We read 6 results from Hilo’s 2025 water quality report. No results over a legal limit; 1 above a health goal or guideline.
Serves about 39,477 people · Water system ID HI0000101 · 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 |
|---|---|---|---|---|
| Gross beta (radioactivity)single sample · listed as a violation in the report · sampled 2021 · Sources · 2025 report, page 3 | 3 pCi/L | 0 pCi/L | 50 pCi/L | Above the health goalThe health goal is zero |
| Copper90th percentile of 32 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2025 report, page 3 | 0.07 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluoridehighest measured · range ND to 0.2 · listed as a violation in the report · Sources · 2025 report, page 3 | 0.2 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of 32 homes tested, 0 over the action level · listed as a violation in the report · Customer taps · 2025 report, page 3 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range ND to 0.37 · listed as a violation in the report · Sources · 2025 report, page 3 | 0.37 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sodiumhighest measured · range 5.5 to 8.9 · listed as a violation in the report · sampled 2023 · Sources · 2025 report, page 4 | 8.9 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.
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 beta (radioactivity)
What removes it: Reverse osmosis.
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