Is DEERFIELD WATERWORKS required to publish a Consumer Confidence Report?

Yes. DEERFIELD WATERWORKS 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 DEERFIELD WATERWORKS’s next Consumer Confidence Report due?

DEERFIELD WATERWORKS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

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.

DEERFIELD, WI · Dane County

DEERFIELD WATERWORKS Water System

Consumer Confidence Report status

DEERFIELD WATERWORKS 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 DEERFIELD WATERWORKS.

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): WI1130223
System type: Community Water System
Population served: 2,510
Service connections: 929
Ownership: local government
Water source: groundwater (wells)

DEERFIELD WATERWORKS is one of 333 community water systems in Wisconsin in the 501 to 3,300 people size category, serving 2,510 people from groundwater.

As of August 1, 2026, its federal record holds 3 entries between 1991 and 1994, all of which EPA lists as closed. Nothing has been added since 1994.

Of the 3, 1 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 the Total Coliform Rules.

Violation history

Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
February 1, 1994 – February 28, 1994
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 1992 – November 30, 1992
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 1991 – September 30, 1991
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
February 1, 1994 – February 28, 1994	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
November 1, 1992 – November 30, 1992	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 1991 – September 30, 1991	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

October 24, 1994State Public Notification received1 linked violation
August 29, 1994State Compliance achieved1 linked violation
August 24, 1994State Public Notification requested1 linked violation
August 24, 1994State Violation/Reminder Notice1 linked violation
March 21, 1994State Public Notification requested1 linked violation
March 21, 1994State Violation/Reminder Notice1 linked violation
March 1, 1994State Compliance achieved1 linked violation
January 26, 1993State Public Notification requested1 linked violation
November 30, 1992State Compliance achieved1 linked violation
November 25, 1992State Public Notification requested1 linked violation
November 25, 1992State Violation/Reminder Notice1 linked violation
December 26, 1991State Compliance achieved1 linked violation
December 23, 1991State Public Notification requested1 linked violation
December 23, 1991State Violation/Reminder Notice1 linked violation
September 23, 1991State Public Notification requested1 linked violation

Common questions

Is DEERFIELD WATERWORKS required to publish a Consumer Confidence Report?: Yes. DEERFIELD WATERWORKS 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 DEERFIELD WATERWORKS’s next Consumer Confidence Report due?: DEERFIELD WATERWORKS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does DEERFIELD WATERWORKS have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for DEERFIELD WATERWORKS.
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

DOWNEY, RICHARD - DEERFIELD VIL ADMINISTRATOR

Phone not on record

DEERFIELD, WI 53531