As a water treatment plant operator, also called a water operator, you measure water quality and quantity using computerized equipment. Your job duties include the maintenance and repair of water treatment equipment and water delivery systems. As a water and wastewater treatment plant operator, you collaborate with engineers, chemists, and lab assistants to test water samples to inform your decisions about water treatment systems. Your primary responsibility is to make sure that water is safe for people to drink and use in their daily lives.