Short answer: No measured result is above a legal limit; lithium sits above a screening level. City of Bay St Louis serves 9,284 residents.
This report uses the largest, CITY OF BAY ST LOUIS. Your water bill or annual water quality report names your actual supplier.
Source: EPA SDWIS 2026Q2.
CITY OF BAY ST LOUIS (EPA PWSID MS0230001) delivers groundwater to 9,284 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
3health-based violations in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score. All 5 EPA filings are listed below.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Every filing is listed; the Track record score counts at most one per contaminant per year.
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Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
lead 9 µg/L, below the 15 µg/L action level
Lithium 15.4 µg/L, above the 10.0 µg/L EPA health reference level
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
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
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.
When your results arrive, read them here →
Each card names which Bay St. Louis findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Bay St. Louis, no regulated PFAS were detected in EPA's 2024 testing; the lead 90th-percentile result was 9 µg/L against the 15 µg/L action level. CITY OF BAY ST LOUIS (PWSID MS0230001) has a Purity Score of 85/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
CITY OF BAY ST LOUIS (PWS ID MS0230001) is the public water system on record for Bay St. Louis, Mississippi, serving about 9,284 people. Confirm the utility on your water bill before acting on a specific finding.
Groundwater (primary source of record in EPA SDWIS).
None of the 29 PFAS in EPA's UCMR 5 testing (2024-02-28 to 2025-01-30) was detected. "Not detected" means below the lab's reporting limit, not proven zero.
CITY OF BAY ST LOUIS's most recent lead 90th-percentile result (2022–2024) was 9 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
PurityMap's current record for Bay St. Louis holds 31 findings: 1 above a reference, 1 detected within the reference and 29 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
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| Contaminant | Result | Benchmark | 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) |
| Lead (90th percentile) | 9 µg/L | 15 µg/L federal action level | Below the listed reference | 2022–2024 monitoring period | Lead & Copper Rule 90th-percentile: CITY OF BAY ST LOUIS (MS0230001) |
| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| 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) |
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorooctanesulfonic acid (PFOS)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: CITY OF BAY ST LOUIS (MS0230001)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: CITY OF BAY ST LOUIS (MS0230001)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where City of Bay St Louis reported something related, it's shown below.
Lead at City of Bay St Louis: 9 µg/L (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.