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Specialty Materials Testing

Soil Testing Services

A plain-language starting point for homeowners, contractors, and design teams who were told they need a soil test but are not sure which test applies.

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Service overview

What this service involves

“Soil testing” can mean very different things depending on who requested it. A county may be asking a homeowner for a percolation test or soil profile for septic approval. A contractor may need particle-size distribution, plasticity, or compaction data. A utility designer may need corrosivity, electrical resistivity, or thermal resistivity results.

Calicore reviews the request, specification, correction letter, or project objective and identifies the focused test package that answers it. Routine septic field work is concentrated in California, with selected Nevada projects accepted by scope, while shipped-sample laboratory testing and appropriately scoped specialty field programs are available nationwide.

Soil testing explained

“Soil testing” is not one procedure.

A county, contractor, utility designer, or materials supplier may use the same phrase for completely different measurements. Match the requested test to the decision, material, units, and approving agency before collecting a sample or scheduling field work.

Septic approvalSeptic soil and percolation testingGrounding or corrosionWenner four-pin soil electrical resistivityCable and duct-bank designThermal resistivity testingBuried-metal exposureSoil corrosivity laboratory testingEarthwork and classificationSieve, Atterberg, Proctor, and soil classification

Step by step

How the process works

The exact scope is matched to the project, but a typical assignment follows these steps.

  1. 01

    Send the exact request

    We review the correction letter, specification, drawing note, agency message, or design question instead of guessing what “soil testing” means.

  2. 02

    Identify the correct service

    The need may be a septic field evaluation, soil classification, compaction curve, corrosion chemistry, electrical resistivity, thermal resistivity, or a combination.

  3. 03

    Plan field work or sample shipment

    Locations, depths, quantity, packaging, condition, preparation, and schedule are confirmed before testing begins.

  4. 04

    Perform the work and report it

    The method-specific results are issued with engineering interpretation only when that additional service is included.

Review criteria

What the requester needs from soil testing

The test method and sample or field location must match the reason the data were requested.

What you receive

Typical project deliverables

  • Test-scope review
  • Field or shipped-sample testing plan
  • Method-specific data and report
  • Engineering interpretation when included

Common project needs

When this service is useful

  • DIY property owners and owner-builders
  • Contractors answering a plan-check request
  • Civil and electrical design teams
  • Utilities and infrastructure owners

Frequently asked

Soil Testing Services questions

I was told I need a soil test. Where do I start?+

Send the project location and the exact request, plan-check comment, specification, or email you received. Calicore can identify whether it calls for a perc test, soil profile, classification, corrosivity, electrical resistivity, thermal testing, or another focused service.

Can I ship soil samples to Calicore?+

Yes. Thermal, corrosion, classification, plasticity, gradation, and Standard Proctor samples can be shipped nationwide after the laboratory confirms quantity, packaging, preparation, and requested test conditions.

Do all soil tests require a site visit?+

No. Perc testing, soil profiles, and in-situ Wenner measurements require field work. Many laboratory tests can be performed on representative samples shipped to Calicore.

Technical guides

Learn more about soil testing services.

Use these technical articles to understand the methods, limitations, evidence, and decisions behind the service.

Thermal resistivity9 min read

What Is Soil Thermal Resistivity?

A plain-language explanation of thermal rho, what controls it, and why a measured value must include the material condition.

Updated September 16, 2026Read guide

Related services

View Specialty Materials Testing
CivilSoil Testing for Septic SystemsMaterials TestingThermal Resistivity TestingMaterials TestingSoil Corrosivity Laboratory Testing

Request a proposal

What to send us to begin

Send a short description of the work, any plans, specifications, or photographs you have, and tell us what you need the service to provide. Include a project location if it applies.

Request a proposal