No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting October 2024.
Serves about 9,284 people (3,847 connections) with groundwater from its own wells.
From EPA's record for MS0230001. PurityMap is independent of City of Bay St Louis.
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5 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| Oct–Dec 2024 | Total trihalomethanes (TTHM) | 0.083 mg/L | 0.080 mg/L | Resolved |
| Jul–Sep 2024 | Total trihalomethanes (TTHM) | 0.085 mg/L | 0.080 mg/L | Resolved |
| Apr–Jun 2024 | Total trihalomethanes (TTHM) | 0.082 mg/L | 0.080 mg/L | Resolved |
| Jan–Mar 2023 | Total trihalomethanes (TTHM) | 0.084 mg/L | 0.080 mg/L | Resolved |
| Oct–Dec 2022 | Total trihalomethanes (TTHM) | 0.089 mg/L | 0.080 mg/L | Resolved |
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2024 to January 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 15.4 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2024-02-28 to 2025-01-15 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-15 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-15 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-15 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-15 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2024-02-28 to 2025-01-30 | UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →City of Bay St Louis's phone number on EPA record is 228-467-5505. Its mailing address is 688 HWY 90, BAY ST LOUIS, MS 39520.
According to EPA's record, City of Bay St Louis uses groundwater from its own wells.
EPA's record shows 5 health-based violations for City of Bay St Louis in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting October 2024. EPA also lists 6 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in City of Bay St Louis's latest lead and copper round, which ended in December 2024, was 9 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for City of Bay St Louis. Its phone number on EPA record is 228-467-5505. Its mailing address on EPA record is 688 HWY 90, BAY ST LOUIS, MS 39520. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.