San Diego’s Public Utilities Department is responding quickly to recent reports on the possibility of the city’s water lines being made out of lead. Last week, as reported by NBC 7, San Diego’s Water Department had informed California’s Water Board that it couldn’t identify the materials used to make two-thirds of its service lines. The city’s disclosure differed from statements it had made to NBC 7 and media partner Voice of San Diego last year. At that time, a senior water department chemist said there were no lead pipes in the city’s distribution system.