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(1) reduces the amount of a hazardous substance, pollutant, or contaminant entering a wastesta'eam or released into the environment before recycling, treatment, or disposal; or (2) reduces a hazard to public health and the envirmm~ent associated with the release of hazardous substance, pollutants, or contaminant. Pre treatment or Treatment means the reduction of the amount of pollutants, the elimination of pollutants or the alteration of the natare of pollutant properties in wastewater to be a less harmful state prior to or in lieu of discharging or otherwise introducing pollutants into a POTW. The reduction or alteration can be obtained by physical, chemical or biological processes, process changes or by other means, except as prohibited by 40 CFR 403.6(d). Pretreatment requirements means any substantive or procedural requirement, other than a national pretreatment standard, imposed on an industrial user. Pretreatment standards also means the term National Pretreatment Standard or Standard means any regulation containing pollutant discharge limits promulgated by the EPA in accordance with section 307 (b) and (c) of the Act, which applies to industrial users. Prohibited waste means any waste which is totally restricted from discharge into the city sanitary sewer system by this division or the amount in the waste stream prior to pretreatment above the limits listed in this division. Publicly owned treatment works (POTW) means a treatment works, as defined by section 212 of the Act, which is owned in this instance by the city. This definition includes any devices and systems used in the storage, treatment, recycling and reclan~ation of municipal sewage or industrial wastes of a liquid nature. It also includes sewers, pipes, and other conveyances only if they convey wastewater to a POTW treatment plant. The term also means the municipality as defined in section 502 (4) of the Act, which has jurisdiction over the indirect discharges to and the discharges from such a treatment works. Receiving stream means the waterway into which a wastewater treatment plant, operated by the city, discharges the treated effluent. Sanitary convenience means any plumbing fixture, except for a food waste disposal unit, not required to have a sand and/or grease trap (interceptor) according to provisions of the plumbing code. Sanitary sewer means a pipe or conduit owned, coutrolled or snbject to the jurisdiction of the city, designed to collect and transport sewage and industrial waste. Sewage means waterborne waste normally discharging from the sanitary conveniences of dwellings, including apartment houses; hotels; office buildings; factories; and institutions that is free from storm emd surface water and industrial wastes. 8