Public water system record
Prairie Du Sac Waterworks
Serves Prairie du Sac, Sauk County, WI · 4,006 people served
Federal records show 1 health-based violation and 3 monitoring/reporting issues for Prairie Du Sac Waterworks in the last ten years. The most serious issue in this window was a resolved LEAD AND COPPER RULE REVISIONS violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 3
Key facts
- Prairie Du Sac Waterworks draws water from 2 wells.
- Most recent formal enforcement: compliance order (no penalty) by Wisconsin, March 2015.
- Record on file since 1991, with 7 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 36 unknown out of 1,800 service lines.
Check whether Prairie Du Sac 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 REVISIONS
Treatment technique failure
|
350 | Oct 17, 2024 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Public Notice
OTHER
|
Oct 17, 2024 | Active |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
Full record since 1991
EPA's records for Prairie Du Sac Waterworks go back to 1991. Before October 19, 2016 they list 7 health-based violations (6 resolved, 1 archived by EPA without a recorded fix) and 1 monitoring or reporting violation.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 3 | 0 |
| 2000s | 1 | 0 |
| 2010 to October 18, 2016 | 3 | 1 |
| October 19, 2016 to 2019 | 0 | 2 |
| 2020s | 1 | 1 |
Most recent health-based violation before October 19, 2016: Nitrate (acute), began October 2014, Resolved.
Show all 7 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrate (acute)
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
Oct 1, 2014 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Oct 1, 2014 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 1994 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 1994 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1991 | Archived |
Enforcement actions
Wisconsin regulators took 1 formal enforcement action against Prairie Du Sac Waterworks and issued 1 boil water order between 2014 and 2015. The most recent was a compliance order (no penalty) in March 2015.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 20, 2015 | Wisconsin | Compliance order (no penalty) | 1 violation (1 health-based): Nitrate |
| Oct 10, 2014 | Wisconsin | Boil water order | 1 violation (1 health-based): Total Coliform |
What the violations mean
LEAD AND COPPER RULE REVISIONS
1 incidentThe system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
Prairie Du Sac Waterworks draws water from 2 wells.
Annual water quality report
Prairie Du Sac 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