chlorine MR 17 2014
Coliform (TCR) MR 17 2014
Revised Total Coliform Rule MON 8 2022
1,2,4-Trichlorobenzene MR 5 2008
Xylenes, Total MR 5 2008
DICHLOROMETHANE MR 5 2008
o-Dichlorobenzene MR 5 2008
p-Dichlorobenzene MR 5 2008
Vinyl chloride MR 5 2008
1,1,1-Trichloroethane MR 5 2008
Trichloroethylene MR 5 2008
1,1,2-Trichloroethane MR 5 2008
Toluene MR 5 2008
Ethylbenzene MR 5 2008
cis-1,2-Dichloroethylene MR 5 2008
1,2-Dichloroethane MR 5 2008
trans-1,2-Dichloroethylene MR 5 2008
Carbon tetrachloride MR 5 2008
1,2-Dichloropropane MR 5 2008
Tetrachloroethylene MR 5 2008
Benzene MR 5 2008
CHLOROBENZENE MR 5 2008
Styrene MR 5 2008
1,1-Dichloroethylene MR 5 2008
Lead and Copper Rule MR 4 2012
Total Haloacetic Acids (HAA5) MR 4 2014
Public Notice Other 4 2023
TTHM MR 4 2014
Revised Total Coliform Rule RPT 4 2023
Revised Total Coliform Rule TT 4 2023

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 Mattoon 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 WI4590455 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 Mattoon 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 Public Notice Other 4 SDWIS / WI4590455 / 7500
2023 Revised Total Coliform Rule RPT 4 SDWIS / WI4590455 / 8000
2023 Revised Total Coliform Rule TT 4 SDWIS / WI4590455 / 8000
2022 Revised Total Coliform Rule MON 8 SDWIS / WI4590455 / 8000
2014 Chlorine MR 17 SDWIS / WI4590455 / 0999
2014 Coliform (TCR) MR 17 SDWIS / WI4590455 / 3100
2014 Total Haloacetic Acids (HAA5) MR 4 SDWIS / WI4590455 / 2456
2014 TTHM MR 4 SDWIS / WI4590455 / 2950
2012 Lead and Copper Rule MR 4 SDWIS / WI4590455 / 5000
2008 1,2,4-Trichlorobenzene MR 5 SDWIS / WI4590455 / 2378
2008 Xylenes, Total MR 5 SDWIS / WI4590455 / 2955
2008 DICHLOROMETHANE MR 5 SDWIS / WI4590455 / 2964
2008 o-Dichlorobenzene MR 5 SDWIS / WI4590455 / 2968
2008 p-Dichlorobenzene MR 5 SDWIS / WI4590455 / 2969
2008 Vinyl chloride MR 5 SDWIS / WI4590455 / 2976

How Mattoon Waterworks Compares

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

Metric Mattoon Waterworks Wisconsin avg Federal benchmark
Total violations 172 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 450 467 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 Mattoon Waterworks water safe to drink? ▼
Mattoon Waterworks (PWS ID: WI4590455) has 172 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 450 people using Groundwater sources.
How many people does Mattoon Waterworks serve? ▼
Mattoon Waterworks serves 450 people in Mattoon, Wisconsin. It is a Local-owned system using Groundwater water sources with 180 service connections.
What type of violations does Mattoon Waterworks have? ▼
Mattoon Waterworks has 172 total violations: 4 health-based violations (MCL exceedances or treatment failures), 159 monitoring/reporting violations, and 4 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mattoon Waterworks water? ▼
No PFAS testing data is available for Mattoon Waterworks under the EPA's UCMR5 monitoring program.
What water source does Mattoon Waterworks use? ▼
Mattoon 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.