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PRETREATMENT. The process of reducing the amount of pollutants, eliminating pollutants, or altering the nature of pollutant properties in wastewater to a less harmful state prior to or in lieu of discharging or otherwise introducing the pollutants into the city's wastewater disposal system. The reduction, elimination or alteration may be obtained by physical, chemical or biological processes, process changes or other means, except by dilution. PUBLIC WORKS DIRECTOR. The Public Works Director or a deputy, agent or representative thereof. SANITARY SEWER. A sewer intended to carry only wastewater from general municipal users and industrial plants together with minor quantities of ground, storm and surface waters which are not admitted intentionally. SEWER SERVICE CHARGE. The aggregate of all the charges including the user charge, debt service charges and other sewer related charges that are billed periodically to users of the city facilities. STATE DISPOSAL SYSTEM (SDS) PERMIT. Any permit (including any terms, conditions and requirements thereof) issued by the MPCA pursuant to M.S. ~ 115.07 for a disposal system as defined by M.S. ~ 115.01, Subdivision 8. STORM SEWER OR STORM DRAIN. A drain or sewer intended to carry storm water, surface runoff, ground water, drainage and unpolluted water from any source. SUSPENDED SOLIDS (SS) OR TOTAL SUSPENDED SOLIDS (TSS). The total suspended matter that either floats on the surface of or is in suspension in water, wastewater or other liquids, and is removable by laboratory filtering as prescribed in "Standard Methods for the Examination of Water and Wastewater," latest edition, and referred to as non-filterable residue. USER. Any person who discharges or causes or permits the discharge of wastewater into the city's wastewater disposal system. USER CHARGE. A charge levied on users of city facilities for the cost of operation, maintenance and replacement of the facilities. WASTEWATER. The liquid and water-carried industrial or domestic wastes from dwellings, commercial buildings, industrial facilities, and institutions, together with any ground water, surface water and storm water that may be present, whether treated or untreated, which is discharged into or permitted to enter the city's wastewater disposal system. ( C) Wastewater discharge and use of sewers. (1) Wastewater discharge to natural outlet. It is unlawful to discharge to any natural outlet any wastewater or other polluted waters, except where suitable treatment has been provided in accordance with subsequent provisions of this section.