If your facility discharges 10,000* gallons per day or more of sanitary wastewater or any amount of industrial wastewater to the ground, you have to file for a groundwater discharge permit.
Groundwater discharge permits are issued primarily for domestic and commercial wastewater, carwashes, laundromats and certain industrial facilities. For more detail on different types of groundwater discharges, see the Ground Water Discharge Program regulations at 314 CMR 5.03 & 5.04.
Certain discharges are exempt from permitting by the Groundwater Discharge Program, including facilities that are regulated under Title 5. See 314 CMR 5.05 for a complete list of exempt discharges.
* There may be instances, particularly in nitrogen sensitive areas, where a groundwater discharge permit will be required for flows less than 10,000 gpd.