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Community Water System · PWS WI1110125

Randolph Water Dept

Randolph, Wisconsin 53956 - drinking water served from groundwater sources to 1,800 people, tracked in EPA SDWIS and UCMR5.

1,800
People served
202
EPA violations
33
Health-based
Untested
UCMR5 result

The verdict

EPA records 202 drinking-water violations at Randolph Water Dept, 16% of them health-based - above the Wisconsin per-system average.

202
Total EPA violations on record
16%
Health-based (MCL / treatment failure)
1,800
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Randolph Water Dept

Randolph Water Dept is a local-owned community water system that delivers drinking water to 1,800 residents in Randolph, Wisconsin (Columbia County) through 666 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 202 total violations for this system , of which 33 (16%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 162 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 Combined Radium (-226 and -228), recorded in 25 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%).

Randolph Water Dept's 202 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
1,800
Total Violations
202
Health-Based Violations
33
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
666
County
Columbia
School/Daycare
No
MCL Violations
33
Monitoring Violations
162
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 25 2025
Revised Total Coliform Rule MON 12 2023
Styrene MR 8 2003
Coliform (TCR) MR 7 2000
1,1,2-Trichloroethane MR 6 1995
1,1,1-Trichloroethane MR 6 1995
1,2-Dichloropropane MR 6 1995
Nitrate MR 6 1995
Tetrachloroethylene MR 6 1995
Toluene MR 6 1995
cis-1,2-Dichloroethylene MR 6 1995
1,1-Dichloroethylene MR 6 1995
o-Dichlorobenzene MR 6 1995
CHLOROBENZENE MR 6 1995
Trichloroethylene MR 6 1995
Carbon tetrachloride MR 6 1995
1,2-Dichloroethane MR 6 1995
trans-1,2-Dichloroethylene MR 6 1995
Xylenes, Total MR 6 1995
p-Dichlorobenzene MR 6 1995
1,2,4-Trichlorobenzene MR 6 1995
Ethylbenzene MR 6 1995
DICHLOROMETHANE MR 6 1995
Vinyl chloride MR 6 1995
Lead and Copper Rule MR 6 2024
Benzene MR 6 1995
Coliform (TCR) MCL 4 1999
Arsenic MCL 4 2012
Public Notice Other 3 2012
Gross Alpha, Excl. Radon and U MR 3 1995

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 Randolph Water Dept.

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 WI1110125 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 Randolph Water Dept 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 Combined Radium (-226 and -228) MCL 25 SDWIS / WI1110125 / 4010
2024 Lead and Copper Rule MR 6 SDWIS / WI1110125 / 5000
2023 Revised Total Coliform Rule MON 12 SDWIS / WI1110125 / 8000
2012 Arsenic MCL 4 SDWIS / WI1110125 / 1005
2012 Public Notice Other 3 SDWIS / WI1110125 / 7500
2003 Styrene MR 8 SDWIS / WI1110125 / 2996
2000 Coliform (TCR) MR 7 SDWIS / WI1110125 / 3100
1999 Coliform (TCR) MCL 4 SDWIS / WI1110125 / 3100
1995 1,1,2-Trichloroethane MR 6 SDWIS / WI1110125 / 2985
1995 1,1,1-Trichloroethane MR 6 SDWIS / WI1110125 / 2981
1995 1,2-Dichloropropane MR 6 SDWIS / WI1110125 / 2983
1995 Nitrate MR 6 SDWIS / WI1110125 / 1040
1995 Tetrachloroethylene MR 6 SDWIS / WI1110125 / 2987
1995 Toluene MR 6 SDWIS / WI1110125 / 2991
1995 cis-1,2-Dichloroethylene MR 6 SDWIS / WI1110125 / 2380

How Randolph Water Dept Compares

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

Metric Randolph Water Dept Wisconsin avg Federal benchmark
Total violations 202 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 33 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 1,800 467 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 Randolph Water Dept water safe to drink? ▼
Randolph Water Dept (PWS ID: WI1110125) has 202 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,800 people using Groundwater sources.
How many people does Randolph Water Dept serve? ▼
Randolph Water Dept serves 1,800 people in Randolph, Wisconsin. It is a Local-owned system using Groundwater water sources with 666 service connections.
What type of violations does Randolph Water Dept have? ▼
Randolph Water Dept has 202 total violations: 33 health-based violations (MCL exceedances or treatment failures), 162 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Randolph Water Dept water? ▼
No PFAS testing data is available for Randolph Water Dept under the EPA's UCMR5 monitoring program.
What water source does Randolph Water Dept use? ▼
Randolph Water Dept 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.