Each service charge or rental levied pursuant to this chapter shall be collected by the Finance Director at the same time as bills for water service are collected, and the City Manager shall make and enforce such bylaws and regulations as may be deemed necessary for the safe, economical and efficient management and protection of the City sewage system and the sewage treatment and disposal works, for the construction and use of house sewers and connections to the sewage system and for the regulations, collection, rebating and refunding such charges and rentals.