Standards for Design of Water Resource Recovery Facilities (WEF Standard 8-23, or WEF 8) is intended to complement the evolving contemporary design references of today. WEF 8 provides ready access to concise critical design information and enables the reader to quickly locate additional information by following cited references. This standard is formatted to present key design criteria from a variety of design resources on tables and bulleted lists for easy access. WEF 8 is intended for seasoned design professionals familiar with wastewater resource recovery concepts, the design process, facility operations, and the regulatory basis of water pollution control. This reference will serve as a design tool to quickly identify the most relevant design criteria for the more commonly used water resource recovery operations and processes. It is recommended that the reader not rely solely on information presented in this standard as it is not inclusive. A thorough understanding of the principles behind these summary chapters is necessary for the correct application and use of all information contained in this reference.