Does Mount Vernon, IL tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 18 violation(s) across the community water systems serving Mount Vernon, of which 0 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Mount Vernon, IL tap water come from?

Mount Vernon is served by 1 active community water system(s). Their primary sources, per EPA records, are: surface water.

IL / Mount Vernon

IL · Tap water records

Mount Vernon tap water, in plain English

Here is what the EPA's own data shows about tap water in Mount Vernon. According to EPA SDWIS data retrieved June 2026, Mount Vernon is served by 1 active community water system, together reported to serve about 15,793 people.

As of June 2026, EPA records show 18 violations across the community water system(s) serving Mount Vernon, going back to the earliest EPA record. None were health-based; the records are monitoring or reporting violations (a required test or report was late or missed). Each is listed by system below, with its status.

1

Community water system
~15,793

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Mount Vernon

15,793 served · surface water · PWSID IL0810300

Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 6 times between July 2004 and July 2024. All have since returned to compliance, per EPA records.
Monitoring Total Haloacetic Acids (HAA5): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 10 times between April 2023 and October 2023. 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 2 times in December 2020. 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.