WI · Waukesha County
MUKWONAGO WATERWORKS Water System
Consumer Confidence Report status
MUKWONAGO 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 MUKWONAGO 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)
- WI2680209
- System type
- Community Water System
- Population served
- 8,190
- Service connections
- 3,033
- Ownership
- local government
- Water source
- groundwater (wells)
MUKWONAGO WATERWORKS is one of 102 community water systems in Wisconsin in the 3,301 to 10,000 people size category, serving 8,190 people from groundwater.
As of August 1, 2026, its federal record holds 11 entries between 1984 and 2015, all of which EPA lists as closed. Nothing has been added since 2015.
Of the 11, 9 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 Radionuclides and Revised Rad Rule, the Total Coliform Rules, and the Stage 1 Disinfectants and Disinfection Byproducts Rule.
Violation history
Monitoring, Routine Minor (TCR)
—Coliform (TCR)
October 1, 2015 – October 31, 2015
ResolvedMonitoring and Reporting (DBP)
—Chlorine
October 1, 2015 – November 13, 2015
ResolvedMonitoring, Regular
—Combined Radium (-226 and -228)
January 1, 2011 – December 31, 2011
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
January 1, 2011 – December 31, 2011
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2008 – July 11, 2008
ResolvedMonitoring and Reporting (DBP)
—TTHM
October 1, 2005 – December 31, 2005
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
November 1, 2004 – November 30, 2004
ArchivedMonitoring, Regular
—Nitrate
January 1, 2003 – December 31, 2003
ResolvedMonitoring, Regular
—Vinyl chloride
January 1, 2003 – December 31, 2003
ResolvedMonitoring, Regular
—Ethylbenzene
January 1, 2003 – December 31, 2003
ResolvedMaximum Contaminant Level Violation, Average
Health-basedCombined Radium (-226 and -228)
May 25, 1984 – May 24, 1988
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 |
|---|---|---|---|---|
| October 1, 2015 – October 31, 2015 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | Resolved |
| October 1, 2015 – November 13, 2015 | Monitoring and Reporting (DBP) | Chlorine | — | Resolved |
| January 1, 2011 – December 31, 2011 | Monitoring, Regular | Combined Radium (-226 and -228) | — | Resolved |
| January 1, 2011 – December 31, 2011 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Resolved |
| July 1, 2008 – July 11, 2008 | Consumer Confidence Report Complete Failure to Report | Consumer Confidence Rule | — | Resolved |
| October 1, 2005 – December 31, 2005 | Monitoring and Reporting (DBP) | TTHM | — | Resolved |
| November 1, 2004 – November 30, 2004 | Monitoring, Routine Minor (TCR) | Coliform (TCR) | — | Archived |
| January 1, 2003 – December 31, 2003 | Monitoring, Regular | Nitrate | — | Resolved |
| January 1, 2003 – December 31, 2003 | Monitoring, Regular | Vinyl chloride | — | Resolved |
| January 1, 2003 – December 31, 2003 | Monitoring, Regular | Ethylbenzene | — | Resolved |
| May 25, 1984 – May 24, 1988 | Maximum Contaminant Level Violation, Average | Combined Radium (-226 and -228) | 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
- June 28, 2016State Public Notification received6 linked violations
- November 30, 2015State Violation/Reminder Notice5 linked violations
- November 11, 2012State Other5 linked violations
- March 6, 2012State Compliance achieved16 linked violations
- March 5, 2012State Compliance achieved15 linked violations
- June 30, 2005State Public Notification issued15 linked violations
- June 30, 2005State Public Notification issued11 linked violations
- July 8, 2004State Public Notification issued16 linked violations
- December 3, 2001State Compliance achieved254 linked violations
- September 30, 1984State Formal Notice of Violation issued2 linked violations
Common questions
Is MUKWONAGO WATERWORKS required to publish a Consumer Confidence Report?
- Yes. MUKWONAGO 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 MUKWONAGO WATERWORKS’s next Consumer Confidence Report due?
- MUKWONAGO WATERWORKS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does MUKWONAGO WATERWORKS have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for MUKWONAGO 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
Not on record
Phone not on record