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The water shortage has moved Saturday’s scheduled UNC-Notre Dame men’s basketball game to 1 p.m. Sunday at the Greensboro Coliseum. The game will not be televised. Chapel Hill and East Chapel Hill high schools postponed their Friday night basketball games, and Carrboro has moved Saturday’s wrestling championship match to Northwood High School in Pittsboro. Fluoride overfeed OWASA began getting its water from Durham when the fluoride overfeed forced it to shut down the Jones Ferry Road plant, its only drinking water plant. “We don’t know whether it was equipment error. We don’t know if it was human error or both,” Kerwin said. “That is certainly something we need to get to the bottom of.” The utility stressed the overfluoridated water was contained at the plant and did not go out to customers. Fluoride is added to water to prevent tooth decay. Though its use is controversial and some European countries do not add it to their water supplies, “the reality is fluoride is the 13th most common element in the earth’s crust,” said Dr. Tim Wright, chairman of the department of pediatric dentistry at the UNC School of Dentistry. “It’s a naturally occurring element” already present in water and many of the foods we eat, he said. Federal guidelines updated in 2011 recommend adding 0.7 parts per million of fluoride to water supplies to prevent dental caries, the process of demineralization of the teeth that can lead to cavities or holes in the teeth. This is the amount that OWASA normally adds, Wright said. The problem at the water treatment plant was adding up to 5 parts per million to the water. At 2 and 3 parts per million, chronic or long-term fluoride exposure can damage tooth formation prenatally and in children up to teenagers, Wright said. At 4 parts per million, fluoride has been associated with hip fractures in post- menopausal women, he said.