The Rio Dell wastewater system serves approximately 1,100 customers, and consists of a network of wastewater collection pipes, manholes, clean outs, and pumps that convey wastewater to the treatment plant located at 475 Hilltop Drive. The City of Rio Dell WWTP utilizes an aerated activated sludge process to provide secondary treatment of wastewater. In 2013 The City completed a major plant upgrade which replaced the old conventional Wastewater plant with the new Activated Sludge Process to address nutrient removal. The project also included construction of the flood irrigation field located in Metropolitan.
Since the plants construction the City has received several awards.
2010 Project of the Year, Solids and Disinfection Project Upgrade- Presented by American Society of Civil Engineers, San Francisco Section
2013 Water/Wastewater Project of the Year- Presented by American Society of Civil Engineers, San Francisco Section
2013 Project of the Year Environment Category- Presented by Sacramento Chapter of the American Public Works Association
2014 Engineering Excellence Award- Presented by American Council of Engineering Companies
2014 Wastewater Plant of the Year- Presented by North Coast Section of the California Water Environment Association