We read 10 results from Ammon City of’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 17,338 people · Water system ID ID7100004 · Read the district’s 2025 report (opens in a new tab)
Open this district in the water lookupCompare with your own test results, see the district map and get matched filters.
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 1 to 2 · 2025 report, page 2 | 2 ppb | 0.004 ppb | 10 ppb | Above the health goal500x the health goal |
| Radium (combined 226 + 228)highest measured · range 0.04 to 1.56 · sampled 2024 · 2025 report, page 2 | 1.56 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.1 to 0.15 · 2025 report, page 2 | 0.15 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chromium (total)highest measured · range 2 to 4 · 2025 report, page 2 | 4 ppb | None set | 100 ppb | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · 2025 report, page 2 | 0.12 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluoridehighest measured · range 0.2 to 0.2 · 2025 report, page 2 | 0.2 ppm | 1 ppm | 4 ppm | Below the health goal |
| Lead90th percentile of homes tested, 0 over the action level · sampled 2022 · 2025 report, page 2 | Not detected | 0.2 ppb | 15 ppb (action level) | Not detected |
| Nitrate (as N)highest measured · range 1.6 to 3.1 · 2025 report, page 2 | 3.1 ppm | 10 ppm | 10 ppm | Below the health goal |
| Hardnessas reported · 2025 report, page 2 | 13.9 gpg (238 ppm) | — | — | Very hard |
| Lithiumhighest measured · range 37 to 47.1 · printed as 0.0471 mg/L · 2025 report, page 2 | 47.1 ppb | 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Ammon City of’s water between May 2024 and Dec 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium47.1 ppbFound in 6 of 6 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.
Radium and uranium
Found: Radium (combined 226 + 228)
What removes it: Reverse osmosis.
More districts: Idaho water quality · All states · Something look wrong? Tell us