Residential Radon Testing in Southern California

Overview

Why On-Site Radon Testing Matters

Radon levels can vary significantly from one property to the next due to local geology, soil conditions, foundation type, and building configuration. Desktop screening tools and regional radon maps cannot determine actual indoor radon concentrations for a specific site.

GeoTed specializes in comprehensive radon testing and soil gas investigations to support residential and small-site construction projects throughout Southern California. Our on-site testing evaluates actual indoor air and subsurface conditions, ensuring projects meet applicable regulatory requirements and uphold the highest safety standards.

GeoTed is NRPP-certified, a credential recognized by the U.S. Environmental Protection Agency (EPA) and accredited by the ANSI National Accreditation Board (ANAB) under ANSI/ISO/IEC 17024. This certification ensures our testing methods and reports meet stringent state and industry standards, providing defensible, reliable results for permitting, real-estate transactions, and mitigation decision-making.

The result is clear, compliant documentation you can confidently submit to building departments, lenders, and design professionals—without assumptions or unnecessary delays.

Certified Inspections.

Fully Insured.

State Board Licensed.

Other Geotechnical Services We Provide

We offer a full suite of geotechnical services, including comprehensive geotechnical investigations, solar foundation design, and environmental engineering. As a trusted geotechnical engineering consultant, we provide expert solutions for a wide range of projects.

On-Site Consultations & Environmental Inspections

Field-based evaluations of soil, rock, slope, and environmental conditions to guide safe and sustainable project design. Services include on-site cons

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Engineering Geology

Studying soil, rock, and groundwater conditions to guide safe, efficient, and sustainable project design.

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Methane Soil Gas Survey

Methane level detection in soil to identify leaks or contamination.

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Have questions? We have answers.

Frequently Asked Questions About On Radon Testing

Understanding site conditions—including radon levels, soil gas behavior, subsurface conditions, and foundation performance—can be complex. That’s why we’ve answered the most common questions clients ask about radon testing, soil gas investigations, testing methods, reporting standards, and foundation-related considerations.

These insights are designed to help homeowners, buyers, builders, and real-estate professionals better understand site-specific risks, regulatory expectations, and next steps—so you can plan your project, transaction, or construction with confidence and clarity.

If we didn’t cover your question or you need project-specific guidance, please contact GeoTed to discuss your site conditions and testing requirements.

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What is radon and why does it matter?

Radon is a naturally occurring radioactive gas produced by the breakdown of uranium in soil and rock. It can migrate through the ground and enter buildings through cracks, joints, and openings in foundations. Long-term exposure to elevated radon levels is a leading cause of lung cancer among non-smokers, which is why testing is strongly recommended.

How is radon testing performed?

GeoTed conducts on-site radon testing using NRPP-approved methods. Testing devices are placed inside the structure for a required monitoring period to measure indoor radon concentrations. Results are documented in a clear report suitable for homeowners and real-estate transactions,.

What happens if elevated radon levels are detected?

If elevated radon levels are identified, mitigation options can be evaluated. Radon mitigation typically involves sub-slab depressurization or ventilation systems designed to safely redirect radon gas away from occupied spaces.

Are GeoTed’s radon tests certified and defensible?

Yes. GeoTed is NRPP-certified, a credential recognized by the EPA and accredited by the ANSI National Accreditation Board (ANAB) under ANSI/ISO/IEC 17024. This ensures testing methods and reporting meet recognized industry and regulatory standards.

How long does radon testing take?

Most radon tests require a minimum monitoring period, depending on the testing method and project needs. GeoTed will recommend the appropriate testing duration and coordinate placement, retrieval, and reporting to avoid unnecessary delays.

Ready to schedule your project? Let’s take a look at your site.

Whether you need a hillside assessment, drainage review, foundation excavation observation, or an escrow geological inspection, GeoTed provides clear, practical guidance for residential and small-site projects.

Request a Quote Call (818)-639-2396