Section 28. Field of action authorized for Sanitary Engineering; prohibitions. —
It shall be unlawful for any person, unless exempted from registration under section twenty of this Act:
To be in responsible charge of the preparation of plans, designs, investigations, valuations, technical reports, specifications or estimates, or to be in performance of other sanitary engineering service, either for himself or for others, unless he holds a valid certificate of registration as sanitary engineer.
To be in responsible charge of the construction, erection, installation or alteration, or of the performance of sanitary engineering service in connection with the manufacture, sale, supply or distribution of any sanitary engineering works, projects or plant (as cited in article one, section two of this Act), either for himself or for others, unless he holds a valid certificate of registration as sanitary engineer.