In 2006, a 7,000 square foot water treatment facility was constructed at the Oakdale Public Works campus. The facility uses a granular-activated carbon (GAC) system to remove PFAS, and produces 2,400 gallons per minute of filtered water. GAC is made from organic materials that are high in carbon. Heat, in the absence of oxygen, is used to increase (activate) the surface area of the carbon. The activated carbon removes certain chemicals that are dissolved in water passing through a filter containing GAC by trapping (adsorbing) the chemical in the GAC.