(a) Individual onsite wastewater treatment systems shall be designed and constructed in accordance with the standards of the State Commissioner of Health as set forth in Appendix 75-A of this Title.

(b) Plans for the design of individual onsite wastewater treatment systems shall be prepared directly by or under the supervision of a design professional.

(c) Prior to construction of an individual onsite wastewater treatment system utilizing an alternative system pursuant to Appendix 75-A of this Title, plans for the design of the system shall be reviewed and approved by the State or county health department official having jurisdiction. A design professional shall supervise the construction of the alternative system and ensure that such construction conforms to the approved plans. After construction is completed, a design professional shall provide the State or county health department official having jurisdiction with a certification that the construction of the alternative system was supervised by a design professional and that such construction conforms to the approved plans.