The Washington Suburban Sanitary Commission (WSSC) is a public utility that provides water and wastewater services to Montgomery and Prince George's counties in Maryland. The commission was established in 1918 and is headquartered in Laurel, Maryland. WSSC operates two water treatment plants and two wastewater treatment plants, as well as a network of pipes and pumping stations. The commission serves over 1.8 million people in the Washington, D.C. metropolitan area.