The Engineering Design Standards govern requirements and design standards in connection with main sewer, public and private laterals, and storm drains within the District's service area. For questions about the Engineering Design Standards, please contact the Engineering Department at 707-644-8949. The Engineering Standards may be updated periodically. Please check that you have the most up-to-date version before designing or constructing your project. The documents are combined into one large PDF as well as separated into sections for your downloading convenience.