Onsite Soils Evaluation (OSSE)

Before applying for a new septic system, it is necessary to have valid soils testing done.

An OSSE includes soil tests that determine the effectiveness of soil to filter sewage through leach lines, as well as observations of required setbacks, constraints, future repair area, and possibilities for an individual “on-site” septic system. The Soils Evaluation Report produced by the consultant of the particular site tested on a parcel is reviewed and evaluated by an Environmental Health Specialist who generates a Findings Report. The Findings Report is transferable and runs with the land. 

OSSE Requirements:

• OSSE must be conducted by a Soil Testing Consultant. 
• Recertification by a consultant is required for any existing soils reports exceeding 3 years. Our Document Library contains links to required recertification forms. 
• The consultant must schedule inspections to conduct the OSSE. This can be done by calling the inspection line, (530)265-1599.  

Steps to Getting an OSSE Completed

1. Hire a Soils Testing Consultant
2. Submit an OSSE application (see options below): 
   • Apply in Person at Nevada County Eric Rood Center; 950 Maidu Ave., Ste 170 - 1st Flr; Community Development Agency. The following is required to apply in-house:     a
     1. Agreement to Pay form.
     2. OSSE Application
     3. Plat Plan showing proposed work area and directions to the parcel.
     4. Payment made with check/cash/credit card/ money order payment.    
        
   • Apply Online The following is required to apply online: 
     1. Consultants contact information
     2. Agreement to Pay form
     3. Plat Plan showing proposed work area and directions to the parcel.
     4. Payment (the last step of the application process provides a link to Lexis Nexis 3rd party financial site). The balance owed and permit number are needed to make your payment. 
3. Consultant schedules the OSSE
4. Consultant and Nevada County Specialist meet on-site for soils testing
5. Consultant submits Soils Evaluation Report to Nevada County
6. Nevada County Specialist generates Findings Report to determine what type of septic system to install

Updated: April 18, 2025

The County will try to accommodate the requested dates but cannot guarantee availability.