Maryland Statutes
Part IV - Discharge Permits
Section 9-331 - Records and Reports

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.