Public water system record
Lake Mills Waterworks
Serves Lake Mills, Jefferson County, WI · 6,211 people served
Federal records show 4 health-based violations and 21 monitoring/reporting issues for Lake Mills Waterworks in the last ten years. The most serious issue in this window was a resolved Lead and Copper Rule violation.
System profile
- Health-based violations, last 10 years
- 4
- Resolved
- 4
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 21
Key facts
- Lake Mills Waterworks draws water from 3 wells.
- Highest measured level in the last 10 years: Combined Radium (-226 and -228), 5.5 pCi/L, federal limit 5 pCi/L (1.1 times the limit), 2017.
- Most recent formal enforcement: compliance order (no penalty) by Wisconsin, May 2018.
- Record on file since 1987, with 8 health-based violations before October 19, 2016.
- Lead pipe inventory: 143 lead and 5 unknown out of 2,220 service lines.
Check whether Lake Mills Waterworks serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Lead and Copper Rule
Treatment technique failure
|
350 | Sep 17, 2022 | Resolved | No |
|
Lead and Copper Rule
Treatment technique failure
|
350 | Oct 1, 2017 | Resolved | No |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 5.5 pCi/L, federal limit 5 pCi/L (1.1 times the limit)
|
340 | Jul 1, 2017 | Resolved | No |
|
Lead and Copper Rule
Treatment technique failure
|
350 | Apr 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2020 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2020 | Resolved |
|
Public Notice
OTHER
|
Jan 1, 2018 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Jun 23, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Jan 1, 2017 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2016 | Active |
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2016 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2014 | Active |
|
Public Notice
OTHER
|
Jan 1, 2012 | Active |
|
Public Notice
OTHER
|
Jan 1, 2012 | Active |
|
Public Notice
OTHER
|
Jan 1, 2011 | Active |
Full record since 1987
EPA's records for Lake Mills Waterworks go back to 1987. Before October 19, 2016 they list 8 health-based violations (7 resolved, 1 archived by EPA without a recorded fix) and 30 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 1 | 0 |
| 1990s | 1 | 2 |
| 2000s | 1 | 13 |
| 2010 to October 18, 2016 | 5 | 15 |
| October 19, 2016 to 2019 | 2 | 12 |
| 2020s | 1 | 2 |
Most recent health-based violation before October 19, 2016: Lead and Copper Rule, began April 2016, Resolved.
Show all 8 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Treatment technique failure
|
Apr 1, 2016 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 2016 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 2016 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 2012 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 2012 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 2009 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Jan 1, 1997 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 17, 1987 | Archived |
Enforcement actions
Wisconsin regulators took 3 formal enforcement actions against Lake Mills Waterworks between 2016 and 2018, filed as 4 records in EPA's data. The most recent was a compliance order (no penalty) in May 2018.
| Date | By | Action | Violations covered |
|---|---|---|---|
| May 4, 2018 | Wisconsin | Compliance order (no penalty) | 1 violation (1 health-based): Combined Radium (-226 and -228) |
| Mar 12, 2018 | Wisconsin | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Nov 21, 2016 | Wisconsin | Compliance order (no penalty) | 2 violations: Lead and Copper Rule |
What the violations mean
Lead and Copper Rule
3 incidentsThe system did not complete a treatment step or action that the Lead and Copper Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
Combined Radium (-226 and -228)
1 incidentTest results for Combined Radium (-226 and -228) were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about this violation.
Where the water comes from
Lake Mills Waterworks draws water from 3 wells.
Annual water quality report
Lake Mills Waterworks must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Wisconsin.
Certified drinking water labs by state EPA guidance for private wells