City’s Utilities Open House Day Havre de GraceCity’s Utilities Open House Day City’s Utilities Open House Day Saturday, December 14, 2019 10:00 A.M. – 4:00 P.M. The City of Havre de Grace will be hosting an open house and tours of its Water Treatment Plant located at 415 Saint John Street and the Wastewater Treatment Plant located at 1 Jerry Foster Way. -The Havre de Grace Water Treatment Plant is responsible for providing citizens with safe and reliable drinking water. -The Wastewater Treatment Plant is responsible for treating wastewater before it’s returned to the waterway.