San Diego school officials decided Tuesday to shut down any water source showing a lower level of lead in the water than first considered actionable when testing began in April. Water was at tested at 207 schools on district property. Results show 19 percent of the schools have some level of lead in the water. The San Diego Unified School District unanimously approved a water quality plan to lower the acceptable level of lead. Schools are required by the state to fix problems if they discover lead in water at levels greater than 15 parts per billion (ppb).