Unless allowed by a service contract or wastewater discharge permit, it shall be unlawful to permit or cause flow of any matter, substances, or liquid deleterious to the sanitary sewer or which shall endanger the employees, operation, or treatment processes of wastewater disposal, or which shall cause encrustation or otherwise chemically or physically corrode or erode the sewer system and wastewater treatment facilities. In no case shall wastewater with a pH lower than 6.0 be discharged to the sanitary sewer. (Ord. 2836 § 1, 2008)