The Pittsburgh Water and Sewer Authority [PWSA], plagued with an ongoing lead crisis, may finally have lead levels under control. New data, independently analyzed by PublicSource and verified by the state Department of Environmental Protection [DEP] on Wednesday, show that lead levels in Pittsburgh’s drinking water are going down, a sign that the authority’s efforts could be paying off. Lead test data collected from Pittsburgh homes between January and June show lead levels have fallen to 10 parts per billion [ppb], a significant drop from the last round of testing. Between July and December last year, the same tests produced lead levels of 21 ppb. While it’s not safe to consume any amount of lead, a known neurotoxin, the U.S. Environmental Protection Agency sets an “action limit” of 15 ppb, which the state DEP follows.