Does Lancaster, MN tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 84 violation(s) across the community water systems serving Lancaster, of which 46 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Lancaster, MN tap water come from?

Lancaster is served by 2 active community water system(s). Their primary sources, per EPA records, are: groundwater.

MN / Lancaster

MN · Tap water records

Lancaster tap water, in plain English

Here is what the EPA's own data shows about tap water in Lancaster. According to EPA SDWIS data retrieved June 2026, Lancaster is served by 2 active community water systems, together reported to serve about 511 people.

As of June 2026, EPA records show 84 violations across the community water system(s) serving Lancaster, going back to the earliest EPA record. 46 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.

2

Community water systems
~511

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Lancaster

361 served · groundwater · PWSID MN1350005

Monitoring Chlorine: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in January 2022. EPA records do not show all of these as returned to compliance.

Oak Manor Mobile Home Park

150 served · groundwater · PWSID MN1680004

Health-based Arsenic: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 46 times between April 2018 and October 2025. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
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 February 2024 and February 2026. EPA records do not show all of these as returned to compliance.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 9 times between July 1993 and October 2025. EPA records do not show all of these as returned to compliance.
Monitoring Revised Total Coliform Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 20 times between October 2018 and October 2025. EPA records do not show all of these as returned to compliance.

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.