What was found in Joliet's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Copper | 10100 µg/L 777% of the EPA limit, in the worst sample — 1300 µg/L | 11/13 | SYR4 |
| Nitrate | 2780 µg/L 28% of the EPA limit 10000 µg/L | 6/13 | SYR4 |
| Nitrate-Nitrite | 2780 µg/L 28% of the EPA limit 10000 µg/L | 4/13 | SYR4 |
| Fluoride | 2290 µg/L 57% of the EPA limit 4000 µg/L | 7/13 | SYR4 |
| Lead | 459 µg/L 3060% of the EPA limit, in the worst sample — 15 µg/L | 11/13 | SYR4 |
| Barium | 190 µg/L 9.5% of the EPA limit 2000 µg/L | 7/13 | SYR4 |
| TTHM | 94 µg/L 118% of the EPA limit, in the worst sample — 80 µg/L | 10/13 | SYR4 |
| Total Haloacetic Acids (HAA5) | 68.3 µg/L 114% of the EPA limit, in the worst sample — 60 µg/L | 10/13 | SYR4 |
| Chloroform | 63.17 µg/L No EPA limit set | 9/13 | SYR4 |
| Lithium | 54.7 µg/L No EPA limit set | 2/13 | UCMR-5 |
| Nitrite | 50 µg/L 5% of the EPA limit 1000 µg/L | 1/13 | SYR4 |
| Dichloroacetic Acid | 40.4 µg/L No EPA limit set | 3/13 | SYR4 |
| Gross Alpha, Excl. Radon And U | 21.29 pCi/L 142% of the EPA limit, in the worst sample — 15 pCi/L | 1/13 | SYR4 |
| Bromodichloromethane | 20.6 µg/L No EPA limit set | 9/13 | SYR4 |
| Trichloroacetic Acid | 16.7 µg/L No EPA limit set | 4/13 | SYR4 |
| Dibromochloromethane | 16 µg/L No EPA limit set | 8/13 | SYR4 |
| Chromium | 12 µg/L 12% of the EPA limit 100 µg/L | 2/13 | SYR4 |
| Monochloroacetic Acid | 11.4 µg/L No EPA limit set | 2/13 | SYR4 |
| Combined Radium (-226 And -228) | 6.9 pCi/L 138% of the EPA limit, in the worst sample — 5 pCi/L | 7/13 | SYR4 |
| Bromoform | 4.8 µg/L No EPA limit set | 7/13 | SYR4 |
| Dibromoacetic Acid | 4.7 µg/L No EPA limit set | 10/13 | SYR4 |
| Dichloromethane | 3.67 µg/L 73% of the EPA limit 5 µg/L | 1/13 | SYR4 |
| Arsenic | 3.4 µg/L 34% of the EPA limit 10 µg/L | 6/13 | SYR4 |
| Selenium | 3.33 µg/L 6.7% of the EPA limit 50 µg/L | 4/13 | SYR4 |
| Monobromoacetic Acid | 2.05 µg/L No EPA limit set | 2/13 | SYR4 |
| Xylenes, Total | 1.81 µg/L 0% of the EPA limit 10000 µg/L | 1/13 | SYR4 |
| Combined Uranium | 0.5215 µg/L 1.7% of the EPA limit 30 µg/L | 1/13 | SYR4 |
| Lead | 0.0065 mg/L 43% of the EPA limit 0.0150 mg/L | 12/13 | LCR |
| Pfpea | 0.0032 µg/L No EPA limit set | 1/13 | UCMR-5 |
Water suppliers serving Joliet
| Supplier | Population served |
|---|---|
| JOLIET | 160,000 |
| SOUTHEAST JOLIET SD | 2,000 |
| CRYSTAL LAWNS ADDITION IMPROVEMENT ASSOC | 1,435 |
| STATEVILLE CORRECTIONAL CENTER | 992 |
| LAKEWOOD SHORES IMPROVEMENT ASSOCIATION | 868 |
| INGALLS PARK SUBDIVISION | 744 |
| JOLIET INPATIENT TREATMENT CENTER | 486 |
| AQUA ILLINOIS-OAKVIEW | 312 |
| SUNNYLAND SUBDIVISION | 300 |
| JOLIET TREATMENT CENTER | 217 |
| SOUTH RIDGE MHC | 96 |
| CRISWELL COURT MHP | 94 |
| GARDEN STREET IMPROVEMENT ASSOCIATION | 54 |
Frequently asked questions about Joliet tap water
Is Joliet tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Joliet. 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 Joliet?
13 public water suppliers report drinking-water monitoring for Joliet, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Joliet's water?
The contaminants EPA monitoring detected in Joliet include Copper, Nitrate, Nitrate-Nitrite, Fluoride, Lead. The full list, with the highest level found 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.