MO / Monroe
MO · Tap water records
Monroe tap water, in plain English
Here is what the EPA's own data shows about tap water in Monroe. According to EPA SDWIS data retrieved June 2026, Monroe is served by 1 active community water system, together reported to serve about 2,500 people.
As of June 2026, EPA records show 150 violations across the community water system(s) serving Monroe, going back to the earliest EPA record. 93 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
Monroe City Pws
2,500 served · surface water · PWSID MO2010538 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 54 times between January 2019 and October 2025. The EPA record lists a level of 92 UG/L; the limit (MCL) is 80 UG/L. EPA records do not show all of these as returned to compliance.
- Health-based Total Haloacetic Acids (HAA5): a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 3 times between July 2025 and October 2025. The EPA record lists a level of 65.03 UG/L; the limit (MCL) is 60 UG/L. EPA records do not show all of these as returned to compliance.
- Health-based Interim Enhanced Surface Water Treatment Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 36 times between February 2016 and June 2018. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Monitoring Simazine: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Metolachlor: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Atrazine: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. EPA records do not show all of these as returned to compliance.
- Monitoring LASSO: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. EPA records do not show all of these as returned to compliance.
- Monitoring CYANAZINE: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Butachlor: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Propachlor: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. EPA records do not show all of these as returned to compliance.
- Monitoring Metribuzin: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 5 times between April 2022 and October 2025. 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 13 times between March 2018 and July 2025. All have since returned to compliance, per EPA records.
- Monitoring Consumer Confidence Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 4 times in July 2022. 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.