Civil-Environmental Engineering
Yuba 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.



  • 1 Soil Mantel test+3 Percolation test (5 to 60 min. per inch) required for new systems.


  • Perc. Rate (min./in.)      Minimum Useable Disposal Area (sq. ft.)

                        5-20                           8,000

                       21-40                          10,000

                       41-60                          12,000


  • Maximum Slope: 30%


  • Vertical Separation: 5' from trench bottom to ground water or

                                               fractured rock.

  • Septic tank capacity: 1000 gal. for 1-3 bedrooms

                                            1500 gal. for 4-6 bedrooms

                                             150  gal. for additional bedrooms

Incorporated Cities

Census-Designated Places​

Unincorporated Towns​

Yuba County Setback Requirements

For a graphical representation of

Yuba County setback requirements:


Links to Yuba County Website

For County home page:

For County's Rules for

On-Site Sewage Disposal:


*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.