All permits secured for the doing of any plumbing, house drainage, cesspools, water piping, and fixtures attached thereto, directly or indirectly connected to the city service water supply, cesspools, wastes, traps or vents, shall be conspicuously posted upon the front of the premises where the work is being done. Any police official or inspector of the Department of Health of the said cities shall immediately order such work discontinued until a permit is produced: Provided, That if said work be nevertheless continued without placing said permit in a conspicuous place, said person or persons shall be guilty of a violation, and punished as set forth herein.