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Verified Reviews for Radon Detection And Reduction pros in Sylmar, CA

*The Angi rating for Radon Detection And Reduction companies in Sylmar, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

*The HomeAdvisor rating for Radon Detection And Reduction companies in Sylmar, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

Last update on December 06, 2025

Find Radon detection and reduction specialists in Sylmar

Avatar for All Clear Environmental Inc

All Clear Environmental Inc

4.91(
141
)
•Approved Pro

All Clear Environmental Inc

4.91(
141
)
•Approved Pro
Customers say: Quality work
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers
2003 years of experience

All Clear Environmental is Southern California's one-stop solution for asbestos removal, lead abatement and mold remediation. Our team of licensed professionals has over 100 years of combined experience in the thorough, discrete and environmentally responsible removal of hazardous materials. If you think that your property may be at risk for containing asbestos, lead or mold, we can provide you with the most cost-effective solution. And you can be sure that when we're finished, it will be All Clear.

"Abatement and Remediation are not for the weak or weary - whether managing a personal or professional project, proper containment practices and efforts are essential. I will forever recommend and promote All Clear Environmental - a family-run business with hands-on customer relations. Larry Enos and his son, Beckett, put forth great effort to communicate, assess, and manage the process in good faith. All Clear's team of Rigo et al, handled the physical abatement and remediation, in our home. Rigo and his team made us feel 100% safe, confident, and secure throughout each stage - which was no easy feat with children and pets, in a home. And while there are no accolades for being second-round mold recipients, we hit the jackpot in working with All Clear. We have worked with other companies only to be left with poor communication, a tendency to be overcharged, and dishonesty. Beckett was available almost 24/7 to answer questions via text and live calls. When I felt doubt, Beckett made time to discuss alternative avenues and ensure our best interests were at the forefront of every decision. I recommend All Clear Environmental to friends, neighbors, and strangers with 6/5 stars. Your house is your home - and mold is personal. A company that recognizes the need to love your home well, is a gem beyond measure. Thank you, All Clear Environmental - good people attract good people! Gratefully, Jackie"

Jackie D on August 2024

All Clear Environmental is Southern California's one-stop solution for asbestos removal, lead abatement and mold remediation. Our team of licensed professionals has over 100 years of combined experience in the thorough, discrete and environmentally responsible removal of hazardous materials. If you think that your property may be at risk for containing asbestos, lead or mold, we can provide you with the most cost-effective solution. And you can be sure that when we're finished, it will be All Clear.

"Abatement and Remediation are not for the weak or weary - whether managing a personal or professional project, proper containment practices and efforts are essential. I will forever recommend and promote All Clear Environmental - a family-run business with hands-on customer relations. Larry Enos and his son, Beckett, put forth great effort to communicate, assess, and manage the process in good faith. All Clear's team of Rigo et al, handled the physical abatement and remediation, in our home. Rigo and his team made us feel 100% safe, confident, and secure throughout each stage - which was no easy feat with children and pets, in a home. And while there are no accolades for being second-round mold recipients, we hit the jackpot in working with All Clear. We have worked with other companies only to be left with poor communication, a tendency to be overcharged, and dishonesty. Beckett was available almost 24/7 to answer questions via text and live calls. When I felt doubt, Beckett made time to discuss alternative avenues and ensure our best interests were at the forefront of every decision. I recommend All Clear Environmental to friends, neighbors, and strangers with 6/5 stars. Your house is your home - and mold is personal. A company that recognizes the need to love your home well, is a gem beyond measure. Thank you, All Clear Environmental - good people attract good people! Gratefully, Jackie"

Jackie D on August 2024

Avatar for Pure Restoration Inc

Pure Restoration Inc

4.95(
65
)
•Approved Pro

Pure Restoration Inc

4.95(
65
)
•Approved Pro
Customers say: Quality work
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
2001 years of experience

Quality Service You Can Count On! If you are experiencing water damage, mold or fire damage problems, or simply are just looking to remodel your kitchen or bathroom, Pure Restoration can help you! Our experts are highly knowledgeable with mold testing, structural restoration & remediation, including reconstruction for water damage or fire damage, water extraction and services. Pure can deal with virtually any project and takes pride in leaving our customers satisfied! We offer FREE inspections and estimates for your residential home or commercial property. With over 20 years of experience in the industry, Pure Restoration delivers advanced and reliable professional restoration services including mold inspections and testing throughout Los Angeles.

