Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
| Violation | Type | Status | Period |
|---|---|---|---|
| RPT | Monitoring | Unaddressed | 2025-07-02 |
| RPT | Monitoring | Unaddressed | 2025-07-02 |
| Other | Monitoring | Unaddressed | 2025-07-01 |
| MR | Monitoring | Resolved | 2020-12-30 |
| MR | Monitoring | Resolved | 2020-12-30 |
| Other | Monitoring | Resolved | 2019-07-01 |
| Other | Monitoring | Resolved | 2019-07-01 |
| Other | Monitoring | Resolved | 2016-07-01 |
| Other | Monitoring | Resolved | 2016-07-01 |
| Other | Monitoring | Resolved | 2009-07-01 |
PFAS detected
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| Pfba | 0.0093 µg/L | 1/4 | 2024 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 15.86 µg/L No EPA limit set
worst single sample: 16.9 µg/L | 103/103 | SYR4 | 2012–2019 |
| Chloroform | 37.58 µg/L No EPA limit set
worst single sample: 43.8 µg/L | 103/103 | SYR4 | 2012–2019 |
| Dibromochloromethane | 7.651 µg/L No EPA limit set
worst single sample: 8.45 µg/L | 103/103 | SYR4 | 2012–2019 |
| TTHM | 61.42 µg/L 77% of the EPA limit 80 µg/L
worst single sample: 69.2 µg/L | 103/103 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 22.28 µg/L 37% of the EPA limit 60 µg/L
worst single sample: 28.7 µg/L | 102/103 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 10.295 µg/L No EPA limit set
worst single sample: 13.1 µg/L | 102/103 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 13.195 µg/L No EPA limit set
worst single sample: 17.5 µg/L | 68/103 | SYR4 | 2012–2019 |
| Copper | 156 µg/L 12% of the EPA limit 1300 µg/L
worst single sample: 500 µg/L | 58/60 | SYR4 | 2014–2017 |
| Dibromoacetic Acid | 1.8 µg/L No EPA limit set
worst single sample: 2 µg/L | 57/103 | SYR4 | 2012–2019 |
| Bromoform | 2.163 µg/L No EPA limit set
worst single sample: 3.45 µg/L | 23/103 | SYR4 | 2012–2019 |
| Lead | 14.2 µg/L 95% of the EPA limit 15 µg/L
worst single sample: 18 µg/L | 20/60 | SYR4 | 2014–2017 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 16/16 | LCR | 2025 |
| Monobromoacetic Acid | 2.6575 µg/L No EPA limit set
worst single sample: 2.73 µg/L | 6/103 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 8.9475 µg/L No EPA limit set
worst single sample: 8.98 µg/L | 2/103 | SYR4 | 2012–2019 |
29 contaminants tested, none detected
Utility contact
Frequently asked questions about Oak Forest
Is Oak Forest tap water safe to drink?
EPA monitoring detected 15 contaminants in Oak Forest's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Oak Forest's water?
EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.
How many people does Oak Forest serve?
Oak Forest reports serving 27,478 people in Illinois, per its EPA record.
Has Oak Forest had any water quality violations?
The EPA has 16 violations on file for Oak Forest, of which 0 are health-based (a contaminant limit or required treatment was breached) and 3 remain open. The rest are monitoring or reporting failures.
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.