We read 18 results from Cary’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 17,826 people · Water system ID IL1110100 · 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 |
|---|---|---|---|---|
| Gross alpha (radioactivity)as reported · range ND to 4.52 · 2025 report | 5 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 · 2025 report | 2.8 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal14x the health goal |
| Radium (combined 226 + 228)as reported · range 1.29 to 4.15 · 2025 report | 4 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.12 to 1.8 · sampled 2024 · 2025 report | 1.8 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorinehighest measured · range 0.8 to 1 · 2025 report | 1 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of homes tested, 0 over the action level · 2025 report | 0.15 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)as reported · range 1.57 to 3.78 · 2025 report | 4 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)as reported · range 10.4 to 21.9 · 2025 report | 22 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · range 0.54 to 0.77 · sampled 2024 · 2025 report | 0.77 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range ND to 0.18 · sampled 2024 · 2025 report | 0.18 ppm | — | 0.3 ppm guideline | Within the guideline |
| Manganesehighest measured · range ND to 0.02 · printed as 18 ppb · sampled 2024 · 2025 report | 0.02 ppm | — | 0.05 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 0.3 · sampled 2024 · 2025 report | 0.3 ppm | 10 ppm | 10 ppm | Below the health goal |
| Seleniumhighest measured · range ND to 1.4 · sampled 2024 · 2025 report | 1.4 ppb | 30 ppb | 50 ppb | Below the health goal |
| Zinchighest measured · range ND to 0.03 · sampled 2024 · 2025 report | 0.03 ppm | — | 5 ppm guideline | Within the guideline |
| PFBA (a PFAS)highest measured · range ND to 7.4 · printed as 0.0074 ppb · sampled 2024 · 2025 report | 7.4 ppt | None set | None | No health limit |
| PFHxA (a PFAS)highest measured · range ND to 6.9 · printed as 0.0069 ppb · sampled 2024 · 2025 report | 6.9 ppt | None set | None | No health limit |
| PFPeA (a PFAS)highest measured · range ND to 12 · printed as 0.012 ppb · sampled 2024 · 2025 report | 12 ppt | None set | None | No health limit |
| Sodiumhighest measured · range 40 to 120 · sampled 2024 · 2025 report | 120 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.
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.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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