The occupant of every building or premises where garbage and refuse does or may exist shall provide containers made of substantial galvanized iron, plastic, rubber, or other nonrusting material in which shall be deposited all garbage and refuse existing at such building or premises. Each container shall be provided with handles or bails and with a tight fitting cover made of the same material as the container. All containers shall be watertight and they shall be of a size that can be conveniently handled by the collectors, and no container shall be more than 30 gallons in capacity nor measure over 22 inches in diameter or 30 inches in height. All containers shall be kept in a reasonably clean condition.