We read 11 results from City of Denham Springs Water System’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 25,725 people · Water system ID LA1063004 · 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 |
|---|---|---|---|---|
| Arsenichighest measured · range ND to 1.1 · Source water · 2025 report, page 4 | 1.1 ppb | 0.004 ppb | 10 ppb | Above the health goal275x the health goal |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 4 | 1 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal5x the health goal |
| Chlorinehighest running annual average · range ND to 3.2 · Distribution system · 2025 report, page 4 | 1.5 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 4 | Not detected | 0.3 ppm | 1.3 ppm (action level) | Not detected |
| Disinfection byproducts (HAA5)highest running annual average · range 9.3 to 13.7 · 30593 Fairway View / Johnson Road · 2025 report, page 5 | 11 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 19.5 to 33.8 · Johnson Road · 2025 report, page 5 | 27 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · Source water · 2025 report, page 4 | 0.1 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · range ND to 0.2 · Treated water · 2025 report, page 4 | 0.2 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range ND to 9 · Source water · 2025 report, page 4 | 9 ppb | 30 ppb | 50 ppb | Below the health goal |
| Hardnesshighest measured · range 0.14 to 0.57 · sampled 2023 · Treated water · 2025 report, page 5 | 0.57 gpg (9.7 ppm) | — | — | Soft |
| Sodiumhighest measured · range 56.8 to 79.5 · sampled 2023 · Treated water · 2025 report, page 5 | 79.5 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Denham Springs Water System’s water between Dec 2023 and Jun 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium12.9 ppbFound in 10 of 10 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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