Mike Brown, Senior Superintendent of Operations, Cairo District, said he expects a continued smooth transition to the new plant, "Groundwater is not new to our community. We have switched to a groundwater source in recent years because of flooding and temporary operational issues. This is an important investment in the infrastructure of our Cairo District." Illinois American Water monitors and tests the drinking water in the Cairo District continuously. Ongoing tests confirm the water continues to meet all regulatory water quality standards. Cairo is the southernmost city in Illinois and the county seat of Alexander County. About American Water American Water (NYSE: AWK ) is the largest regulated water and wastewater utility company in the United States. With a history dating back to 1886, We Keep Life Flowing® by providing safe, clean, reliable and affordable drinking water and wastewater services to more than 14 million people with regulated operations in 14 states and on 18 military installations.