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Community Water System · PWS WI4590454

Gresham Waterworks

Gresham, Wisconsin 54128 - drinking water served from groundwater sources to 534 people, tracked in EPA SDWIS and UCMR5.

534
People served
236
EPA violations
25
Health-based
Untested
UCMR5 result

The verdict

EPA records 236 drinking-water violations at Gresham Waterworks, 11% of them health-based - above the Wisconsin per-system average.

236
Total EPA violations on record
11%
Health-based (MCL / treatment failure)
534
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Gresham Waterworks

Gresham Waterworks is a local-owned community water system that delivers drinking water to 534 residents in Gresham, Wisconsin (Shawano County) through 285 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 236 total violations for this system , of which 25 (11%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 192 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 Gross Alpha, Excl. Radon and U, 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, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Gresham Waterworks's 236 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
534
Total Violations
236
Health-Based Violations
25
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
285
County
Shawano
School/Daycare
No
MCL Violations
23
Monitoring Violations
192
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Gross Alpha, Excl. Radon and U MR 28 2025
Radium-226 MR 20 2024
Radium-228 MR 20 2024
Coliform (TCR) MCL 13 2002
Revised Total Coliform Rule MON 12 2019
Consumer Confidence Rule Other 10 2022
Gross Alpha, Excl. Radon and U MCL 10 1998
Coliform (TCR) MR 9 1998
Total Haloacetic Acids (HAA5) MR 4 2014
Antimony, Total MR 4 2020
Atrazine MR 4 1993
cis-1,2-Dichloroethylene MR 4 1997
Xylenes, Total MR 4 1997
o-Dichlorobenzene MR 4 1997
1,1-Dichloroethylene MR 4 1997
1,2-Dichloropropane MR 4 1997
Tetrachloroethylene MR 4 1997
Styrene MR 4 1997
Vinyl chloride MR 4 1997
1,2-Dichloroethane MR 4 1997
p-Dichlorobenzene MR 4 1997
CHLOROBENZENE MR 4 1997
DICHLOROMETHANE MR 4 1997
Toluene MR 4 1997
TTHM MR 4 2014
1,2,4-Trichlorobenzene MR 4 1997
1,1,2-Trichloroethane MR 4 1997
1,1,1-Trichloroethane MR 4 1997
trans-1,2-Dichloroethylene MR 4 1997
Trichloroethylene MR 4 1997

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 Gresham 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 WI4590454 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 Gresham 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 Gross Alpha, Excl. Radon and U MR 28 SDWIS / WI4590454 / 4000
2025 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / WI4590454 / 5200
2024 Radium-226 MR 20 SDWIS / WI4590454 / 4020
2024 Radium-228 MR 20 SDWIS / WI4590454 / 4030
2024 Public Notice Other 3 SDWIS / WI4590454 / 7500
2024 LEAD AND COPPER RULE REVISIONS TT 2 SDWIS / WI4590454 / 5200
2022 Consumer Confidence Rule Other 10 SDWIS / WI4590454 / 7000
2020 Antimony, Total MR 4 SDWIS / WI4590454 / 1074
2019 Revised Total Coliform Rule MON 12 SDWIS / WI4590454 / 8000
2018 Lead and Copper Rule MR 3 SDWIS / WI4590454 / 5000
2014 Total Haloacetic Acids (HAA5) MR 4 SDWIS / WI4590454 / 2456
2014 TTHM MR 4 SDWIS / WI4590454 / 2950
2002 Coliform (TCR) MCL 13 SDWIS / WI4590454 / 3100
1998 Gross Alpha, Excl. Radon and U MCL 10 SDWIS / WI4590454 / 4000
1998 Coliform (TCR) MR 9 SDWIS / WI4590454 / 3100

How Gresham Waterworks Compares

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

Metric Gresham Waterworks Wisconsin avg Federal benchmark
Total violations 236 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 25 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 534 467 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 Gresham Waterworks water safe to drink? ▼
Gresham Waterworks (PWS ID: WI4590454) has 236 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 534 people using Groundwater sources.
How many people does Gresham Waterworks serve? ▼
Gresham Waterworks serves 534 people in Gresham, Wisconsin. It is a Local-owned system using Groundwater water sources with 285 service connections.
What type of violations does Gresham Waterworks have? ▼
Gresham Waterworks has 236 total violations: 25 health-based violations (MCL exceedances or treatment failures), 192 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Gresham Waterworks water? ▼
No PFAS testing data is available for Gresham Waterworks under the EPA's UCMR5 monitoring program.
What water source does Gresham Waterworks use? ▼
Gresham 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.