It shall be unlawful for any person to interfere with, molest or destroy the waterworks, reservoir, pipes, branches, fittings, faucets, fire plugs, hydrants or any part thereof or any property or building belonging or appertaining thereto. Any person having the authority to use or open the fire plugs for any other purpose other than in case of fire shall do so under the supervision of the City plumbers or some other person authorized by law to open or use the plugs; and it shall be the duty of all officers of Council or the members thereof or their authorized agents to apprehend every offender or trespasser on the works or property and take him before the Mayor to answer for such offense. Any person using the fire plugs, hose or other such material shall pay the Water and Sewer Department for the use thereof and other expenses attending such use, and shall also be liable for any damage done thereto.