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Public water system record

Tomah Waterworks

Serves Tomah, Monroe County, WI · 9,192 people served

Federal records show 8 health-based violations and 3 monitoring/reporting issues for Tomah Waterworks in the last ten years. The most serious issue in this window was a Nitrate violation that EPA lists as archived, not resolved.

  • WI6420254
  • TOMAH
  • WI
  • 9,192 served

System profile

Source water Groundwater
ZIP 54660
EPA system ID WI6420254

Verify this system on EPA ECHO →

Health-based violations, last 10 years
8
Resolved
7
Unresolved
0
Archived by EPA
1
Any acute record
Yes
Monitoring issues, last 10 years
3

Key facts

  • Tomah Waterworks draws water from 4 wells.
  • Highest measured level in the last 10 years: Combined Radium (-226 and -228), 7.33 pCi/L, federal limit 5 pCi/L (1.5 times the limit), 2018.
  • Most recent formal enforcement: compliance order (no penalty) by Wisconsin, August 2025.
  • Record on file since 1993, with 11 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 3,448 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
Nitrate
Contaminant limit exceeded
Measured 11.13 mg/L, federal limit 10 mg/L (1.1 times the limit)
 330 Apr 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.95 pCi/L, federal limit 5 pCi/L (1.4 times the limit)
 340 Apr 1, 2018 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.33 pCi/L, federal limit 5 pCi/L (1.5 times the limit)
 340 Jan 1, 2018 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.75 pCi/L, federal limit 5 pCi/L (1.4 times the limit)
 340 Oct 1, 2017 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.35 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 340 Jul 1, 2017 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.35 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 340 Apr 1, 2017 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.13 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 340 Jan 1, 2017 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.5 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 340 Oct 1, 2016 Resolved No

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Public Notice
OTHER
 Feb 15, 2017 Resolved
Public Notice
OTHER
 Jul 26, 2016 Resolved
Public Notice
OTHER
 Jul 26, 2016 Resolved

Full record since 1993

EPA's records for Tomah Waterworks go back to 1993. Before October 19, 2016 they list 11 health-based violations (10 resolved, 1 archived by EPA without a recorded fix) and 5 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 2 0
2010 to October 18, 2016 9 5
October 19, 2016 to 2019 6 1
2020s 1 0

Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began October 2016, Resolved.

Show all 11 health-based violations before October 19, 2016
Contaminant Start date Status
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.5 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 Oct 1, 2016 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.53 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 Jul 1, 2016 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.45 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 Apr 1, 2016 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6.54 pCi/L, federal limit 5 pCi/L (1.3 times the limit)
 Jan 1, 2016 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.59 pCi/L, federal limit 5 pCi/L (1.5 times the limit)
 Oct 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.59 pCi/L, federal limit 5 pCi/L (1.5 times the limit)
 Jul 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.47 pCi/L, federal limit 5 pCi/L (1.5 times the limit)
 Apr 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.33 pCi/L, federal limit 5 pCi/L (1.5 times the limit)
 Jan 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 5.78 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Oct 1, 2014 Resolved
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 17 pCi/L, federal limit 15 pCi/L (1.1 times the limit)
 Jan 1, 1996 Resolved
ETHYLENE DIBROMIDE
Contaminant limit exceeded
 Jan 1, 1993 Archived

Enforcement actions

Wisconsin regulators took 14 formal enforcement actions against Tomah Waterworks between 2003 and 2025, filed as 17 records in EPA's data. The most recent was a compliance order (no penalty) in August 2025.

Date By Action Violations covered
Aug 22, 2025 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Nitrate
Jun 7, 2018 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Feb 9, 2018 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Dec 7, 2017 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Sep 19, 2017 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
May 4, 2017 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Feb 15, 2017 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Oct 26, 2016 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Jul 26, 2016 Wisconsin Compliance order (no penalty) 2 violations (2 health-based): Combined Radium (-226 and -228)
Apr 22, 2016 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Oct 6, 2015 Wisconsin Compliance order (no penalty) 2 violations (2 health-based): Combined Radium (-226 and -228)
Jul 2, 2015 Wisconsin Compliance order (no penalty) 1 violation (1 health-based): Combined Radium (-226 and -228)
Jun 18, 2015 Wisconsin Compliance order (no penalty) 2 violations (2 health-based): Combined Radium (-226 and -228)
Dec 4, 2003 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.

Nitrate

1 incident

Nitrate exceeded the federal limit

High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome

Where the water comes from

Tomah Waterworks draws water from 4 wells.

Annual water quality report

Tomah 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