We read 10 results from Belvidere’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 25,070 people · Water system ID IL0070050 · Read the district’s 2025 report (opens in a new tab)
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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 0.45 to 0.45 · sampled 2019 · Wells · 2025 report, page 1 | 0.45 ppb | 0.004 ppb | 10 ppb | Above the health goal113x the health goal |
| Gross alpha (radioactivity)highest measured · range 4.68 to 4.68 · sampled 2022 · Wells · 2025 report, page 1 | 4.68 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Radium (combined 226 + 228)highest measured · range 0.93 to 0.93 · Wells · 2025 report, page 1 | 0.93 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.64 to 0.64 · Wells · 2025 report, page 1 | 0.64 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineas reported · range 0.6 to 1 · Distribution system · 2025 report, page 1 | 0.8 ppm | None set | 4 ppm | Below the legal limit |
| Disinfection byproducts (HAA5)highest measured · Distribution system · 2025 report, page 1 | 9 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · Distribution system · 2025 report, page 1 | 16 ppb | None set | 80 ppb | Below the legal limit |
| Nitrate (as N)highest measured · range 2.2 to 2.2 · Wells · 2025 report, page 1 | 2.2 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)single sample · Entry point TP03 · 2025 report, page 2 | 5.5 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| Sodiumhighest measured · range 11 to 11 · Wells · 2025 report, page 1 | 11 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Belvidere’s water between Sep 2024 and Mar 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFHxS5.5 pptFound in 2 of 10 samples · highest resultNo federal limit in force for this one
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: Gross alpha (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
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