What was found in Granite City'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 | 4980 µg/L 50% of the EPA limit 10000 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 1/2 | SYR4 |
| Fluoride | 1026 µg/L 26% of the EPA limit 4000 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 1/2 | SYR4 |
| Copper | 123 µg/L 9.5% of the EPA limit 1300 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2017
Highest in the city: 185.5 µg/L — MITCHELL PWD · 5,253 people · 2017 | 2/2 | SYR4 |
| TTHM | 67.225 µg/L 84% of the EPA limit 80 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019
Highest in the city: 67.69 µg/L — MITCHELL PWD · 5,253 people · 2019 | 2/2 | SYR4 |
| Chloroform | 56.555 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 33.065 µg/L 55% of the EPA limit 60 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019
Highest in the city: 33.37 µg/L — MITCHELL PWD · 5,253 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 20.665 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 13.965 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 2/2 | SYR4 |
| Lithium | 13.4 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2024 | 1/2 | UCMR-5 |
| Bromodichloromethane | 11 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019
Highest in the city: 11.2 µg/L — MITCHELL PWD · 5,253 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 2.8 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019
Highest in the city: 9.28 µg/L — MITCHELL PWD · 5,253 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 4.8 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019
Highest in the city: 5.235 µg/L — MITCHELL PWD · 5,253 people · 2019 | 2/2 | SYR4 |
| Lead | 5 µg/L 33% of the EPA limit 15 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2017 | 1/2 | SYR4 |
| Dibromochloromethane | 2.94 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 2.16 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019
Highest in the city: 2.635 µg/L — MITCHELL PWD · 5,253 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.5000 µg/L 10% of the EPA limit 5 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.4900 µg/L 16% of the EPA limit 3 µg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2019 | 1/2 | SYR4 |
| PFBS | 0.0210 µg/L No EPA limit set Highest in the city: MITCHELL PWD · 5,253 people · 2023 | 1/2 | UCMR-5 |
| Pfba | 0.0174 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2024 | 2/2 | UCMR-5 |
| Lead | 0.0060 mg/L 40% of the EPA limit 0.0150 mg/L Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2025 | 2/2 | LCR |
| Pfpea | 0.0042 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2024
Highest in the city: 0.0045 µg/L — MITCHELL PWD · 5,253 people · 2023 | 2/2 | UCMR-5 |
| Pfhxa | 0.0040 µg/L No EPA limit set Main supplier: IL AMERICAN-GRANITE CITY · 33,572 people · 2024
Highest in the city: 0.0043 µg/L — MITCHELL PWD · 5,253 people · 2023 | 2/2 | 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 Granite City
| Supplier | Population served |
|---|---|
| IL AMERICAN-GRANITE CITY | 33,572 |
| MITCHELL PWD | 5,253 |
Frequently asked questions about Granite City tap water
Is Granite City tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Granite City. 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 Granite City?
2 public water suppliers report drinking-water monitoring for Granite City, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Granite City's water?
The contaminants EPA monitoring detected in Granite City include Nitrate, Fluoride, Copper, TTHM, Chloroform. 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.