MS / Bay St Louis
MS · Tap water records
Bay St Louis tap water, in plain English
Here is what the EPA's own data shows about tap water in Bay St Louis. According to EPA SDWIS data retrieved June 2026, Bay St Louis is served by 1 active community water system, together reported to serve about 9,284 people.
As of June 2026, EPA records show 42 violations across the community water system(s) serving Bay St Louis, going back to the earliest EPA record. 21 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
City Of Bay St Louis
9,284 served · groundwater · PWSID MS0230001 - Health-based TTHM: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 21 times between October 2022 and October 2024. The EPA record lists a level of 0.089 MG/L; the limit (MCL) is 0.08 MG/L. 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 12 times between October 2008 and December 2024. 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 6 times between July 2010 and July 2023. All have since returned to compliance, per EPA records.
- Monitoring Chlorine: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 3 times in October 2018. 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.