If you have an MCL violation or potential MCL violation, do the following.
Call MassDEP during work hours: speak to a Drinking Water staff person as indicated below:
To report a Tier I violation or emergency after DEP work hours & holidays:
Call the DEP 24-hour emergency number: 888-304-1133
The emergency response person will refer your call to the drinking water person on call in your region.
Failure to monitor violations: check violation notice (NON) for PN requirements and/or consult with a Drinking Water staff person.