To address these discharges, MA Drinking Water Regulations require a local prohibition on existing floor drain discharges in Zone II of public drinking water wells. Specifically, MA Wellhead Protection Regulation 310 CMR 22.21(2)(a)(8) prohibits: any floor drainage systems in existing facilities, in industrial or commercial hazardous material and/or hazardous waste process areas or storage areas, which discharge to the ground without a MassDEP permit or authorization. Existing facilities with such a drainage system shall be required to either seal the floor drain (in accordance with the state plumbing code, 248 CMR 10.00), connect the drain to a municipal sewer system (with all appropriate permits and pre-treatment), or connect the drain to a holding tank meeting the requirements of all appropriate MassDEP regulations and policies.
Commercial and industrial floor drains discharging directly to the ground or via septic systems, cesspools, leaching fields or dry wells, pose a serious threat to public drinking water quality. In Massachusetts, floor drain discharges have caused groundwater and soil contamination, resulting in lengthy and costly remediation.