"Very pleased with the work they provided. Susan, the Administrative Assistant/Production Assistant helpful with all my concerns and questions. I’ve received many compliments on the completed project."

Roberta A on November 2025

Quality Service You Can Count On! If you are experiencing water damage, mold or fire damage problems, or simply are just looking to remodel your kitchen or bathroom, Pure Restoration can help you! Our experts are highly knowledgeable with mold testing, structural restoration & remediation, including reconstruction for water damage or fire damage, water extraction and services. Pure can deal with virtually any project and takes pride in leaving our customers satisfied! We offer FREE inspections and estimates for your residential home or commercial property. With over 20 years of experience in the industry, Pure Restoration delivers advanced and reliable professional restoration services including mold inspections and testing throughout Los Angeles.

"Very pleased with the work they provided. Susan, the Administrative Assistant/Production Assistant helpful with all my concerns and questions. I’ve received many compliments on the completed project."

Roberta A on November 2025

Avatar for Radon Solutions California, LLC

Radon Solutions California, LLC

4.88(
4
)
•Approved Pro

Radon Solutions California, LLC

4.88(
4
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
2021 years of experience

Welcome to Radon Solutions California, LLC. We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!

"Absolutely amazing experience. My home radon levels were averaging 5.0 pCi/L. Two days after Edward and his team finished the mitigation job the levels went down to 0.3. Incredible result. I can’t be happier."

Francisco D on December 2018

Welcome to Radon Solutions California, LLC. We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!

"Absolutely amazing experience. My home radon levels were averaging 5.0 pCi/L. Two days after Edward and his team finished the mitigation job the levels went down to 0.3. Incredible result. I can’t be happier."

Francisco D on December 2018

Avatar for Restoration Hunter

Restoration Hunter

5.00(
2
)
•Approved Pro

Restoration Hunter

5.00(
2
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
2022 years of experience

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"He was friendly, very professional, and answered all my questions clearly about how mold happens in a home. His reasonable estimate and scope of work. What are the steps for mold remediation? Furthermore, I had delicate items around the work area. He was very successful in making sure that nothing was damaged. "Think floor demolition in a China shop" where none of the dishes gets broken. I highly recommend restoration Hunter if you have to deal with mold in the home."

Michele M on May 2025

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"He was friendly, very professional, and answered all my questions clearly about how mold happens in a home. His reasonable estimate and scope of work. What are the steps for mold remediation? Furthermore, I had delicate items around the work area. He was very successful in making sure that nothing was damaged. "Think floor demolition in a China shop" where none of the dishes gets broken. I highly recommend restoration Hunter if you have to deal with mold in the home."

Michele M on May 2025

Avatar for Environmental Testing & Research Laboratories, Inc

Environmental Testing & Research Laboratories, Inc

4.85(
347
)

Environmental Testing & Research Laboratories, Inc

4.85(
347
)
Customers say: True professional
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

Avatar for C-Bek Tile & Stone Design Inc

C-Bek Tile & Stone Design Inc

4.95(
192
)

C-Bek Tile & Stone Design Inc

4.95(
192
)
Customers say: True professional
Recommended by 98% of Angi customers
Recommended by 98% of HomeAdvisor customers

