(a) Any user of the service of the sewer system shall pay a monthly charge or rate as set forth in appendix B to this code. The schedule of fees is subject to revision as may be necessary to keep rates commensurate with the changes in the cost of providing service and is otherwise subject to revision due to any regulatory or environmental factors which increase the cost of sewage treatment. All revisions shall be done by resolution and shall become effective as of January 1 of each year. The city council may utilize, as a basis of any rate increase, a sewer rate study to be conducted, at a minimum, every five years.

(b) It is the intent of this section that all condominiums or other developments, particularly developments with a mixture of housing types, be charged a sewer rate in accordance with the type of structure actually built.