Why a Percolation Test for Septic Tank is Crucial for Your Health and Environment
Adding a septic system to your property can be a crucial step in protecting the health and safety of your family and the environment. However a properly functioning septic system requires more than just installing a septic tank and a drain field. The soil in the leach field area must be sufficiently permeable to absorb the liquid effluent flowing into it. If it lacks the necessary absorption capacity, untreated effluent may back up and contaminate groundwater and surface water sources. This is why a percolation test for septic tank is essential.
What is a Percolation Test for Septic Tank?
A percolation test, often referred to as a perctest, is a soil test that measures the level of liquid absorption of the soil where the proposed septic tank will be located. This test determines how quickly the material from the septic system will be absorbed into the soil. The test involves digging test holes and measuring the time it takes for water to drain through the soil. The results of the test are expressed in minutes per inch (MPI) and are used to determine the suitability of the site for a septic system.
Why is a Percolation Test Needed?
- Prevents Water Contamination
- Ensures Soils Absorb Waste Properly
- Reduces Health Risks to Family and Surrounding Property Owners
- Helps Design an Efficient Septic System
How to Perform a Percolation Test
A percolation test for septic tank involves the following steps:
- Drilling a Test Hole
- Measuring Water Inflow
- Draining Water through Soil
- Measuring Time it Takes to Drain Water
- Interpreting Results
Factors Affecting Percolation Rate
Several factors can affect the percolation rate of a site, including:
- Soil Type and Texture
- Presence of Impervious Layers
- Water Table Level
- Compaction and Moisture Content of Soil
- Temperature

What if the Land Doesn't Pass the Percolation Test?
If the percolation test results indicate that the land cannot support a septic system, there are alternative solutions available, such as engineered systems or other innovative options. In this case, it is recommended to consult with a qualified septic professional to explore alternative solutions.
Importance of Hiring a Qualified Professional
When hiring a professional to perform a percolation test for septic tank, make sure to choose a licensed and experienced person. They will ensure that the test is performed correctly and that the results are accurate and reliable.
Conclusion
A percolation test for septic tank is a crucial step in determining whether a property can support a septic system. It ensures that the soil is able to absorb the waste properly, prevents water contamination, and reduces health risks to family and surrounding property owners. By understanding the importance of a percolation test and hiring a qualified professional to perform the test, property owners can ensure that their septic system is installed and functioning properly
Additional Resources:
For more information on septic systems, visit:
https://www.epa.gov/septic/basic-information-about-wastewater-treatment-and-disposal
https://www.cdc.gov/healthywater/drinking/nat_dis/tkts/index.html