Section 33D. In order to prevent or reduce discharges to the waters of the commonwealth or to implement comprehensive basin or regional plans approved by the division of water pollution control, the director of the division may order the appropriate municipalities, districts and other competent public entities to construct the necessary facilities for which financial assistance has been authorized under chapter twenty-nine C or for which construction grants are authorized under section thirty-three or section thirty-three E in accordance with timetables for compliance specified in the orders.