The City of Mission has 1 Wastewater Treatment Plant located south of the Expressway on Highway 107 and Conway. The plant is capable of treating 9.0 million gallons of wastewater/sewage daily, but the average flow is 6.2 million gallons daily. In a year, the plant treats approximately 2.2 billion gallons of wastewater. The plant is an activated sludge plant that uses ultra-violet light to disinfect instead of chlorine. All of the operations of this plant are under the strict monitoring of applicable state and federal agencies.