COUNCIL BLUFFS, Iowa (AP) — Council Bluffs officials have lifted a boil advisory after bacteria tests on the city’s water returned negative. Council Bluffs Water Works director Doug Drummey announced the lift at a news conference Thursday. He says the tests confirmed the water system was not compromised or contaminated. A water main break early Wednesday caused a drop in pressure. Officials worried it could have allowed contaminants to enter the lines, posing a danger to health. Schools, businesses and city residents took extra precautions during the advisory, including drinking bottled water and boiling water for a certain period of time.