Civil-Environmental Engineering
Tehama County

Cities and towns (requirements may differ)​

Summary of Specific Requirements For Gravity Systems

for Single Family Dwellings*

The following is in addition to the items listed on the FAQ page for Gravity System Requirements.


The county follows the Uniform Building Code, with the following exceptions:


  • Replacement Area, Residential: 100%   (Commercial: 300%)


  • Maximum Slope: 30%


  • Vertical Separation: 5' to water table

                                          3' for lots 10 ac. or more (on approval)

                                          6" to temporary perched water table

                                          2' to factured rock & rapid soil


  • Septic tank capacity: 1200 gal. for 1-4 bedrooms

                                            1500 gal. for 5-6 bedrooms



Setback Definitions:


  • Perennial Stream: one that flows all year.

  • Intermittent Stream: one that is not perennial, but flows more than 2 months a year.

  • Ephemeral Stream: one that is not intermittent, but flows immediately after a storm.




Tehama County Setback Requirements

For a graphical representation of

Tehama County setback requirements:


*The information on this page is a summary for quick reference only and may not represent the latest standards.  For complete and up-to-date information, see each counties official website.

Links to Tehama County Website

For County home page:

For County's Rules for

On-Site Sewage Disposal: