Prince Frederick, MD – The Calvert County Department of Public Works, Water and Sewerage Division, reminds customers living in the Dowell community of the upcoming closure of the Dowell Post Office in January 2019. In order to ensure customers continue to receive communications regarding water and sewer service, contact Calvert County Water & Sewerage at waterandsewerage@calvertcountymd.gov or 410-535-1600, ext. 2329 to update your P.O. box number and/or mailing address.