A San Diego elementary school is shutting off part of their drinking water supply due to unsafe lead levels, district officials announced Friday. Six water fixtures at Fletcher Elementary School, a K-5 school on Bobolink Way in the Linda Vista area, displayed higher lead levels than the district’s 5ppb safety limit during testing at the school. Most of the fixtures had lead levels under 10 parts per billion, but one — a cafeteria kitchen faucet — showed levels of about 45 parts per billion, nine times higher than the district’s limit and three times higher than the federal limit of 15 parts per billion.