"Most of the problems are coming from ... old pipes that have been soldered together using lead solder," Newby said. "That doesn't happen anymore, but back in the day when those were all put together, that's how they were done. Usually we will replace the fixture. We know they're not systematic or piping issues throughout the buildings because you'd see them at multiple faucets at all of the buildings. We're not seeing that. We're seeing one or two here and there."