What is a soil evaluation?
A soil evaluation is a licensed soil scientist’s on-site assessment of a property’s soil profile to determine whether the land can support a septic system and, if so, what kind. It reads texture, structure, color, depth to water, and depth to restrictive layers, not just drainage speed.
Where a perc test answers one narrow question (how fast does water drain), a soil evaluation answers the bigger one: what is this soil, and what can it safely handle?
What a soil evaluation covers
The soil scientist opens the soil in a test pit or boring and describes the profile layer by layer: texture (sand, silt, clay), structure, consistency, and color.
They record the depth to the seasonal high water table (read from mottling and gray colors) and the depth to any restrictive layer such as clay or rock.
From those observations they estimate how well the soil will accept and treat wastewater, and they determine the type and size of system the site can support.
Soil evaluation vs. perc test
A perc test times how fast water drops in a hole and reports a rate. It is a single measurement.
A soil evaluation interprets the whole profile and explains why the soil behaves the way it does. It is judgment based on training and observation, not just a number.
Many states have shifted toward the soil evaluation as the primary basis for a septic determination, with the perc test as a supplement or no longer required. Which applies depends on the jurisdiction.
Where it fits in the permit process
A typical sequence is: soil evaluation, then septic system design based on the soil findings, then a construction permit from the health department, then installation by a licensed installer, and finally a final inspection.
The soil evaluation report is the foundation document. The design, the permit, and the installation all flow from what the soil scientist found, which is why an accurate, well-documented evaluation matters so much.
How ServGround fits in
Soil scientists use ServGround to run the business around their evaluations: intake that captures the parcel and property details, scheduling, proposals and invoices, and delivery of the evaluation report through a client portal that stays locked until payment clears. The same parcel and client flow straight from the first call to the final report.
See soil testing softwareThis article is for educational purposes only. Requirements vary by jurisdiction. Consult your state's licensing board or local authority for specific requirements that apply to your project.
Frequently asked questions
- Who can perform a soil evaluation?
- Requirements vary by state. Many jurisdictions require a licensed soil scientist or a registered soil evaluator; some allow other authorized professionals. Always confirm with the local health authority who is qualified in that jurisdiction.
- Do I need both a soil evaluation and a perc test?
- It depends on the state and county. Some require both, some accept the soil evaluation alone, and some still center the perc test. Check the requirement with the local health department before scheduling.
- How long is a soil evaluation valid?
- Many jurisdictions limit how long an evaluation can support a permit application, often a few years. Confirm the expiration policy locally before relying on an older report.
- What does the report include?
- A typical report describes the soil profile, the seasonal high water table and restrictive-layer depths, a site map showing where the pits or borings were taken, and the evaluator’s determination of suitability and recommended system type.
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