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Waste Tra and Se arators. Oil, grease, and sand waste traps and separators shall be installed for the proper discharge of waste water containing excessive arnounts of oil; grease, sand, or flammable liquids when required by the Minnesota Plumbing Code, Minnesota Rules, Chapter:47.15, the Regional Administrator of the Metropolitan Council, or when the city determines such traps. or separators are. necessary. Waste. traps and separators shall be maintained in efficient operating conditions by the owner and at the owner's expense, through the periodic removal of any accumulated residue. if a trap or separator is not properly maintained, the city may. have tile. system, including affected city sewers, cleaned. at the owner's expense: Ta inp erin g With. Municip ail Sewer Sys tern Prohibited. No.. person shall maliciously, willfully; or negligently damage, destroy, uncover; deface; or tamper with any part of the Municipal Sewer System, Cross -Connection Control, Cross -connection between the municipal water system and other systems, private wells, or equipment containing water or other substances of unknown or questionable safety are prohibited, except when and where, as approved by the. City, suitable. backflow prevention. devices. are installed, tested, and maintained to ensure proper operation on a continuing basis as per the following requirements:. (A) A backflow prevention.. device is to be awned; tested, and maintained by the custornerlawrier of the. premises being served. (B) Installation, maintenance, and testing of backflow preventers shall be according to. the State of Minnesota Plumbing Code. (1) It is required that reduced pressure zone backflow preventers be tested annually and overhauled "at intervals not to excecd five years: Testing shall be performed by a qualified backflow tester... A licensed plumber qualified in backflow testing shall perform all internal maintenance to. the. device.. Test results. shall be furnished to the: City.. (2) A person who is.recognized by the Minnesota Department. of Health as a backflow preventer tester is considered.by the City to test. backflow presenters and certify tliern to be functional, (C) Failure to comply with the provisions of this section shall be cause to discontinue water service.