Water & Sewer Commission From thomson-mcduffie.com The McDuffie County-City of Thomson Water & Sewer Commission establishes policy and guides the continued development of a county-wide, water-and-sewer system. The City of Thomson is responsible for the day-to-day operation of the system. To connect to the system or for more information, visit City Hall at 309 Main Street in Thomson, Ga., or call (706) 595-1781. ©2007 Thomson-McDuffie County