It shall be the duty of the Plumbing Inspector to:
(A) Inspect the system of drainage, sewerage and plumbing in any building in the city, when called upon to do so by the owner.
(B) Inspect any building if called upon by the tenant or adjoining owner, or if directed to do so by the City Manger.
(C) Make at least two inspections of all work in process of construction, and give a certificate of inspection when the installation is found to be in accordance with the Building Code.
(D) Not be interested, either directly or indirectly in the plumbing business or receive any fees or commissions, other than allowed by the City Council.