Standard Specifications

The Sanitary Sewer and Recycled Water Standards (Standard Specifications) govern requirements, design, and all work in connection with main sewer, public and private laterals, and recycled water systems construction within the NapaSan service area (PDF). For questions about the Standard Specifications, please contact the NapaSan Engineering Department at 707-258-6000.

The Standard Specifications may be updated periodically. Please check that you have the most up-to-date version before designing or constructing your project.

Sections & Sheets

Standard Specifications
Revision Date
Complete Document (PDF)
June 2018
Table of Contents (PDF)
June 2018

Volume 1: General Conditions (PDF)

January 2016

Volume 2: Sanitary Sewer (PDF)

June 2018

Volume 3: Recycled Water (PDF)

June 2018


Standard Details: Sanitary Sewer
Revision Date

SS-1: Sanitary Sewer Cleanout (PDF)

January 2016

SS-2: Standard Residential Public Lateral for New Construction (PDF)

January 2016 

SS-3: Sewer Lateral Crossing Above Utility, No Conflict in Grade (PDF)

June 2018

SS-4: Simple Sewer Lateral Break, Sewer Below Utility, No Conflict in Grade (PDF)

May 2012

SS-5: Simple Sewer Lateral Break with Conflict in Grade (PDF)

May 2012

SS-6: Sewer Lateral Layout 1 (PDF)

May 2012

SS-7: Sewer Lateral Layout 2 (PDF)

January 2016

SS-8: Drop Type Manhole (PDF)

June 2017

SS-9: Standard Pre-Fab Manhole (Sheet 1) (PDF)

June 2018

SS-9A: Standard Pre-Fab Manhole (Sheet 2) (PDF)

June 2017

SS-10: Barrel Section Joints for Standard Pre-Fab Manhole (PDF)

January 2016

SS-11: Typical Manhole Using Impression Ring (PDF)

January 2016

SS-12: Pre-Cast Concrete 48 Inch by 24 Inch Reducer Slab for Manholes (PDF)

May 2012

SS-13: Typical Method for Setting Appurtenances (PDF)

May 2012

SS-14: Standard 24 Inch Manhole Frame and Cover (PDF)

May 2012

SS-15: Bolt-Down 24 Inch Manhole Frame and Cover (PDF)

May 2012

SS-16: 36 Inch Diameter Manhole Frame and Cover (PDF)

May 2012

SS-17: Typical Installation Irrigation “Subtraction” Meter (PDF)

May 2012

SS-18: Standard Casing Installation (PDF) 

June 2018

SS-19: Redwood Check Dam (PDF)

May 2012

SS-20: Trench Dams (PDF)

June 2018

SS-22: Three Stage Sand and Grease Interceptor (PDF)

January 2016

SS-23: Sanitary Sewer Sampling Box (PDF)

January 2016

SS-24: Standard Trench Section (PDF)

January 2016

SS-25: Standard Tracer Wire Installation Detail (PDF)

January 2016

SS-26: Abandoned Pipe Plug (PDF)

May 2012

SS-27: Abandoned Manhole (PDF)

May 2012

SS-28: Flush Hole (PDF)

January 2016

SS-29: Trench Section for Replacement/Repair of Residential Sewer Lateral (PDF)

January 2016


Standard Details: Recycled WaterRevision Date

RW-1: Concrete Anchor Blocks for Vertical Bends (PDF)

January 2016
RW-2: Concrete Thrust Blocks for Horizontal Bends (PDF)

January 2016

RW-3: Vertical Offset (PDF)

May 2012

RW-4: Recycled Water Trench Section (PDF)

January 2016

RW-5: Temporary Blow-off and/or Metered Connection for Mains Under Construction (PDF)

May 2012

RW-6: 2 Inch Blow-Off Assembly (PDF)

January 2016

RW-7: 3/4 inch and 1 inch Water Service Lateral for 3/4 Inch and 1 inch Meters (PDF)

July  2012

RW-8: 2 Inch Water Service Lateral for 2 Inch or 1-1/2 Inch Meter (PDF)

May 2012

RW-9: 4 Inch Water Service Lateral for 3 Inch Meter (PDF)

May 2012

RW-10: 4 Inch Water Service Lateral for 4 Inch Meter (PDF)

May 2012

RW-11: 6 Inch Water Service Lateral for 6 Inch Meter (PDF)

May 2012

RW-12: Reduced-Pressure Backflow Device (PDF)

January 2016

RW-13: Gate Valve (PDF)

January 2016

RW-14: Pressure Reducing Valves (PDF)

May 2012

RW-15 1 Inch Air Release and Vacuum Valve Assembly (PDF)

May 2012

RW-16: 2 Inch Air Release and Vacuum Valve Assembly (PDF)

May 2012

RW-17: Recycled Water Line Notes (PDF)

January 2016

RW-18: Recycled Water Sign (PDF)

May 2012