Pittsburgh’s water authority risked the health of residents in 161 households by not notifying them of lead service line replacements or conducting required sampling, Pennsylvania’s attorney general said in announcing criminal charges against the agency.

Pennsylvania Attorney General Josh Shapiro announced the charges against the Pittsburgh Water and Sewer Authority for 161 criminal counts of violating the state’s Safe Drinking Water Act.

“Our state law is very clear,” Shapiro said at a press conference Feb. 1. “If you fail to notify, if you fail to sample, you’re violating the statute.”

He said the charges resulted from a multitude...