We read 8 results from Helena Water System’s 2024 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 32,091 people · Water system ID MT0000241 · Read the district’s 2024 report (opens in a new tab)
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Results from the 2024 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 · listed as a violation in the report · sampled 2023 · Tenmile treatment plant · 2024 report, page 2 | 5 ppb | 0.004 ppb | 10 ppb | Above the health goal1,250x the health goal |
| Lead90th percentile of 30 homes tested · listed as a violation in the report · Customer taps · 2024 report, page 2 | 5 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal25x the health goal |
| Chlorinehighest measured · range 0.1 to 1.77 · listed as a violation in the report · Distribution system · 2024 report, page 2 | 1.77 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 30 homes tested · listed as a violation in the report · Customer taps · 2024 report, page 2 | 0.3 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 24 to 64 · listed as a violation in the report · Distribution system (DBP-1) · 2024 report, page 2 | 41.8 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 28 to 67 · listed as a violation in the report · Distribution system (DBP-4) · 2024 report, page 2 | 50.5 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · listed as a violation in the report · sampled 2023 · Missouri River treatment plant · 2024 report, page 2 | 0.8 ppm | 1 ppm | 4 ppm | Below the health goal |
| Nitrate (as N)highest measured · listed as a violation in the report · Hale/Eureka sources · 2024 report, page 2 | 1.28 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 Helena Water System’s water between Jul 2023 and May 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- Lithium78 ppbFound in 3 of 9 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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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