C-Bek Tile & Stone Design, Inc. is your choice for a tile and stone fabricator and installer. We’re a full-service shop and handle all residential, retail and commercial jobs. Whether you have a new installation and remodel… when you hire C-Bek, you get the very finest in old world craftsmanship, with a modern flair.C-Bek is a family owned and run business with over 23 years of experience in the industry. We opened in 2006 and have grown mostly through referrals. We are dedicated to the success of your project and go the extra mile. With a contractor’s license, our compahy has the ability to do more for the project than the average tile and stone “guys.” And, not to worry. No job is too large or too small for us… you are treated with the same amount of care and high quality. When you hire C-Bek, you hire the hardest working “tile guys” around.Our WorkThe quality of our work speaks for itself and we strive for your 100% satisfaction. We take great pride in every project, paying attention to the finest detail. And, at the end of the day, your smile is our reward. Take a look at our Gallery to see a sample of our work. Be sure to look at the enlargements so you can see the intricate detail of each piece. Award winning.

"Really sad and disappointed we chose this company. The results look unappealing crooked lines. Late everyday. Weird hours. 9pm. Leaving a mess and throwing grout in our septic area. Omg. Just all bad. He insisted on cash payments and if a check To his personal name. He doesn’t want checks going to his company he said"

Destiny C on January 2025

C-Bek Tile & Stone Design, Inc. is your choice for a tile and stone fabricator and installer. We’re a full-service shop and handle all residential, retail and commercial jobs. Whether you have a new installation and remodel… when you hire C-Bek, you get the very finest in old world craftsmanship, with a modern flair.C-Bek is a family owned and run business with over 23 years of experience in the industry. We opened in 2006 and have grown mostly through referrals. We are dedicated to the success of your project and go the extra mile. With a contractor’s license, our compahy has the ability to do more for the project than the average tile and stone “guys.” And, not to worry. No job is too large or too small for us… you are treated with the same amount of care and high quality. When you hire C-Bek, you hire the hardest working “tile guys” around.Our WorkThe quality of our work speaks for itself and we strive for your 100% satisfaction. We take great pride in every project, paying attention to the finest detail. And, at the end of the day, your smile is our reward. Take a look at our Gallery to see a sample of our work. Be sure to look at the enlargements so you can see the intricate detail of each piece. Award winning.

"Really sad and disappointed we chose this company. The results look unappealing crooked lines. Late everyday. Weird hours. 9pm. Leaving a mess and throwing grout in our septic area. Omg. Just all bad. He insisted on cash payments and if a check To his personal name. He doesn’t want checks going to his company he said"

Destiny C on January 2025

Imperial Home Inspection

4.93(
41
)

Imperial Home Inspection

4.93(
41
)
Customers say: Quick response
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers

We are a home inspection company, in business since 2000. Chris is a Master CREIA inspector and a Certified Member of ASHI. We carry E&O and liability insurance.

We are a home inspection company, in business since 2000. Chris is a Master CREIA inspector and a Certified Member of ASHI. We carry E&O and liability insurance.

20/20 Advanced Property & Mold Inspections

5.00(
27
)

20/20 Advanced Property & Mold Inspections

5.00(
27
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

CRMI #13322 CREIA President, Orange County Chapter ASHI President, Orange County Chapter CREIA Inspector education provider .Master CREIA Inspector - #0086 .ASHI Certified Inspector - #249392 .CRMI (Certified Residential Mold Inspector): (ACAC) American Council for Accredited Certification .IAQC (American Indoor Air Quality Council)-#13288 .Certified Radon Measurement Provider,CDH (California Department of Health Services) #102017RT

