How much does a percolation test cost? A soil percolation test typically costs between $50 and $100, depending on the region. A soil percolation test is a way to determine how quickly water will drain through the soil. The test measures the rate of water discharge from a given area over time and can be used to help determine the best location for a septic tank, identify potential flooding risks, or characterize groundwater availability.

It depends on where you live and the company you go through. For example, I did a percolation test through my local water department, and it cost $10. But, if you go through a private contractor, it can cost anywhere from $50 to $100 or more.