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 |
|---|---|---|---|
| MCL | Health-based | Resolved | 1984-01-25 → 1988-01-24 |
| MCL | Health-based | Resolved | 1984-01-25 → 1988-01-24 |
| MCL | Health-based | Resolved | 1984-01-25 → 1988-01-24 |
| MCL | Health-based | Resolved | 1984-01-25 → 1988-01-24 |
| MCL | Health-based | Resolved | 1984-01-25 → 1988-01-24 |
| MCL | Health-based | Resolved | 1984-01-25 → 1988-01-24 |
| MCL | Health-based | Resolved | 1984-01-25 → 1988-01-24 |
| Other | Monitoring | Unaddressed | 2026-01-14 |
| Other | Monitoring | Unaddressed | 2026-01-14 |
| Other | Monitoring | Unaddressed | 2025-07-01 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Bromodichloromethane | 12.9 µg/L No EPA limit set
worst single sample: 14.6 µg/L | 183/183 | SYR4 | 2012–2019 |
| Chloroform | 29.592 µg/L No EPA limit set
worst single sample: 38.3 µg/L | 183/183 | SYR4 | 2012–2019 |
| Dibromochloromethane | 6.655 µg/L No EPA limit set
worst single sample: 8.35 µg/L | 183/183 | SYR4 | 2012–2019 |
| TTHM | 48.7 µg/L 61% of the EPA limit 80 µg/L
worst single sample: 59.1 µg/L | 183/183 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 29.475 µg/L 49% of the EPA limit 60 µg/L
worst single sample: 72.9 µg/L | 178/183 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 10.635 µg/L No EPA limit set
worst single sample: 20.7 µg/L | 174/183 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 14.45 µg/L No EPA limit set
worst single sample: 33 µg/L | 146/183 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.684 µg/L No EPA limit set
worst single sample: 2.9 µg/L | 125/183 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 24.07 µg/L No EPA limit set
worst single sample: 62.7 µg/L | 55/183 | SYR4 | 2012–2019 |
| Copper | 172.5 µg/L 13% of the EPA limit 1300 µg/L
worst single sample: 229 µg/L | 31/60 | SYR4 | 2014–2017 |
| Monochloroacetic Acid | 8.48 µg/L No EPA limit set
worst single sample: 13.4 µg/L | 25/183 | SYR4 | 2012–2019 |
| Lead | 0.0088 mg/L 59% of the EPA limit 0.0150 mg/L | 19/19 | LCR | 2025 |
| Lead | 9.41 µg/L 63% of the EPA limit 15 µg/L
worst single sample: 12.4 µg/L | 14/60 | SYR4 | 2014–2017 |
| Bromoform | 1.5222 µg/L No EPA limit set
worst single sample: 1.587 µg/L | 13/183 | SYR4 | 2012–2019 |
30 contaminants tested, none detected
Utility contact
Frequently asked questions about Arlington Heights
Is Arlington Heights tap water safe to drink?
EPA monitoring detected 14 contaminants in Arlington Heights'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 Arlington Heights'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 Arlington Heights serve?
Arlington Heights reports serving 73,320 people in Illinois, per its EPA record.
Has Arlington Heights had any water quality violations?
The EPA has 77 violations on file for Arlington Heights, of which 7 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.