Lab samples taken over the summer revealed lead was in the Ridgewood Water supply, utility officials told the village council Wednesday.
According to Dave Scheibner, the utility's business director, regular tests required by the New Jersey DEP found "an exceedance" in June.
The discovery prompted a battery of public notices, including mailings to residents, healthcare and childcare facilities, as well as website posts.
"It's not a danger to the public," Scheibner said. "Essentially the lead that is detected is picked up in household plumbing, it’s not in the source water. The very simple method of dealing with it is if the water has been inactive for a while, run the faucet for half a minute and everything is gone."
Ridgewood Water services customers in Ridgewood, Glen Rock, Wyckoff and Midland Park.