The Iowa Department of Natural Resources Saturday afternoon, lifted a water boil advisory for the northern half of Adel. Two separate water samples of the system indicate the water is now safe to drink from the tap. The boil advisory was issued on Thursday for the portion of the city north of Green Street, also known as old Highway 6, after a water main broke. The repair on the water main was completed by early Thursday evening, but since water pressure was lost during the break and repair, the boil advisory was issued until sampling could take place to ensure safety.