"Mike Cantor (20/20 Advanced Property & Mold Inspection) was referred to us by a family member when we recently brought a home. He is the absolute best, most thorough, and professional inspector we have worked with. Mike responded immediately when we contacted him for a home inspection that we wanted done ASAP because of our short escrow time. We were able to set up the inspection in the same week. Mike arrived early on the date of inspection around 8:45 am (start time was 9:00 am). He requested about 7 hours to perform the inspection which caught the owner and realtor both by surprised as most home inspector only gave a cursory 3 hours inspection. Mike was meticulous in his inspection and took time to points out many aspects of the house's construction, remodeling, and reconstruction that we were unaware of. He was extremely detailed in his inspection and documentation with videos, still photos, and even drones (to inspect the roof). Mike was still going strong around the 7th hours which irked the seller/ realtor but was extremely favorable and reassuring to us when we are making such a large purschase/ investment. Mike is a little bit more expensive than your run of the mills home inspector but he is worth every pennies and more. He ended up discovering multiple issues with our house that were not apparent to us on our examinations. We ended up negotiating with the owner to reduce the sale price by $40,000. Mike continued to help us with recommendations after the completion of the inspection on vendors (termite, landscaper, roofer, etc) who he felt were reliable. We can honestly say that Mike Cantor truly loves his work and he is the only inspector we are going to use or recommend going forward. Can't thank you enough Mike."

Tuan N on January 2020

CRMI #13322 CREIA President, Orange County Chapter ASHI President, Orange County Chapter CREIA Inspector education provider .Master CREIA Inspector - #0086 .ASHI Certified Inspector - #249392 .CRMI (Certified Residential Mold Inspector): (ACAC) American Council for Accredited Certification .IAQC (American Indoor Air Quality Council)-#13288 .Certified Radon Measurement Provider,CDH (California Department of Health Services) #102017RT

"Mike Cantor (20/20 Advanced Property & Mold Inspection) was referred to us by a family member when we recently brought a home. He is the absolute best, most thorough, and professional inspector we have worked with. Mike responded immediately when we contacted him for a home inspection that we wanted done ASAP because of our short escrow time. We were able to set up the inspection in the same week. Mike arrived early on the date of inspection around 8:45 am (start time was 9:00 am). He requested about 7 hours to perform the inspection which caught the owner and realtor both by surprised as most home inspector only gave a cursory 3 hours inspection. Mike was meticulous in his inspection and took time to points out many aspects of the house's construction, remodeling, and reconstruction that we were unaware of. He was extremely detailed in his inspection and documentation with videos, still photos, and even drones (to inspect the roof). Mike was still going strong around the 7th hours which irked the seller/ realtor but was extremely favorable and reassuring to us when we are making such a large purschase/ investment. Mike is a little bit more expensive than your run of the mills home inspector but he is worth every pennies and more. He ended up discovering multiple issues with our house that were not apparent to us on our examinations. We ended up negotiating with the owner to reduce the sale price by $40,000. Mike continued to help us with recommendations after the completion of the inspection on vendors (termite, landscaper, roofer, etc) who he felt were reliable. We can honestly say that Mike Cantor truly loves his work and he is the only inspector we are going to use or recommend going forward. Can't thank you enough Mike."

Tuan N on January 2020

Avatar for Dry Down Inc

Dry Down Inc

4.75(
61
)

Dry Down Inc

4.75(
61
)
Customers say: Super punctual
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers

Dry Down Inc. provides commercial, and residential customers with outstanding water damage restoration, water leak detection, mold remediation service, emergency services including the processes of advanced structural drying, dehumidification, flood damage, sewage decontamination and sanitation as well as air duct cleaning. Our trained and certified technicians use the most advanced technology and equipment available to provide the best possible service. More people in California depend on Dry Down than on any other company. Homeowners and landlords trust Dry Down, drying California one square inch at a time! Established in 2002. Dry Down Inc. is a 24hr Emergency Service Company. We offer a 1-2 hr response time. Our main goal at Dry Down is to offer superb services and peace of mind to homeowners and landlords.

"Angel did an amazing job pumping out over 6,000 gallons of water from under our house! Diego came out very quickly to initially assess the damage and then Angel and his team started pumping the water out just a few hours later. They worked hard from 8pm to 2am! Angel was so kind, professional, and helpful throughout the whole process! He responded to all my texts so quickly and communicated with the office for me to get all the documentation that my insurance needed. He even followed up to make sure I had everything I needed. Angel came back multiple times to check on our house and make sure everything was drying properly and that there wasn't any further damage. He left the fans under our house for over an extra week for no additional charge to make sure it was completely dry. Angel was awesome and offered the best customer service!"

