We read 11 results from Kuna City of’s 2021 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 32,038 people · Water system ID ID4010085 · Read the district’s 2021 report (opens in a new tab)
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Results from the 2021 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 1 to 8 · listed as a violation in the report · printed as 0.008 mg/L · sampled 2019 · Wells · 2021 report, page 2 | 8 ppb | 0.004 ppb | 10 ppb | Above the health goal2,000x the health goal |
| Fluoridehighest measured · range ND to 1.05 · listed as a violation in the report · Wells · 2021 report, page 2 | 1.05 ppm | 1 ppm | 4 ppm | Above the health goal1.1x the health goal |
| Gross alpha (radioactivity)highest measured · range 7.57 to 7.87 · listed as a violation in the report · sampled 2019 · Wells · 2021 report, page 2 | 7.87 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Uraniumhighest measured · range 1 to 21 · listed as a violation in the report · sampled 2019 · Wells · 2021 report, page 2 | 21 ppb | 0.6 ppb | 30 ppb | Above the health goal35x the health goal |
| Bariumhighest measured · range 0.05 to 0.09 · listed as a violation in the report · sampled 2019 · Wells · 2021 report, page 2 | 0.09 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineaverage · listed as a violation in the report · Distribution system · 2021 report, page 2 | 0.38 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested, 0 over the action level · listed as a violation in the report · sampled 2020 · Customer taps · 2021 report, page 2 | 0.04 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest measured · range 1 to 2 · listed as a violation in the report · printed as 0.002 mg/L · Distribution system · 2021 report, page 2 | 2 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · listed as a violation in the report · printed as 0.004 mg/L · Distribution system · 2021 report, page 2 | 4 ppb | None set | 80 ppb | Below the legal limit |
| Lead90th percentile of 30 homes tested, 0 over the action level · listed as a violation in the report · printed as 0.000 mg/L · sampled 2020 · Customer taps · 2021 report, page 2 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range ND to 4.3 · listed as a violation in the report · Wells · 2021 report, page 2 | 4.3 ppm | 10 ppm | 10 ppm | Below the health goal |
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 Kuna City of’s water between Oct 2024 and Apr 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium21 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.
Fluoride
Found: Fluoride
What removes it: Reverse osmosis.
Radium and uranium
Found: Gross alpha (radioactivity), Uranium
What removes it: Reverse osmosis.
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