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 | 2006-01-01 → 2006-03-31 |
| MCL | Health-based | Resolved | 2006-01-01 → 2006-03-31 |
| MCL | Health-based | Resolved | 2006-01-01 → 2006-03-31 |
| MCL | Health-based | Resolved | 2005-10-01 → 2005-12-31 |
| MCL | Health-based | Resolved | 2005-10-01 → 2005-12-31 |
| MCL | Health-based | Resolved | 2005-10-01 → 2005-12-31 |
| MCL | Health-based | Resolved | 2005-01-01 → 2005-03-31 |
| MCL | Health-based | Resolved | 2005-01-01 → 2005-03-31 |
| MCL | Health-based | Resolved | 2005-01-01 → 2005-03-31 |
| MCL | Health-based | Resolved | 2004-10-01 → 2004-12-31 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 156 µg/L 12% of the EPA limit 1300 µg/L
worst single sample: 192 µg/L | 49/50 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 30/30 | LCR | 2025 |
| Bromodichloromethane | 17 µg/L No EPA limit set
worst single sample: 18 µg/L | 21/21 | SYR4 | 2012–2019 |
| Chloroform | 66 µg/L No EPA limit set
worst single sample: 86.8 µg/L | 21/21 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 24 µg/L No EPA limit set
worst single sample: 35 µg/L | 21/21 | SYR4 | 2012–2019 |
| TTHM | 87.1 µg/L 109% of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 102.7 µg/L | 21/21 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 51 µg/L 85% of the EPA limit 60 µg/L
worst single sample: 84 µg/L | 21/21 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 42 µg/L No EPA limit set
worst single sample: 46 µg/L | 21/21 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.12 µg/L No EPA limit set
worst single sample: 3.3 µg/L | 19/21 | SYR4 | 2012–2019 |
| Lead | 16.375 µg/L 109% of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 22.5 µg/L | 8/50 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 6.085 µg/L No EPA limit set
worst single sample: 7 µg/L | 4/21 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.2 µg/L No EPA limit set | 1/21 | SYR4 | 2012–2019 |
2 contaminants tested, none detected
Utility contact
Frequently asked questions about Ctwc - Shoreline Region-Masons Island
Is Ctwc - Shoreline Region-Masons Island tap water safe to drink?
EPA monitoring detected 12 contaminants in Ctwc - Shoreline Region-Masons Island'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 Ctwc - Shoreline Region-Masons Island's water?
EPA monitoring detected Copper, Lead, Bromodichloromethane, Chloroform, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.
How many people does Ctwc - Shoreline Region-Masons Island serve?
Ctwc - Shoreline Region-Masons Island reports serving 445 people in Connecticut, per its EPA record.
Has Ctwc - Shoreline Region-Masons Island had any water quality violations?
The EPA has 33 violations on file for Ctwc - Shoreline Region-Masons Island, of which 12 are health-based (a contaminant limit or required treatment was breached) and 0 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.