1. Engineering and administrative expense for sewer extensions and laterals shall be apportioned against the adjoining property, area or districts served.

2. The county commission may make general regulations concerning the right to make house or building connections with any of said sewers and shall require that a permit must be obtained from the sewer engineer before such connection shall be allowed and also that all costs of making such connection shall be paid by the person requesting such permit. The county commission, by resolution, may delegate full authority to the sewer engineer to regulate the connections of any sewer herein provided for and to regulate the kind of sewage which may be discharged therein.

3. The sewer engineer may be authorized by the county commission to make a contract or contracts with any municipal corporation to allow such municipal corporation to discharge sewage in any part of the sewerage system, which is maintained under the provisions of sections 249.430 to 249.660, for such compensation and upon such reasonable terms as may be agreed upon between such municipal corporation and such sewer engineer, all subject to the approval of the county commission. The sewer engineer, by and with the approval of the county commission, shall also have power and authority to adopt, formulate and promulgate a code or set of rules and regulations pertaining to and respecting any and all specifications, plumbing installations and repair work on any fixtures or appurtenances located on any premises included in or embraced by any district or districts set up, as provided for in sections 249.430 to 249.660.