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Water system · PWSID MS0230001

CITY OF BAY ST LOUIS

BAY ST LOUIS, MS · ~9,284 people served

Check your exact address → BAY ST LOUIS overview
100
Excellent
PurityRadar safety score

PWSID

MS0230001

State

Mississippi

City

BAY ST LOUIS

Population served

9,284

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Jan 2025). Levels in parts per trillion (ppt).

Lithium

12,000 ppt

limit —

No federal limit

Violations & enforcement

198

Violations on record

0

Unaddressed

5

Health-based

180

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2025. Official EPA record →

Other · EPA contaminant 7500 began Dec 2024 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2024 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2024 Resolved
Other · EPA contaminant 7500 began May 2024 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Apr 2024 Resolved
Other · EPA contaminant 7000 began Jul 2023 Resolved
Other · EPA contaminant 7500 began Jun 2023 Resolved
Other · EPA contaminant 7500 began Mar 2023 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jan 2023 Resolved
Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Oct 2022 Resolved
Monitoring & reporting · EPA contaminant 0999 began Oct 2018 Resolved
Monitoring & reporting · EPA contaminant 4020 began Oct 2012 Resolved

Recent enforcement actions

  • State action · SO+ Sep 2025
  • State action · SIF Apr 2025
  • State action · SOX Apr 2025
  • State action · SOX Feb 2025
  • State action · SO+ Jan 2025
  • State action · SO+ Jan 2025
  • State action · SO+ Jan 2025
  • State action · SO+ Jan 2025

This profile is built from EPA public records for system MS0230001 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.