(a)  A licensed designer shall perform all studies, measurements, evaluations, investigations, data gathering, and other work within his or her licensed area of responsibility required to prepare the applicable submittal for individual sewage disposal systems. Nonlicensed employees or subordinates of a person possessing a designer’s license may assist in the work provided the work is done under the direct supervision of the licensed designer who shall be responsible for the work and shall sign any and all required applications, submittals, and certifications.

(b)  A licensed designer shall witness and inspect the installation of any individual sewage disposal system that he or she designed. The licensing authority may, in accordance with regulation, waive this requirement for good cause, including the designer’s death or incapacity.

(c)  A licensed designer shall certify to the licensing authority that the individual sewage disposal system was installed in conformance with the approved application, plans, specifications, applicable statutes and regulations, and that he or she has witnessed and inspected the installation. Upon the certification, the licensed designer shall be responsible for the installation. The certification shall not be construed to release the installer from liability. The licensed designer shall not be responsible for any negligent act or omission of a user of an ISDS, which causes damage to the ISDS, including altering of site conditions after certification of installation, failing to properly maintain the ISDS, or failing to protect the ISDS from physical disturbance causing damage.