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Community Water System · PWS WI6630262

Stoddard Waterworks

Stoddard, Wisconsin 54658 - drinking water served from groundwater sources to 793 people, tracked in EPA SDWIS and UCMR5.

793
People served
148
EPA violations
32
Health-based
Untested
UCMR5 result

The verdict

EPA records 148 drinking-water violations at Stoddard Waterworks, 22% of them health-based - above the Wisconsin per-system average.

148
Total EPA violations on record
22%
Health-based (MCL / treatment failure)
793
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Stoddard Waterworks

Stoddard Waterworks is a local-owned community water system that delivers drinking water to 793 residents in Stoddard, Wisconsin (Vernon County) through 325 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 148 total violations for this system , of which 32 (22%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 110 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 21 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%).

Stoddard Waterworks's 148 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
793
Total Violations
148
Health-Based Violations
32
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
325
County
Vernon
School/Daycare
No
MCL Violations
21
Monitoring Violations
110
Treatment Tech Violations
11

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 21 1997
Coliform (TCR) MR 11 2008
Groundwater Rule TT 10 2018
Lead and Copper Rule MR 4 2024
1,2,4-Trichlorobenzene MR 4 1993
cis-1,2-Dichloroethylene MR 4 1993
Xylenes, Total MR 4 1993
DICHLOROMETHANE MR 4 1993
o-Dichlorobenzene MR 4 1993
p-Dichlorobenzene MR 4 1993
Vinyl chloride MR 4 1993
1,1-Dichloroethylene MR 4 1993
trans-1,2-Dichloroethylene MR 4 1993
1,2-Dichloroethane MR 4 1993
1,1,1-Trichloroethane MR 4 1993
Trichloroethylene MR 4 1993
1,1,2-Trichloroethane MR 4 1993
Tetrachloroethylene MR 4 1993
CHLOROBENZENE MR 4 1993
Toluene MR 4 1993
Ethylbenzene MR 4 1993
Styrene MR 4 1993
Carbon tetrachloride MR 4 1993
Benzene MR 4 1993
1,2-Dichloropropane MR 4 1993
Nitrate MR 4 1993
Revised Total Coliform Rule MON 4 2018
Chlorine MR 3 2008
Public Notice Other 3 2024
Consumer Confidence Rule Other 1 2004

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 Stoddard 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 WI6630262 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 Stoddard 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
2024 Lead and Copper Rule MR 4 SDWIS / WI6630262 / 5000
2024 Public Notice Other 3 SDWIS / WI6630262 / 7500
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / WI6630262 / 5200
2018 Groundwater Rule TT 10 SDWIS / WI6630262 / 0700
2018 Revised Total Coliform Rule MON 4 SDWIS / WI6630262 / 8000
2008 Coliform (TCR) MR 11 SDWIS / WI6630262 / 3100
2008 Chlorine MR 3 SDWIS / WI6630262 / 0999
2004 Consumer Confidence Rule Other 1 SDWIS / WI6630262 / 7000
1997 Coliform (TCR) MCL 21 SDWIS / WI6630262 / 3100
1993 1,2,4-Trichlorobenzene MR 4 SDWIS / WI6630262 / 2378
1993 cis-1,2-Dichloroethylene MR 4 SDWIS / WI6630262 / 2380
1993 Xylenes, Total MR 4 SDWIS / WI6630262 / 2955
1993 DICHLOROMETHANE MR 4 SDWIS / WI6630262 / 2964
1993 o-Dichlorobenzene MR 4 SDWIS / WI6630262 / 2968
1993 p-Dichlorobenzene MR 4 SDWIS / WI6630262 / 2969

How Stoddard Waterworks Compares

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

Metric Stoddard Waterworks Wisconsin avg Federal benchmark
Total violations 148 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 32 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 793 467 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 Stoddard Waterworks water safe to drink? ▼
Stoddard Waterworks (PWS ID: WI6630262) has 148 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 793 people using Groundwater sources.
How many people does Stoddard Waterworks serve? ▼
Stoddard Waterworks serves 793 people in Stoddard, Wisconsin. It is a Local-owned system using Groundwater water sources with 325 service connections.
What type of violations does Stoddard Waterworks have? ▼
Stoddard Waterworks has 148 total violations: 32 health-based violations (MCL exceedances or treatment failures), 110 monitoring/reporting violations, and 11 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Stoddard Waterworks water? ▼
No PFAS testing data is available for Stoddard Waterworks under the EPA's UCMR5 monitoring program.
What water source does Stoddard Waterworks use? ▼
Stoddard 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.