We read 6 results from Hermosa-Old System’s 2025 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 420 people · Water system ID SD4600154 · 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 |
|---|---|---|---|---|
| Copper90th percentile of homes tested, 0 over the action level · sampled 2023 · Customer taps · 2025 report, page 3 | 0.5 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal1.7x the health goal |
| Gross alpha (radioactivity)highest measured · range 5 to 13 · sampled 2023 · 2025 report, page 3 | 13 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 3 | 7 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal35x the health goal |
| Radium (combined 226 + 228)highest measured · range 2 to 4 · sampled 2023 · 2025 report, page 3 | 4 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Uraniumhighest measured · range ND to 13 · sampled 2022 · 2025 report, page 3 | 13 ppb | 0.6 ppb | 30 ppb | Above the health goal22x the health goal |
| Nitrate (as N)highest measured · 2025 report, page 3 | 0.11 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.
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: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228), Uranium
What removes it: Reverse osmosis.
More districts: South Dakota water quality · All states · Something look wrong? Tell us