Samples from five schools show elevated lead levels in drinking water, according to new results released by the San Diego Unified School District. However, the levels do not meet state requirements for action by the district. The results released on Thursday show several samples that are higher than the 5 parts per billion (ppb) used as a minimum for reporting by the City of San Diego Water Department. However, the levels did not reach the 15 ppb necessary to require action by the district under guidelines set in place by the California State Water Resources Control Board.