Ontario, WI · Vernon County

ONTARIO WATERWORKS Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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): WI6630259
System type: Community Water System
Population served: 554
Service connections: 241
Ownership: local government
Water source: groundwater (wells)

Violation history

Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 2006 – June 21, 2006
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 1993 – August 31, 1993
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 1993 – May 31, 1993
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
June 1, 2006 – June 21, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
August 1, 1993 – August 31, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
May 1, 1993 – May 31, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

May 14, 2009State Public Notification requested68 linked violations
September 13, 1994State Public Notification received1 linked violation
September 2, 1994State Compliance achieved1 linked violation
August 29, 1994State Public Notification requested1 linked violation
August 29, 1994State Violation/Reminder Notice1 linked violation
January 6, 1994State Compliance achieved1 linked violation
December 22, 1993State Public Notification received1 linked violation
December 6, 1993State Site Visit for enforcement purposes1 linked violation
November 18, 1993State Technical Assistance Visit1 linked violation
October 26, 1993State Public Notification requested1 linked violation
October 26, 1993State Violation/Reminder Notice1 linked violation
October 20, 1993State Public Notification received1 linked violation
September 10, 1993State Public Notification received1 linked violation
September 10, 1993State Compliance achieved1 linked violation
September 3, 1993State Violation/Reminder Notice1 linked violation
September 3, 1993State Public Notification requested1 linked violation
July 19, 1993State Public Notification received1 linked violation
June 23, 1993State Public Notification received1 linked violation
June 4, 1993State Compliance achieved1 linked violation
May 27, 1993State Public Notification requested1 linked violation
May 27, 1993State Violation/Reminder Notice1 linked violation

Contact

ONTARIO VILLAGE CLERK/TERRI TAYLOR

Phone not on record

Ontario, WI 54651