States ›Wisconsin ›Dane County ›Middleton

Middleton, WI Tap Water Quality 2026

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

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

Main Utility: Middleton Waterworks PWSID: WI1130242 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 4.00 ppb, 27% of the action level and no violations are open. No PFAS was detected.

B

Middleton earns a B for water quality

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

Lead: 4.00 ppb — 27% of the federal action level
PFAS tested, none detected
30 violations since 2015, 1 health-based
No violations currently open
Middleton's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 4.00 ppb — 27% of the federal action level
✓ Lower lead than 25% of Wisconsin utilities
Population Served
20869
~8840 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
30 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
27% of EPA action level
4.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 4.00 ppb, 27% 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.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
Public Notice OTHER — — 2024 Unaddressed
Public Notice OTHER — — 2024 Unaddressed
Dalapon MONITORING AND REPORTING — 0.2 mg/L 2023 Resolved
Diquat MONITORING AND REPORTING — 0.02 mg/L 2023 Resolved
Endothall MONITORING AND REPORTING — 0.1 mg/L 2023 Resolved
Glyphosate MONITORING AND REPORTING — 0.7 mg/L 2023 Resolved
OXAMYL MONITORING AND REPORTING — 0.2 mg/L 2023 Resolved
Picloram MONITORING AND REPORTING — 0.5 mg/L 2023 Resolved
Dinoseb MONITORING AND REPORTING — 0.007 mg/L 2023 Resolved
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2023 Resolved
Aldicarb sulfoxide MONITORING AND REPORTING — — 2023 Resolved
Aldicarb sulfone MONITORING AND REPORTING — — 2023 Resolved
Carbofuran MONITORING AND REPORTING — 0.04 mg/L 2023 Resolved
Aldicarb MONITORING AND REPORTING — — 2023 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2023 Resolved
LASSO MONITORING AND REPORTING — — 2023 Resolved
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2023 Resolved
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2023 Resolved
2,4-D MONITORING AND REPORTING — 0.07 mg/L 2023 Resolved
2,4,5-TP MONITORING AND REPORTING — 0.05 mg/L 2023 Resolved
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2023 Resolved
Pentachlorophenol MONITORING AND REPORTING — 0.001 mg/L 2023 Resolved
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2023 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2023 Resolved
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2023 Resolved
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2023 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2023 Resolved
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2023 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

30 violations are on record since 2015, of which 1 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Middleton Waterworks
PWSID WI1130242
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 20,869
Service connections 8,840
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Middleton tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 4.00 ppb, 27% of the action level.
Does Middleton water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Middleton? ▼
Middleton Waterworks (PWSID WI1130242), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-02-06. Inspectors recorded 1 significant deficiency.

What Should Middleton Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
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.

Nearby Cities in Wisconsin

Madison, Wi Tap Water Quality 2026 Dane Sun Prairie, Wi Tap Water Quality 2026 Dane Fitchburg, Wi Tap Water Quality 2026 Dane Verona, Wi Tap Water Quality 2026 Dane Waunakee, Wi Tap Water Quality 2026 Dane Stoughton, Wi Tap Water Quality 2026 Dane