Radon Testing and Monitoring · Los Angeles
Radon testing and monitoring
for Los Angeles homes.
Radon is invisible, odorless, and easy to ignore. Baseline helps homeowners understand their risk, measure properly over time, and know when action is needed.
Serving Woodland Hills, the San Fernando Valley, and surrounding Los Angeles communities.
The Invisible Risk
You cannot smell radon.
You cannot feel it.
You have to measure it.
Radon is a naturally occurring radioactive gas that can enter homes through soil contact, foundation cracks, crawlspaces, and other pathways. It is widely recognized as a significant lung cancer risk factor, especially because it often goes unnoticed for years. There are no symptoms that tell you it is there.
The EPA sets an action level of 4.0 pCi/L. Average indoor levels in the US are around 1.3 pCi/L. Levels in individual homes can be much higher. The only way to know your home's actual level is to measure it, over enough time for the reading to be meaningful.
Why This Matters to Baseline
Our family only found out
because of a chance conversation.
In 2022, a casual online discussion about indoor air quality led to a question we had never thought to ask. We decided to test our home in West Hills. The result was nearly four times the EPA's recommended action level. Our kids had been in that house. We had no symptoms, no warning, and no reason to know without testing.
We addressed it. We also started asking what else might be happening in the home's air that no one had ever measured. That question became Baseline.
California homes
California homes can have radon too.
Many homeowners assume radon is primarily a Midwest or East Coast problem. That assumption is not reliable. Radon levels vary from home to home based on geology, foundation type, ventilation patterns, soil contact, pressure differences, and construction details. Two homes on the same street can have very different readings.
The only reliable way to understand your home's radon level is to measure it directly, over a meaningful time period.
Risk can differ significantly between neighboring homes. Your neighbor's test result says nothing about what is happening in your home.
Prior low readings do not always represent long-term or seasonal conditions. Radon levels can shift with weather, season, ventilation changes, and soil pressure.
Continuous monitoring provides a more complete picture than a single snapshot. Trends over time are more informative than one reading taken on one day.
Homes with slab foundations, crawlspaces, basements, or significant soil contact carry elevated baseline risk factors worth understanding.
A Better Picture Over Time
Radon is not a
one-moment problem.
Radon levels can shift with season, weather, ventilation, foundation pressure, and home operation. A credible radon strategy should respect dwell time and long-term patterns, not just a single snapshot.
Short-Term Screening
Typically 48-96 hours. Useful as an initial signal to identify whether further testing is warranted. Limited in reliability because radon levels vary with short-term conditions. Closed-house protocols help, but variability remains.
Certified Testing
Appropriate when a formal, documented result is needed for real estate transactions, compliance, insurance purposes, or when a remediation decision requires a certified finding. Performed by a licensed radon measurement professional.
Continuous Monitoring
Sensor installed in the home over months or seasons. Captures seasonal variation, confirms that levels remain within an acceptable range, and provides ongoing visibility for homeowners who want a complete picture of their home's air over time.
Risk Review, Monitoring, and Referral
During the assessment, Baseline documents foundation type, crawlspace conditions, soil contact, and ventilation patterns that influence radon entry. Ongoing monitoring is available as a membership upgrade. When sustained readings cross the EPA action level, Baseline refers to a certified mitigator. All data belongs to the homeowner.
Measured, Careful, and Honest
Baseline does not
pretend to capture a definitive picture from a quick visit.
A 90-minute assessment can identify risk factors and take an initial reading. It cannot substitute for the dwell time a credible radon evaluation requires.
Is this for you?
Homes that benefit most
from radon monitoring.
These are situations where radon monitoring provides clear value. If one or more applies to your home, it is worth understanding your risk.
Slab foundations, crawlspaces, or basements
Homes with significant soil contact are the most common pathway for radon entry. Foundation type is one of the primary risk factors reviewed during a Baseline assessment.
San Fernando Valley, West Hills, Woodland Hills, Simi Valley
Homeowners in these communities who want better visibility into their home's radon risk. Local geology varies and individual home conditions matter more than regional averages.
Prior elevated radon readings
If a prior test returned an elevated result but mitigation was not pursued, or if the result was borderline, ongoing monitoring provides a clearer picture than a single historical reading.
Homes that have completed mitigation
Mitigation systems can shift in effectiveness over time. Continuous monitoring confirms that the system continues to perform and alerts the homeowner if levels increase.
Families who want a complete air quality picture
Radon is one part of a broader set of indoor air risks that includes PM2.5, VOCs, CO2, humidity, and combustion gases. Baseline brings these signals together in a single picture of the home.
New homeowners or recent renovation
Purchasing a home or completing structural work changes the risk profile. Prior owners may not have tested, and construction activity can disturb soil pathways. A fresh baseline is appropriate.
The bigger picture
Radon belongs in the larger home health picture.
Radon is one part of a broader indoor air picture that includes fine particulate matter, VOCs, carbon dioxide, humidity, temperature, carbon monoxide, ventilation, and filtration. Baseline brings these signals together so the homeowner can understand how the home is performing over time, not just in one dimension.
Service Area
Radon testing and monitoring for Los Angeles homes.
Baseline serves homeowners across Woodland Hills, West Hills, Calabasas, Tarzana, Encino, Sherman Oaks, Studio City, the San Fernando Valley, and surrounding Los Angeles communities within a 50-mile radius.
Common questions
What to know about radon.
Is radon a problem in Los Angeles?
Can you smell or feel radon?
Is radon testing included in the $195 Baseline Assessment?
What happens if readings are elevated?
What areas do you serve for radon testing?
Get started
The only way to know
is to measure.
Radon is invisible. Your home's risk should not be invisible too. Start with a Baseline Assessment and understand whether radon belongs in your long-term monitoring plan.
Questions about your home's specific risk factors? Call or text us at 818-237-3404.
CSLB #1153130 · Los Angeles · 818-237-3404