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Plymouth, WI Tap Water Quality 2026

Water quality report for Plymouth, WI — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Plymouth's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Plymouth Utilities PWSID: WI4600446 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 6.17 ppb, 41% of the action level and no violations are open. No PFAS was detected.

B

Plymouth earns a B for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 6.17 ppb — 41% of the federal action level
PFAS tested, none detected
22 violations since 2015, 0 health-based
No violations currently open
Plymouth's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 6.17 ppb — 41% of the federal action level
✓ Lower lead than 13% of Wisconsin utilities
Population Served
8902
~3139 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
22 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
41% of EPA action level
6.17 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
211.5% of EPA action level
2,750 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 6.17 ppb, 41% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Nitrate MONITORING AND REPORTING — 10 mg/L 2024 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2015 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2015 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2015 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2015 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2015 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2015 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2015 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2015 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2015 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2015 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2015 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2015 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2015 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

22 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Plymouth Utilities
PWSID WI4600446
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 8,902
Service connections 3,139
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Plymouth tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 6.17 ppb, 41% of the action level.
Does Plymouth water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Plymouth? ▼
Plymouth Utilities (PWSID WI4600446). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-10-09. No significant deficiencies were recorded.

What Should Plymouth Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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