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Bay St. Louis, MS Tap Water Quality 2026

Water quality report for Bay St. Louis, MS — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Bay St. Louis's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: City Of Bay St Louis PWSID: MS0230001 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 9.00 ppb, 60% of the action level and no violations are open. No PFAS was detected.

D

Bay St. Louis earns a D for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 9.00 ppb — 60% of the federal action level
PFAS tested, none detected
11 violations since 2015, 5 health-based
No violations currently open
Bay St. Louis's lead level vs. all Mississippi community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 9.00 ppb — 60% of the federal action level
✓ Lower lead than 2% of Mississippi utilities
Population Served
7592
~3847 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
11 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
60% of EPA action level
9.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 9.00 ppb, 60% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Public Notice OTHER — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2024 Resolved
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2024 Resolved
Public Notice OTHER — — 2024 Resolved
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2024 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
Public Notice OTHER — — 2023 Resolved
Public Notice OTHER — — 2023 Resolved
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2023 Resolved
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2022 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2018 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

11 violations are on record since 2015, of which 5 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility City Of Bay St Louis
PWSID MS0230001
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 7,592
Service connections 3,847
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Bay St. Louis tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 9.00 ppb, 60% of the action level.
Does Bay St. Louis water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Bay St. Louis? ▼
City Of Bay St Louis (PWSID MS0230001), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-06-25. Inspectors recorded 3 significant deficiencies.

What Should Bay St. Louis Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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