HALES CORNERS, WI · Waukesha County

OAKTON BEACH 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): WI2681086
System type: Community Water System
Population served: 144
Service connections: 9
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2023 – December 31, 2025
Archived
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2005 – October 28, 2005
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2001 – October 29, 2001
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2000 – November 16, 2000
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2000 – October 31, 2000
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2000 – September 30, 2000
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2000 – March 31, 2000
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
October 19, 1999 – August 17, 2000
Resolved
Monitoring, Regular
—
Radium-228
January 1, 1999 – December 31, 1999
Resolved
Monitoring, Regular
—
Radium-226
January 1, 1999 – December 31, 1999
Resolved
Monitoring, Regular
—
Nitrate
January 1, 1997 – December 31, 1997
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 1997 – December 31, 1997
Resolved
Monitoring, Regular
—
Arsenic
January 1, 1997 – December 31, 1997
Resolved
Monitoring, Regular
—
Cadmium
January 1, 1997 – December 31, 1997
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
September 1, 1994 – September 30, 1994
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
April 1, 1994 – April 30, 1994
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
April 1, 1994 – April 30, 1994
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
February 1, 1994 – February 28, 1994
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 1994 – January 31, 1994
Archived
Monitoring, Regular
—
Radium-226
January 1, 1994 – December 31, 1994
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
November 1, 1992 – November 30, 1992
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 1992 – January 31, 1992
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 1991 – September 30, 1991
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 1991 – August 31, 1991
Archived

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

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2023 – December 31, 2025	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Archived
October 1, 2005 – October 28, 2005	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2001 – October 29, 2001	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
November 1, 2000 – November 16, 2000	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2000 – October 31, 2000	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 2000 – September 30, 2000	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2000 – March 31, 2000	Monitoring, Regular	Nitrate	—	Resolved
October 19, 1999 – August 17, 2000	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 1999 – December 31, 1999	Monitoring, Regular	Radium-228	—	Resolved
January 1, 1999 – December 31, 1999	Monitoring, Regular	Radium-226	—	Resolved
January 1, 1997 – December 31, 1997	Monitoring, Regular	Nitrate	—	Resolved
January 1, 1997 – December 31, 1997	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 1997 – December 31, 1997	Monitoring, Regular	Arsenic	—	Resolved
January 1, 1997 – December 31, 1997	Monitoring, Regular	Cadmium	—	Resolved
September 1, 1994 – September 30, 1994	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
April 1, 1994 – April 30, 1994	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Archived
April 1, 1994 – April 30, 1994	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
February 1, 1994 – February 28, 1994	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
January 1, 1994 – January 31, 1994	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
January 1, 1994 – December 31, 1994	Monitoring, Regular	Radium-226	—	Resolved
November 1, 1992 – November 30, 1992	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 1992 – January 31, 1992	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
September 1, 1991 – September 30, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
August 1, 1991 – August 31, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived

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

Enforcement actions

January 9, 2005State Compliance achieved8 linked violations
October 29, 2001State Compliance achieved11 linked violations
November 13, 2000State Boil Water Order11 linked violations
August 17, 2000State Compliance achieved9 linked violations
August 15, 2000State Compliance achieved14 linked violations
August 15, 2000State Compliance achieved13 linked violations
July 20, 1999Federal issued Formal Notice of Violation5 linked violations
May 31, 1994State Compliance achieved1 linked violation
April 27, 1994State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
April 18, 1994State Formal Notice of Violation issued2 linked violations
April 18, 1994State Public Notification requested2 linked violations
March 24, 1994State Public Notification received1 linked violation
March 11, 1994State Public Notification received1 linked violation
March 9, 1994State Formal Notice of Violation issued9 linked violations
March 2, 1994State Public Notification requested1 linked violation
March 2, 1994State Violation/Reminder Notice1 linked violation
January 25, 1994State Public Notification received1 linked violation
October 28, 1993State Violation/Reminder Notice2 linked violations
October 28, 1993State Public Notification requested1 linked violation
September 30, 1993State Compliance achieved1 linked violation
February 18, 1993State Violation/Reminder Notice1 linked violation
February 18, 1993State Public Notification requested1 linked violation
December 30, 1992State Compliance achieved1 linked violation
December 2, 1991State Public Notification requested3 linked violations
August 29, 1991State Violation/Reminder Notice5 linked violations

Contact

WIMMER COMMUNITIES LLC - C/O JOHN J. WIMMER

Phone not on record

HALES CORNERS, WI 53130