We read 12 results from Woodstock’s 2025 water quality report. No results over a legal limit; 2 above a health goal or guideline.
Serves about 25,630 people · Water system ID IL1110950 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)highest measured · range 2.8 to 2.97 · listed as a violation in the report · sampled 2020 · Wells · 2025 report, page 5 | 2.97 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · range 0.23 to 1.28 · listed as a violation in the report · sampled 2020 · Wells · 2025 report, page 5 | 1.28 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.05 to 0.06 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 4 | 0.06 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest running annual average · range 1 to 1.2 · listed as a violation in the report · Distribution system · 2025 report, page 5 | 1.1 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest running annual average · range 22.1 to 34 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 34 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 30.8 to 58 · listed as a violation in the report · Distribution system · 2025 report, page 4 | 58 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.67 to 0.73 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 4 | 0.73 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range 0.02 to 0.03 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 5 | 0.03 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range 0.0042 to 0.03 · listed as a violation in the report · printed as 25 ppb · sampled 2024 · Wells · 2025 report, page 4 | 0.03 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · listed as a violation in the report · Wells · 2025 report, page 4 | 2 ppm | 10 ppm | 10 ppm | Below the health goal |
| Zinchighest measured · range ND to 0.0092 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 4 | 0.0092 ppm | — | 5 ppm guideline | Within the guideline |
| Sodiumhighest measured · range 150 to 230 · listed as a violation in the report · sampled 2024 · Wells · 2025 report, page 5 | 230 ppm | 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. 2 numbers we weren’t sure about are 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), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
More districts: Illinois water quality · All states · Something look wrong? Tell us