AV Environmental Technologies- Los Angeles Septic Engineer
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Los Angeles Soils Engineer design of test

Frequently Asked Questions

What is a percolation test?
A percolation test, also called a perc test, is a test to determine the suitability and absorption capability of the soil for a septic system drain field also called an Onsite Wastewater Treatment System.

Why do I need a percolation test?
If a sewer system is not available, a code compliant method for disposing of effluent is essential and required. A successful percolation test enables the design of an Onsite Wastewater Treatment System.

How long does it take to complete the percolation testing and the report?
Typically, the scheduled time for testing and completing the report is two to three weeks after receiving the signed contract and the retainer fee. However, depending on our workload and other circumstances, this time frame may vary.

What is the difference between a conventional and a non-conventional Onsite Water Treatment System?
A conventional Onsite Wastewater Treatment System has percolation rates of more than five (5)
minutes per inch and less than 60 minutes per inch for leach lines, leach beds and infiltrative chambers type sewage disposal systems. For seepage pits, absorption rates that exceed 5.12 gallons per square foot of dispersal area per 24 hours or less than 0.83 gallons per square foot of dispersal area per 24 hours do not meet the minimum requirements for conventional Onsite Wastewater Treatment System.Properties not capable of supporting a conventional Onsite Wastewater Treatment System must secure approval from the regulating agency to install a non-conventional Onsite WastewaterTreatment System.

Example of a Residential Wastewater Treatment Plant:
Residential Wastewater Treatment Plant designed by Los Angeles Engineer

Other Helpful information

Diagram of typical Septic System

los angeles septic system design

Schematic of a Seepage Pit

los angeles seepage pit design


Video Explaining How a Septic System works


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