San Diego Unified School District will test every drinking fountain and kitchen sink on campuses for lead in the water over the next few years, greatly expanding on tests previously conducted by the City of San Diego. School district trustees adopted the testing plan, expected to cost $200,000, at Tuesday night’s meeting. Fixing all the faucets and sinks that are found to have a certain level of lead could cost more than $1 million over the next three to five years.