WI · Dane County
MADISON WATER UTILITY Water System
Consumer Confidence Report status
MADISON WATER UTILITY must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for MADISON WATER UTILITY.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Wisconsin’s official records. Always confirm current status with Wisconsin before making decisions based on this information.
System facts
- System ID (PWSID)
- WI1130224
- System type
- Community Water System
- Population served
- 272,000
- Service connections
- 100,740
- Ownership
- local government
- Water source
- groundwater (wells)
MADISON WATER UTILITY is the second largest community water system in Wisconsin, serving 272,000 people from groundwater.
As of August 1, 2026, its federal record holds 5 entries between 1996 and 2001, all of which EPA lists as closed. Nothing has been added since 2001.
All 5 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves volatile organic chemicals.
Violation history
Monitoring, Regular
—Trichloroethylene
January 1, 2001 – March 31, 2001
ResolvedMonitoring, Regular
—Carbon tetrachloride
January 1, 2001 – March 31, 2001
ResolvedMonitoring, Regular
—Styrene
July 1, 1996 – September 30, 1996
ResolvedMonitoring, Regular
—Toluene
July 1, 1996 – September 30, 1996
ResolvedMonitoring, Regular
—o-Dichlorobenzene
July 1, 1996 – September 30, 1996
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| January 1, 2001 – March 31, 2001 | Monitoring, Regular | Trichloroethylene | — | Resolved |
| January 1, 2001 – March 31, 2001 | Monitoring, Regular | Carbon tetrachloride | — | Resolved |
| July 1, 1996 – September 30, 1996 | Monitoring, Regular | Styrene | — | Resolved |
| July 1, 1996 – September 30, 1996 | Monitoring, Regular | Toluene | — | Resolved |
| July 1, 1996 – September 30, 1996 | Monitoring, Regular | o-Dichlorobenzene | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
No enforcement actions on record for this system.
Common questions
Is MADISON WATER UTILITY required to publish a Consumer Confidence Report?
- Yes. MADISON WATER UTILITY is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is MADISON WATER UTILITY’s next Consumer Confidence Report due?
- MADISON WATER UTILITY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does MADISON WATER UTILITY have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for MADISON WATER UTILITY.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
Not on record
Phone not on record