What was found in Lockport's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 1740 µg/L 17% of the EPA limit 10000 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 2/4 | SYR4 |
| Fluoride | 1011 µg/L 25% of the EPA limit 4000 µg/L Main supplier: LOCKPORT · 23,100 people · 2019
Highest in the city: 1155 µg/L — COLLEGE VIEW SUBDIVISION · 570 people · 2018 | 2/4 | SYR4 |
| Nitrate-Nitrite | 1072.45 µg/L 11% of the EPA limit 10000 µg/L Main supplier: LOCKPORT · 23,100 people · 2016 | 2/4 | SYR4 |
| Copper | 795.8 µg/L 61% of the EPA limit 1300 µg/L Main supplier: LOCKPORT · 23,100 people · 2017 | 2/4 | SYR4 |
| Lithium | 65 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2024 | 1/4 | UCMR-5 |
| Barium | 49.89 µg/L 2.5% of the EPA limit 2000 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 2/4 | SYR4 |
| TTHM | 31.98 µg/L 40% of the EPA limit 80 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 4/4 | SYR4 |
| Lead | 23.775 µg/L 159% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: LOCKPORT · 23,100 people · 2017 | 2/4 | SYR4 |
| Chromium | 20.921 µg/L 21% of the EPA limit 100 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 1/4 | SYR4 |
| Chloroform | 13.675 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 10.746 µg/L 18% of the EPA limit 60 µg/L Main supplier: LOCKPORT · 23,100 people · 2019
Highest in the city: 13.128 µg/L — BONNIE BRAE FOREST MANOR SNDST · 1,338 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 11 µg/L No EPA limit set Highest in the city: BONNIE BRAE FOREST MANOR SNDST · 1,338 people · 2019 | 1/4 | SYR4 |
| Bromodichloromethane | 10.365 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019 | 4/4 | SYR4 |
| Arsenic | 7.827 µg/L 78% of the EPA limit 10 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 6.844 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 5.378 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019 | 3/4 | SYR4 |
| Bromoform | 1.4675 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019
Highest in the city: 4.54485 µg/L — COLLEGE VIEW SUBDIVISION · 570 people · 2019 | 3/4 | SYR4 |
| Trichloroacetic Acid | 4.089 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 1.81 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019
Highest in the city: 3.2015 µg/L — COLLEGE VIEW SUBDIVISION · 570 people · 2019 | 4/4 | SYR4 |
| Combined Radium (-226 And -228) | 2.885 pCi/L 58% of the EPA limit 5 pCi/L Main supplier: LOCKPORT · 23,100 people · 2019 | 2/4 | SYR4 |
| Selenium | 2.508 µg/L 5% of the EPA limit 50 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 2/4 | SYR4 |
| Monobromoacetic Acid | 2.053 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2019 | 2/4 | SYR4 |
| Xylenes, Total | 0.9000 µg/L 0% of the EPA limit 10000 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 1/4 | SYR4 |
| Toluene | 0.6600 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: LOCKPORT · 23,100 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0300 mg/L 200% above the EPA limit of 0.0150 mg/L Main supplier: LOCKPORT · 23,100 people · 2025 | 4/4 | LCR |
| PFHXS | 0.0092 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2024 | 1/4 | UCMR-5 |
| Pfpea | 0.0082 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2024 | 1/4 | UCMR-5 |
| Pfhxa | 0.0043 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2024 | 1/4 | UCMR-5 |
| PFBS | 0.0032 µg/L No EPA limit set Main supplier: LOCKPORT · 23,100 people · 2024 | 1/4 | UCMR-5 |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Lockport
| Supplier | Population served |
|---|---|
| LOCKPORT | 23,100 |
| BONNIE BRAE FOREST MANOR SNDST | 1,338 |
| LOCKPORT HEIGHTS SD | 984 |
| COLLEGE VIEW SUBDIVISION | 570 |
Frequently asked questions about Lockport tap water
Is Lockport tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Lockport. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Lockport?
4 public water suppliers report drinking-water monitoring for Lockport, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Lockport's water?
The contaminants EPA monitoring detected in Lockport include Nitrate, Fluoride, Nitrate-Nitrite, Copper, Lithium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.