WI / Tomah
WI · Tap water records
Tomah tap water, in plain English
Here is what the EPA's own data shows about tap water in Tomah. According to EPA SDWIS data retrieved June 2026, Tomah is served by 1 active community water system, together reported to serve about 9,192 people.
As of June 2026, EPA records show 23 violations across the community water system(s) serving Tomah, going back to the earliest EPA record. 17 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.
What the EPA has on record, by system
Tomah Waterworks
9,192 served · groundwater · PWSID WI6420254 - Health-based Nitrate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times in April 2025. The EPA record lists a level of 11.13 MG/L; the limit (MCL) is 10.5 MG/L. EPA records do not show all of these as returned to compliance.
- Health-based Combined Radium (-226 and -228): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 15 times between October 2014 and April 2018. The EPA record lists a level of 5.78 PCI/L; the limit (MCL) is 5.5 PCI/L. All have since returned to compliance, per EPA records.
- Monitoring Public Notice: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 6 times between July 2015 and February 2017. All have since returned to compliance, per EPA records.
What this means
A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.
This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.
Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.