Atlantic Radon recently installed a radon remediation system at our house. Our radon levels went from 4.5 to .8, so we are very happy with the results. I find the owner, Tom, to be highly knowledgable, professional and honest. Another company wanted to charge more than double to do unnecessary work. Tom took a step by step approach, meaning that if the initial radon remediation did not do the trick, he would then look into doing additional work like sealing the crawlspace. He also didn't try to upsell me on a sump pump, pointing out the reasons why it wasn't necessary at this time. If you go with this company, you can't go wrong!