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Public water system record

Jefferson Waterworks

Serves Jefferson, Jefferson County, WI · 7,926 people served

Federal records show 7 health-based violations and 2 monitoring/reporting issues for Jefferson Waterworks in the last ten years. The most serious issue in this window was a Combined Radium (-226 and -228) violation that EPA lists as archived, not resolved.

  • WI1280104
  • JEFFERSON
  • WI
  • 7,926 served

System profile

Source water Groundwater
ZIP 54549
EPA system ID WI1280104

Verify this system on EPA ECHO →

Health-based violations, last 10 years
7
Resolved
0
Unresolved
0
Archived by EPA
7
Any acute record
No
Monitoring issues, last 10 years
2

Key facts

  • Jefferson Waterworks draws water from 4 wells.
  • Highest measured level in the last 10 years: Combined Radium (-226 and -228), 7.81 pCi/L, federal limit 5 pCi/L (1.6 times the limit), 2023.
  • Most recent formal enforcement: compliance order (no penalty) by Wisconsin, May 2024.
  • Record on file since 1986, with 5 health-based violations before October 19, 2016.
  • Lead pipe inventory: 308 lead and 16 unknown out of 2,888 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.83 pCi/L, federal limit 5 pCi/L (1.4 times the limit)
 340 Apr 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.05 pCi/L, federal limit 5 pCi/L (1.4 times the limit)
 340 Jan 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.81 pCi/L, federal limit 5 pCi/L (1.6 times the limit)
 340 Oct 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.73 pCi/L, federal limit 5 pCi/L (1.5 times the limit)
 340 Jul 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 5.79 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 340 Apr 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.19 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 340 Jan 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Combined Radium (-226 and -228)
Contaminant limit exceeded
 340 Oct 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2024 Resolved
Public Notice
OTHER
 May 10, 2010 Active

Full record since 1986

EPA's records for Jefferson Waterworks go back to 1986. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 4 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 1 0
1990s 2 1
2000s 1 2
2010 to October 18, 2016 1 1
2020s 7 1

Most recent health-based violation before October 19, 2016: Gross Alpha, Excl. Radon and U, began January 2010, Resolved.

Show all 5 health-based violations before October 19, 2016
Contaminant Start date Status
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 19.1 pCi/L, federal limit 15 pCi/L (1.3 times the limit)
 Jan 1, 2010 Resolved
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 18.4 pCi/L, federal limit 15 pCi/L (1.2 times the limit)
 Apr 1, 2009 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 1993 Resolved
Lead and Copper Rule
Treatment technique failure
 Jan 1, 1993 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
 Jul 1, 1986 Resolved

Enforcement actions

Wisconsin regulators took 6 formal enforcement actions against Jefferson Waterworks between 2009 and 2024, filed as 9 records in EPA's data. The most recent was a compliance order (no penalty) in May 2024.

Date By Action Violations covered
May 11, 2024 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Feb 23, 2024 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Nov 11, 2023 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Aug 31, 2023 Wisconsin Compliance order (no penalty) 4 violations (4 health-based): Combined Radium (-226 and -228)
Aug 18, 2010 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Gross Alpha, Excl. Radon and U
Oct 8, 2009 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Gross Alpha, Excl. Radon and U

What the violations mean

Combined Radium (-226 and -228)

7 incidents

Test results for Combined Radium (-226 and -228) were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about each of these violations.

Where the water comes from

Jefferson Waterworks draws water from 4 wells.

Annual water quality report

Jefferson 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