We read 5 results from City of Bay St Louis’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 9,284 people · Water system ID MS0230001 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Arsenicas reported · range 0.9 to 1.3 · 2025 report, page 2 | 1.3 ppb | 0.004 ppb | 10 ppb | Above the health goal325x the health goal |
| Bariumas reported · range 0.01 to 0.01 · 2025 report, page 2 | 0.01 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)as reported · range 10.6 to 12.8 · 2025 report, page 2 | 12.8 ppb | None set | 100 ppb | Below the legal limit |
| Fluorideas reported · range 0.48 to 0.58 · 2025 report, page 2 | 0.58 ppm | 1 ppm | 4 ppm | Below the health goal |
| Sodiumas reported · range 115 to 164 · sampled 2024 · 2025 report, page 2 | 164 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 2 numbers we weren’t sure about are held back until a person checks.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Bay St Louis’s water between Feb 2024 and Jan 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium15.4 ppbFound in 8 of 8 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
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