Get matched with top indoor air quality testers in Norristown, PA

"I saw NAL East Environmental, read their Profile & was extremely impressed. Their Inspectors’ are Highly Educated Professionals. Words can’t describe how Grateful I am for Mark Stern & Joe Chairmonte. Testing was explained with Professionalism, Knowledge & Compassion. Mark is a Genuine Professional. He was Respectful & Kind as he explained and knew what should be tested. Joe was already set up. They were extremely thorough. After testing, Mark said, “Please call with any questions,” He was true to his word. After finding Acute Mold issues in Our Rental Home of 17+!years. Mark showed much care for Our well-being. It’s RARE to find a Co. with such Caring Inspectors w/High Moral Values, Yet, here they are!! I hired Mark & Joe again for Surface Testing. I’ve since referred Mark & Joe to Family. NAL East is The BEST! Thank you & Many Blessings to Mark & Joe. You are Amazing Assets to NAL Eastern & Our Community!! Jacqueline W., Yardley, PA"

"They arrived within a couple hours of my calling them. The took mold samples and air samples and I believe the results were back in 2 days. They sent a thorough report of their findings. I had a lot of suspicious mold that tested to be toxic."

"The team was very knowledgeable and extremely professional in their cleanup efforts and rectified all problems associated with our water damage due to a recent leak in our basement Tim was fantastic in organizing and completing the project. He also served as a wonderful resource person in recommending a wonderful and honest roofer. Tim's team was courteous, and highly dependable. They removed the mold and repaired the water damage in an expedient manner. Tim's coordination of the cleanup was outstanding. I highly recommend Bioclean for their fast and superb service."

"Work and overall communication was excellent "

"This kind of testing is critical if you are suspicious that your home s air quality is causing respiratory problems for any family member."

"Tim was fast and professional. His work is much appreciated. We would highly recommend this service."

"We had our radon fan replaced by Radon Bros in January 2025. From the beginning, the new fan was noticeably louder than the previous one. At that time, the technician advised us that the increased noise was due to the fan being stronger than our prior unit. Over time, the fan became increasingly louder and ultimately stopped working in early December 2025. When a technician returned to replace the fan, we were informed that the fan originally installed was defective and that Radon Bros had stopped using that manufacturer due to known issues. Despite this, we were charged a $99 labor fee for the replacement. We do not understand why we were responsible for this charge when the failure was due to a defective fan that your company was already aware of and no longer installs. We felt we had no choice but to pay the $99 in order to have our radon mitigation system restored and functioning properly. "

"Good pricing and estimate over the phone. Great communication and prompt and clean service. Radon went from 9.5 to 0.5 in the basement."

"Jeff is a great communicator. His report was very detailed and he took the time to answer all of my questions and my wife's questions. Highly recommended."

"Our project was completed with Complete professionalism by Tony and his project manager, Christian. Work was completed to a very high standard and the job progressed according to the expected timeline. I had no prior experience with AW Martin, but will certainly use them again for upcoming home renovations. Highly recommended."