Emily H on March 2024

Dry Down Inc. provides commercial, and residential customers with outstanding water damage restoration, water leak detection, mold remediation service, emergency services including the processes of advanced structural drying, dehumidification, flood damage, sewage decontamination and sanitation as well as air duct cleaning. Our trained and certified technicians use the most advanced technology and equipment available to provide the best possible service. More people in California depend on Dry Down than on any other company. Homeowners and landlords trust Dry Down, drying California one square inch at a time! Established in 2002. Dry Down Inc. is a 24hr Emergency Service Company. We offer a 1-2 hr response time. Our main goal at Dry Down is to offer superb services and peace of mind to homeowners and landlords.

"Angel did an amazing job pumping out over 6,000 gallons of water from under our house! Diego came out very quickly to initially assess the damage and then Angel and his team started pumping the water out just a few hours later. They worked hard from 8pm to 2am! Angel was so kind, professional, and helpful throughout the whole process! He responded to all my texts so quickly and communicated with the office for me to get all the documentation that my insurance needed. He even followed up to make sure I had everything I needed. Angel came back multiple times to check on our house and make sure everything was drying properly and that there wasn't any further damage. He left the fans under our house for over an extra week for no additional charge to make sure it was completely dry. Angel was awesome and offered the best customer service!"

Emily H on March 2024

One Source Group LLC

4.69(
39
)

One Source Group LLC

4.69(
39
)
Customers say: Quality work
2001 years of experience

Our company, One Source Group, combines over 40 years of experience in the environmental inspection industry. We offer the appropriate certifications to perform inspections for mold, asbestos, lead paint etc. (Certified Asbestos Consultant, Certified Asbestos Building Inspector, Certified Lead Technicians, Registered Environmental Assessor (REA). We pride our selves with providing timely, affordable and professional inspections for our clients with honest and ethical advice for their projects. What I can say is there are no "hidden charges" in our pricing. We are very upfront about that subject. We are fully insured and certified for the work we perform. Additional Contact: Chuck

Our company, One Source Group, combines over 40 years of experience in the environmental inspection industry. We offer the appropriate certifications to perform inspections for mold, asbestos, lead paint etc. (Certified Asbestos Consultant, Certified Asbestos Building Inspector, Certified Lead Technicians, Registered Environmental Assessor (REA). We pride our selves with providing timely, affordable and professional inspections for our clients with honest and ethical advice for their projects. What I can say is there are no "hidden charges" in our pricing. We are very upfront about that subject. We are fully insured and certified for the work we perform. Additional Contact: Chuck

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Radon Detection and Reduction questions, answered by experts

Radon enters your home when warm air begins to rise and exits through the roof, creating a vacuum that pulls cooler air from under the foundation. Part of that air is radon, which is an invisible, odorless gas that develops naturally when radioactive particles are deep within the ground. Those particles usually come from decaying matter in soil and rocks.

The soil beneath your house is most likely what’s causing an increased level of radon. This is because soil holds radioactivity for a long time and it’s also what most buildings are built on. Another common source of radon is water from a source that hasn’t been through periodic radon tests, such as well water. Over time, the radon from the soil can inhabit other parts of your house like the foundation or plumbing.

Mitigation reduces radon levels, protecting your health and complying with safety standards.

Sampling typically takes 1-3 hours, and depending on the provider, lab results are available within 2-7 days.

What is radon? It’s a radioactive gas that naturally occurs in the ground, forming as uranium and thorium decay. It has no color or odor, so you don’t know if it’s seeping into your building’s foundation. Regular exposure to radon gas increases your chances of suffering from lung cancer. Radon testing measures the air inside your house for the presence of radon gas. If detected, the test will measure the severity of radon levels in your home’s air.

The Sylmar, CA homeowners’ guide to radon detection and reduction services

From average costs to expert advice, get all the answers you need to get your job done.

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