F0/100
CITY OF BAY ST LOUIS — Water Quality Report 2026
Serving 9,284 people · Mississippi
Water Source
Groundwater
County
—
System ID
MS0230001
Violations
201
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.009 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
10
Violations (last 5yr)
0
Unresolved
5
Health-Related
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: December 7, 2024 – December 18, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2024 – September 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: May 27, 2024 – May 31, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: April 1, 2024 – June 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – September 29, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: June 4, 2023 – June 28, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: March 10, 2023 – April 21, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: January 1, 2023 – March 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2022 – December 31, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CITY OF BAY ST LOUIS
Is CITY OF BAY ST LOUIS water safe to drink?
CITY OF BAY ST LOUIS water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 201 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CITY OF BAY ST LOUIS detected?
31 contaminants were tested in CITY OF BAY ST LOUIS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CITY OF BAY ST LOUIS have any EPA violations?
Yes, CITY OF BAY ST LOUIS has 201 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MCL, MR. 8 are health-based violations.
How many people does CITY OF BAY ST LOUIS serve?
CITY OF BAY ST LOUIS serves approximately 9,284 people, Mississippi. The system provides water to 1 community: Bay St Louis.
What type of water does CITY OF BAY ST LOUIS provide?
CITY OF BAY ST LOUIS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MS0230001.
How does CITY OF BAY ST LOUIS compare to other utilities in Mississippi?
CITY OF BAY ST LOUIS scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Mississippi state page for a full comparison of water systems.