We read 13 results from Lahaina’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 20,065 people · Water system ID HI0000214 · 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 · printed as 0.001 ppm · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 20 | 1 ppb | 0.004 ppb | 10 ppb | Above the health goal250x the health goal |
| Gross alpha (radioactivity)highest measured · range ND to 3.5 · sampled 2020 · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 20 | 3.5 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Gross beta (radioactivity)highest measured · range ND to 3.9 · sampled 2020 · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 20 | 3.9 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 21 | 0.47 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal2.3x the health goal |
| Bariumhighest measured · range ND to 0.01 · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 20 | 0.01 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)highest measured · range ND to 12 · printed as 0.012 ppm · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 20 | 12 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2024 · Customer taps · 2025 report, page 21 | 0.04 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range ND to 24 · Distribution system · 2025 report, page 20 | 24 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 1.7 to 48 · Distribution system · 2025 report, page 20 | 48 ppb | None set | 80 ppb | Below the legal limit |
| Nitrate (as N)highest measured · range ND to 0.17 · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 20 | 0.17 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range ND to 7 · printed as 0.007 ppm · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 20 | 7 ppb | 30 ppb | 50 ppb | Below the health goal |
| Sulfatehighest measured · range 1 to 34 · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 22 | 34 ppm | — | 250 ppm guideline | Within the guideline |
| Sodiumhighest measured · range 8.9 to 120 · Source water (wells + Kanaha/Honolua surface) · 2025 report, page 22 | 120 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. 1 number we weren’t sure about is held back until a person checks.
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.
Radium and uranium
Found: Gross alpha (radioactivity), Gross beta (radioactivity)
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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