If you’ve wondered, “What is a percolation test?” you’re not alone. A percolation test, or perc test, is a key step in determining how well soil absorbs water, which is essential for septic systems. Research shows that soil with a drainage rate slower than 60 minutes per inch may not support standard septic systems, which can significantly impact a property’s usability and value. This simple yet crucial test is often required before granting permits for land development or septic installations. Steve Daria and Joleigh, celebrated real estate investors and cash land buyers, consistently highlight the importance of a perc test when evaluating or preparing land for sale. They have successfully helped many landowners uncover hidden opportunities by understanding their soil’s potential. Don’t miss out on the chance to maximize your property’s value—connect with Steve and Joleigh today to book a free discussion and learn more about the importance of answering the question, “What is a percolation test?”
Key Points
- Definition and Purpose: A percolation test, commonly called a perc test, evaluates how well soil absorbs water. It is a critical step for properties requiring septic systems or assessing land development potential.
- Key Requirements: Most local regulations demand a percolation test before approving septic installations. The test ensures the site can safely and effectively manage wastewater without harming the environment.
- How It Works: The test involves digging small holes in the soil, filling them with water, and measuring water absorption time. Results are expressed as minutes per inch of water drainage to determine suitability for septic systems.
- Impact on Land Value: Land that passes a percolation test often has a higher value as it is more versatile for building or resale. Conversely, failing results can limit usability and require alternative septic solutions.
- Why It Matters: Understanding your soil’s absorption capacity is essential for any landowner or buyer. A perc test affects property development and ensures compliance with local health and safety requirements.
What is a percolation test, and why is it important?
A percolation test, often shortened to perc test, is a method used to check how well soil absorbs water.
This test is especially important for land needing a septic system, as it determines if the soil can manage wastewater safely and effectively.
Without a successful percolation test, you might not be able to install a septic system, which limits the use of the property for building homes or other developments.

To conduct the test, small holes are dug into the ground and filled with water, and then the rate at which the water soaks into the soil is measured over time.
The results show whether the soil drains water quickly or slowly, giving a clear answer about its suitability.
But why does this matter? If the water doesn’t drain properly, it can lead to problems like sewage leaks or contamination, harming the environment and creating health risks.
Knowing the answer to “What is a percolation test?” helps property owners, buyers, and developers make informed decisions about the land’s potential.
It’s a simple but essential step to ensure safety, compliance, and the best use of the property.
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When is a percolation test required for a property?
A percolation test is required for a property whenever there is a need to evaluate how well the soil can absorb water, usually before installing a septic system.
It is a necessary step for rural or undeveloped land where sewer systems are not available.
The test is typically conducted when planning to build a home, a commercial structure, or any development that will generate wastewater.
It helps ensure the soil can properly drain water to prevent environmental or health hazards.
If a property doesn’t pass the test, alternative solutions like engineered septic systems might be needed, or development plans may need to be adjusted.
Local regulations often determine when a percolation test must be done, such as during the permitting process for construction.
Knowing “What is a percolation test?” is important because it allows property owners and developers to meet legal requirements and plan responsibly.
It’s a key step for deciding whether a piece of land is suitable for your intended purpose.
How can a percolation test affect land value?
- Determines Buildability: A successful percolation test can confirm whether the land is suitable for building, especially if a septic system is needed. If the test fails, the land may lose value as it limits development opportunities.
- Impacts Development Costs: If the soil drains well, the cost of installing a septic system is lower, which increases the land’s worth. Poor test results may require expensive engineered systems, making the property less attractive to buyers.
- Influences Market Interest: Land with a passed percolation test is more appealing to potential buyers because it ensures a smoother road to construction. Buyers often avoid properties that come with environmental or legal complications caused by failing the test.
- Ensures Legal Compliance: Passing a test shows that the property meets local health and safety rules. Failing to comply can lower its value by creating legal obstacles for future development.
- Provides Negotiating Power: Property owners can use the test results as a selling point to justify higher land pricing if the test results are favorable. On the other hand, a failed test might push sellers to lower their asking price to close the deal.

What happens if a property fails a percolation test?
If a property fails a percolation test, it means the soil cannot absorb water at a safe and acceptable rate for a septic system to function properly.
This can pose challenges for anyone planning to build on the land since a working septic system is essential for handling wastewater, especially in areas without public sewers.
Failing the test doesn’t always mean the land is unusable, but it may require costly alternatives like specialized engineered systems to manage waste.
These systems can increase the development expense and make the property less appealing to buyers or developers.
Sometimes, local authorities may restrict construction on the land until the issue is resolved.
Additionally, failing a percolation test may lower the property’s value, as it limits potential uses or creates additional hurdles for development.
Understanding “What is a percolation test?” is important because it helps landowners prepare for these possibilities and explore solutions.
Despite the failure, consultants and soil engineers can often recommend ways to improve soil drainage or find other options to make the property suitable for its intended purpose.
How should I prepare my land for a percolation test?
1. Clear the Area
Make sure the site where the percolation test will take place is free of debris, vegetation, and large rocks.
This helps the testers access the soil directly without obstacles.
One of the first steps to understanding “What is a percolation test?” is ensuring the area is clean and ready for accurate results.
2. Mark the Test Location
Work with your contractor or local authority to identify the test’s location.
Mark the exact spot so there’s no confusion, as the test location should represent the soil conditions where a septic system would be installed.
Knowing “What is a percolation test?” can also help you understand why the test placement is critical for future planning.
3. Check for Recent Rainfall
If the ground is either too dry or overly saturated from heavy rain, it can affect the test’s accuracy.
You might need to wait several days after a storm before scheduling the test.
This preparation step ensures trustworthy results that reflect the true condition of the soil.
4. Have Necessary Tools On Hand
Often, dug holes and water might be required before the testers arrive.
Confirm with your contractor ahead of time, as creating the holes ahead of the test can save time.
Understanding “What is a percolation test?” will also help you know why these specific preparations are essential for a smooth process.
5. Review Legal Requirements
Following your local guidelines on how the test should be run is essential.
Some areas have strict rules that might dictate who can perform the test and how long the process might take.
Preparing your land according to these rules ensures compliance and avoids future delays with your project.
What paperwork do I need to prepare before a percolation test?
Before a percolation test, gathering all the necessary paperwork is important to ensure a smooth process.
First, you’ll need a plot plan or site map that shows exactly where the test will be conducted and outlines property boundaries.
You may also need previous soil test results or records for the land, especially if other tests have been performed in the past.
Permits are often required, so check with your local health department or environmental office to see what documentation is needed.
Additionally, those performing the test may request legal descriptions of the property and proof of ownership.
It’s helpful to have communication records with local authorities or contractors about the test to ensure everyone is on the same page.
Understanding “What is a percolation test?” is key to knowing why this paperwork is vital to the process and necessary for accurate results.
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**NOTICE: Please note that the content presented in this post is intended solely for informational and educational purposes. It should not be construed as legal or financial advice or relied upon as a replacement for consultation with a qualified attorney or CPA. For specific guidance on legal or financial matters, readers are encouraged to seek professional assistance from an attorney, CPA, or other appropriate professional regarding the subject matter.