By rule, regulation, order, permit, or otherwise, the Department may require the owner or operator of any source of a discharge of pollutants or of any source that is an industrial user of a publicly owned treatment works: (1) To keep records; (2) To make reports; (3) To install, calibrate, use, and maintain monitoring equipment or methods, including, where appropriate, biological monitoring methods; (4) To sample discharges in accordance with the methods, at the locations, at the intervals, and in the manner the Department requires; and (5) To provide to the Department any information that the Department reasonably requires about: (i) Discharge of pollutants into the waters of this State; or (ii) Introduction of pollutants into publicly owned treatment works.
Maryland Legal Code