We read 11 results from Onida’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 658 people · Water system ID SD4600233 · 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 2 to 2 · sampled 2022 · Mid-Dakota Rural Water · 2025 report, page 4 | 2 ppb | 0.004 ppb | 10 ppb | Above the health goal500x the health goal |
| Gross alpha (radioactivity)highest measured · range ND to 4 · sampled 2022 · Mid-Dakota Rural Water · 2025 report, page 4 | 4 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 4 | 2 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal10x the health goal |
| Antimonyhighest measured · range 0.32 to 0.32 · sampled 2022 · Mid-Dakota Rural Water · 2025 report, page 4 | 0.32 ppb | 1 ppb | 6 ppb | Below the health goal |
| Bariumhighest measured · range 0.03 to 0.03 · sampled 2022 · Mid-Dakota Rural Water · 2025 report, page 4 | 0.03 ppm | 2 ppm | 2 ppm | Below the health goal |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 4 | 0.2 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · Mid-Dakota Rural Water, highest of 2 sources · 2025 report, page 4 | 20.9 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · Mid-Dakota Rural Water, highest of 2 sources · 2025 report, page 5 | 44.7 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.5 to 0.5 · Mid-Dakota Rural Water · 2025 report, page 4 | 0.5 ppm | 1 ppm | 4 ppm | Below the health goal |
| Seleniumhighest measured · range 0.96 to 0.96 · sampled 2022 · Mid-Dakota Rural Water · 2025 report, page 4 | 0.96 ppb | 30 ppb | 50 ppb | Below the health goal |
| Turbidity (cloudiness)highest measured · Mid-Dakota Rural Water · 2025 report, page 5 | 0.08 NTU | None set | 1 NTU | Below the legal 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)
What removes it: Reverse osmosis.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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