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Spokesperson Darryl Matson says one of the facility hit has been an sewage treatment plant located in the Intercity area.
All city residents are being told not to flush toilets, run baths or wash closes.
States of Emergency have also been declared in rural areas of Oliver-Paipoonge and Conmee where several roads have been washed out.
Highway 11-17 from the corner of Highway 102 though Kakabeka Falls to the city is also closed