Potomac Disposal Services -PDS is northern Virginia??s largest commercial waste collection and roll-off service company, and the second-largest collection service in the entire metropolitan Washington, DC area. PDS is a subsidiary Of EnviroSolutions (ESI). ESI and its subsidiaries operate out of 10 separate facility locations covering a widespread service area including five states and the District of Columbia. The five states are Virginia, Maryland, New Jersey, West Virginia and Kentucky