Mass. Gen. Laws ch. 21, § 45

Any proposal to suspend or revoke a permit, in whole or in part, under paragraph (10) of section forty-three, including any proposed reduction in an authorized discharge, and any cease and desist order under paragraph (1) of section forty-four, shall inform the person to whom it is issued of his right to request, within thirty days, a hearing under the provisions of chapter thirty A. If he fails to make such a request, he shall be deemed to have consented to the order. If a timely request is submitted, the director shall within a reasonable time hold a hearing under the provisions of chapter thirty A.