We read 21 results from Big Island Water Company’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 175 people · Water system ID MO3031265 · 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 alpha (radioactivity)highest measured · range 5.7 to 5.7 · 2025 report, page 2 | 5.7 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Ironhighest measured · range 2.42 to 2.42 · sampled 2024 · 2025 report, page 3 | 2.42 ppm | — | 0.3 ppm guideline | Above the guideline8.1x the guideline (taste, odor or stains; not a health limit) |
| Radium (combined 226 + 228)highest measured · range 1.5 to 1.5 · 2025 report, page 2 | 1.5 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Radium-226highest measured · range 1.5 to 1.5 · 2025 report, page 2 | 1.5 pCi/L | 0.05 pCi/L | 5 pCi/L | Above the health goal30x the health goal |
| Aluminumhighest measured · range 0.04 to 0.04 · sampled 2024 · 2025 report, page 3 | 0.04 ppm | — | 0.2 ppm guideline | Within the guideline |
| Bariumhighest measured · range 0.02 to 0.02 · sampled 2024 · 2025 report, page 2 | 0.02 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chloridehighest measured · range 58 to 58 · sampled 2024 · 2025 report, page 3 | 58 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2020 · Customer taps · 2025 report, page 2 | 0.07 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluoridehighest measured · range 0.34 to 0.34 · sampled 2024 · 2025 report, page 2 | 0.34 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2020 · Customer taps · 2025 report, page 2 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Manganesehighest measured · range 0.04 to 0.04 · sampled 2024 · 2025 report, page 3 | 0.04 ppm | — | 0.05 ppm guideline | Within the guideline |
| pHhighest measured · range 8.28 to 8.28 · sampled 2024 · 2025 report, page 3 | 8.28 | — | — | Normal range |
| Sulfatehighest measured · range 18.1 to 18.1 · sampled 2024 · 2025 report, page 3 | 18.1 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidshighest measured · range 325 to 325 · sampled 2024 · 2025 report, page 3 | 325 ppm | — | 500 ppm guideline | Within the guideline |
| Zinchighest measured · range 0.22 to 0.22 · sampled 2024 · 2025 report, page 3 | 0.22 ppm | — | 5 ppm guideline | Within the guideline |
| Alkalinityhighest measured · range 193 to 193 · sampled 2024 · 2025 report, page 3 | 193 ppm | None set | None | No health limit |
| Calciumhighest measured · range 13.4 to 13.4 · sampled 2024 · 2025 report, page 3 | 13.4 ppm | None set | None | No health limit |
| Hardnesshighest measured · range 3.35 to 3.35 · sampled 2024 · 2025 report, page 3 | 3.35 gpg (57.3 ppm) | — | — | Soft |
| Magnesiumhighest measured · range 5.79 to 5.79 · sampled 2024 · 2025 report, page 3 | 5.79 ppm | None set | None | No health limit |
| Nickelhighest measured · range 1.1 to 1.1 · printed as 0.0011 MG/L · sampled 2024 · 2025 report, page 3 | 1.1 ppb | None set | None | No health limit |
| Potassiumhighest measured · range 2.18 to 2.18 · sampled 2024 · 2025 report, page 3 | 2.18 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 alpha (radioactivity), Radium (combined 226 + 228), Radium-226
What removes it: Reverse osmosis.
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