If you’re planning to build a home or install a septic system in Utah, you’ve probably heard the term “perc test.” For many homeowners, it’s one of the first steps in the process—and one of the most important.
Whether you’re building in Heber, Park City, Wasatch County, Summit County, or Utah County, a perc test helps determine if your land can safely support a septic system. In this guide, we’ll walk you through what a perc test is, why it matters, how much it costs, and what happens if your property doesn’t pass.
A perc test (short for percolation test) measures how quickly water drains through the soil on your property. This is critical because septic systems rely on the soil to filter and treat wastewater after it leaves the tank.
In simple terms, a perc test answers one key question:
Can your soil safely absorb and treat wastewater?
If the answer is yes, you can move forward with septic system design. If not, you may need an alternative solution.
In Utah, septic systems are regulated at both the state and county level to protect groundwater and public health. A perc test is typically required before:
Counties like Wasatch County, Summit County, and Utah County require soil testing and site evaluations before issuing permits.
Without a perc test, you won’t be able to move forward with a legal septic installation.
While the process can vary slightly depending on the county and property, most perc tests follow a similar procedure.
A professional evaluates your property to identify the best location for the septic system and drain field. This includes looking at:
Small holes are dug in the proposed drain field area. These holes are typically:
Multiple holes are tested to ensure consistent results across the area.
The holes are filled with water and allowed to soak. This step simulates real-world conditions when wastewater enters the system.
After soaking, the holes are filled again, and the time it takes for the water level to drop is measured.
This is recorded as minutes per inch, which tells engineers how quickly your soil absorbs water.
Based on the results, your property will be classified as:
Perc test results vary, but in general:
If the soil drains too quickly or too slowly, additional design considerations are required.
Failing a perc test doesn’t mean your land is unusable—it just means a standard septic system won’t work.
Here are your options:
An alternative onsite wastewater treatment system (AWTS) is designed for challenging soil conditions. These systems treat wastewater more thoroughly before it enters the soil.
In some cases, expanding or relocating the drain field can improve performance.
Certain soil treatments can improve drainage, though this depends on the property.
In rare cases, connecting to a sewer system or exploring other wastewater options may be necessary.
The cost of a perc test in Utah typically ranges from:
Costs depend on:
Additional costs may include:
Several factors can influence how your soil performs during a perc test.
Testing during wet seasons or after heavy snowmelt (common in Park City and Summit County) can affect results. Dry conditions typically provide more accurate readings.
Steep slopes can impact how water moves through soil and may require specialized system design.
High groundwater levels can prevent proper wastewater absorption and may require engineered systems.
It’s best to schedule a perc test:
Waiting too long can delay your project timeline.
Utah’s mountain regions—especially Heber, Park City, Wasatch County, and Summit County—present unique challenges:
Working with a local professional ensures:
Perc test results directly influence the cost of your septic system.
This is why the perc test is one of the most important early steps—it helps you understand your total project investment upfront.
A perc test is a small step that plays a big role in your building project. It determines whether your property can support a septic system and guides the design, cost, and installation process.
In Utah’s mountain communities, where soil and terrain can vary widely, this step is especially important.
If you’re planning to build or install a septic system in Heber, Park City, Wasatch County, Summit County, or Utah County, working with an experienced local contractor can make the process smooth and stress-free.
At Regal Service, we help homeowners through every step—from perc testing and design to excavation and full septic system installation.
If you have questions or want help getting started, we’re here to help.
