We read 20 results from Lockport’s 2024 water quality report. No results over a legal limit; 5 above a health goal or guideline.
Serves about 23,100 people · Water system ID IL1970500 · 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 · range 0.43 to 0.82 · Wells · 2024 report, page 7 | 0.82 ppb | 0.004 ppb | 10 ppb | Above the health goal205x the health goal |
| Copper90th percentile of homes tested · Customer taps · 2024 report, page 6 | 0.91 ppm | 0.3 ppm | 1.3 ppm (action level) | Above the health goal3x the health goal |
| Gross alpha (radioactivity)highest measured · sampled 2023 · Wells · 2024 report, page 8 | 5.13 pCi/L | 0 pCi/L | 15 pCi/L | Above the health goalThe health goal is zero |
| Lead90th percentile of homes tested · Customer taps · 2024 report, page 6 | 4.9 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal25x the health goal |
| Radium (combined 226 + 228)highest measured · sampled 2023 · Wells · 2024 report, page 8 | 1.33 pCi/L | 0 pCi/L | 5 pCi/L | Above the health goalThe health goal is zero |
| Bariumhighest measured · range 0.02 to 0.04 · Wells · 2024 report, page 7 | 0.04 ppm | 2 ppm | 2 ppm | Below the health goal |
| Chlorineas reported · range 0.7 to 1 · Distribution system · 2024 report, page 7 | 0.8 ppm | None set | 4 ppm | Below the legal limit |
| Chromium (total)highest measured · range 3.08 to 4.88 · Wells · 2024 report, page 7 | 4.88 ppb | None set | 100 ppb | Below the legal limit |
| Disinfection byproducts (HAA5)highest measured · range 4.7 to 9.1 · Distribution system · 2024 report, page 7 | 9 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest measured · range 18.7 to 33 · Distribution system · 2024 report, page 7 | 33 ppb | None set | 80 ppb | Below the legal limit |
| Fluoridehighest measured · Wells · 2024 report, page 7 | 0.24 ppm | 1 ppm | 4 ppm | Below the health goal |
| Ironhighest measured · range ND to 0.22 · Wells · 2024 report, page 7 | 0.22 ppm | — | 0.3 ppm guideline | Within the guideline |
| Nitrate (as N)highest measured · range ND to 0.29 · Wells · 2024 report, page 7 | 0.29 ppm | 10 ppm | 10 ppm | Below the health goal |
| PFHxS (a PFAS)highest measured · range 5.6 to 7.4 · Well 11 · 2024 report, page 8 | 7.4 ppt | None set | 10 ppt from 2029 | Below the legal limit |
| Seleniumhighest measured · range 0.81 to 2.19 · Wells · 2024 report, page 7 | 2.19 ppb | 30 ppb | 50 ppb | Below the health goal |
| Zinchighest measured · range 0.0062 to 0.01 · Wells · 2024 report, page 8 | 0.01 ppm | — | 5 ppm guideline | Within the guideline |
| Lithiumhighest measured · range 22.4 to 64.7 · Wells · 2024 report, page 8 | 64.7 ppb | None set | None | No health limit |
| PFBS (a PFAS)highest measured · range 1.09 to 3.07 · Well 11 · 2024 report, page 8 | 3.07 ppt | None set | None | No health limit |
| PFHxA (a PFAS)highest measured · range 2.4 to 3.99 · Well 11 · 2024 report, page 8 | 3.99 ppt | None set | None | No health limit |
| Sodiumhighest measured · range 44.6 to 121 · printed as 121000 ppb · Wells · 2024 report, page 8 | 121 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.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Lockport’s water between Dec 2023 and Aug 2024. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFHxS9.2 pptFound in 2 of 14 samples · highest resultNo federal limit in force for this one
- PFBS3.2 pptFound in 1 of 14 samples · highest resultNo federal limit in force for this one
- Lithium65 ppbFound in 14 of 14 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: Copper, Lead
What removes it: Reverse osmosis or Certified carbon block or RO.
Radium and uranium
Found: Gross alpha (radioactivity), Radium (combined 226 + 228)
What removes it: Reverse osmosis.
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