Section 691.207 - Approval of plans, designs, and relevant data by the department(a) All plans, designs, and relevant data for the construction of any new sewer system, or for the extension of any existing sewer system, except as provided in section (b), by a person or municipality, or for the erection, construction, and location of any treatment works or intercepting sewers by a person or municipality, shall be submitted to the department for its approval before the same are constructed or erected or acquired. Any such construction or erection which has not been approved by the department by written permit, or any treatment works not operated or maintained in accordance with the rules and regulations of the department, is hereby also declared to be a nuisance and abatable as herein provided.(b) Except as specifically provided by the rules and regulations of the department, plans, designs and relevant data for the construction of a sewer extension to collect no more than the volume of sewage from two hundred fifty single-family dwelling units or their equivalent by a person or municipality shall not require a permit from the department if such sewer extension is located, constructed, connected and maintained in accordance with the rules and regulations of the department and is consistent with the approved official plan, required by section 5 of the act of January 24, 1966 (1965 P.L. 1535, No. 537), known as the "Pennsylvania Sewage Facilities Act," for the municipality in which the sewer extension is to be located, constructed, connected or maintained. However, all such sewer extensions remain subject to any conditions imposed by the department, the municipality or any municipal authority whose interest may be affected by the sewer extension. Any such sewer extension which is located, constructed, connected or maintained contrary to the rules and regulations of the department, contrary to the terms and conditions of a permit, inconsistent with the approved official plan for the municipality or contrary to any conditions imposed by the department, municipality or municipal authority is also hereby declared to be a nuisance and abatable as provided herein.1937, June 22, P.L. 1987, art. II, § 207. Amended 1980, Oct. 10, P.L. 894, No. 157, § 1, imd. effective; 1989 , July 7, P.L. 237, No. 40, § 2, effective in 60 days.