HAVRE DE GRACE WATER PLANT TO HOLD OPEN TOURS SATURDAY, APRIL 22 AND SATURDAY, APRIL 29, 2017. Havre de GraceHAVRE DE GRACE WATER PLANT TO HOLD OPEN TOURS SATURDAY, APRIL 22 AND SATURDAY, APRIL 29, 2017. FOR IMMEDIATE RELEASE April 4, 2017 PDF Download Media Download HAVRE DE GRACE WATER PLANT TO HOLD OPEN TOURS SATURDAY, APRIL 22 AND SATURDAY, APRIL 29, 2017. The Mayor would like to invite all citizens to tour the Havre de Grace Water Plant located at 415 St. John Street. The facility will be open for public tours Saturday, April 22 and Saturday, April 29, 2017 from 10 a.m until 2 p.m. The public will have the opportunity to see first-hand the process of making clean drinking water from the Susquehanna River.