After the installation I started to look more into radon mitigation and became discouraged. Researching immediately made it clear that the system should be fully sealed with a sealed sump pump cover. Tim had re used the previous basic sump cover. I contacted Tim in August shortly after installation to inquire about putting a sealed cover on the sump pump; Tim said that he doesn’t feel it is necessary and tried to talk me out of it but did say he could if it added peace of mind for us. I ordered a digital radon detector and I contacted State Radon Officer Aaron Berndt to inquire about a cover, Aaron said that a cover is needed to seal it tight to make the mitigation system as effective as possible, especially in the winter when the heat is turned on. Aaron also said that without a cover the system would be drawing the air from the house increasing the heating/cooling bills. I left Tim a voicemail asking him to install the cover; Tim did not return that call. After taking measurements for 2 months the levels of radon dropped from just above 4(unsafe level) to a little over 1, below the action level but remember the EPA and WHO state that no level is safe and 1.3 still poses a risk for lung cancer. This week when I called Tim again and explained to him that I would like to have the cover sealed. Tim asked what the levels are and basically laughed, saying I should be calling him to thank him for getting the levels down to the 1 range, although when I originally contacted him he said that he could bring the levels down to around 0. The conversation went back and forth, I explained that the state radon officer recommends the cover, to which Tim replied that he has never heard of a state radon officer and questioned if that is even a real title in the state of Michigan. He then went on to say how the state of Michigan does not regulate Radon contractors; it is between the contractor and the customer, basically saying he doesn’t have to. Tim also stated that sealing is not necessary and this is the how they do radon mitigation now, although all over the USA Radon website and in some of the reviews the sump pump covers are sealed. The work contract also states that they will seal any cracks in the floor/walls since they can be an entry point for radon, which they did not do and proves that a radon mitigation system should be a sealed system. The conversation basically ended with Tim telling me that he installed the system and it is up to me to seal the cover. Tim acted like I was being ridiculous worrying about radon levels in the 1 range and stated that this is the radon level outside. Per the EPA the radon level outside is 0.4 and with a level of 1.3 there is a 2/1,000 chance of getting lung cancer, which is a small chance but still not one worth taking, especially after paying for a radon mitigation system. I decided to look back at USA Radons site, a few notes that I noticed on the USA Radon website are below: -Site states that USA Radon is EPA certified, I cannot find anything online about an EPA radon certification, and the main organizations I found for certification are the NEHA, NRPP and the NRSB. -Site shows license number 6501349350. Note that this is NOT a radon mitigation license, this is a real estate license and it is lapsed (expired 10/31/2018). I wouldn’t have learned about the shortcomings of USA Radon’s mitigation system if I didn’t do research after the system was installed. Tim never suggested re measuring the levels, I learned that through my research, online informational pamphlets recommend using a company that measures the radon levels after installation to ensure their mitigation system is working properly. Another piece of advice online is to never work with a contractor that gives the quote over the phone, since every house requires a radon mitigation system designed for that house. Tim had given the quote over the phone.