The credentials to look for and the EPA's checklist for comparing radon mitigation contractors.
Independent referral service. We don't perform the work ourselves.
The EPA recommends a certified or qualified radon mitigation contractor (EPA Consumer's Guide to Radon Reduction). It recognizes two national programs: the National Radon Proficiency Program (NRPP) and the National Radon Safety Board (NRSB) (EPA). SD DANR links to NRPP- and NRSB-certified residential mitigation providers (SD DANR). NRPP requires certified people to work to the applicable ANSI/AARST standards. The EPA notes these programs usually issue a photo ID card showing qualifications and an expiration date, so ask to see it.
The EPA says to get a contract before work starts that lists the total cost (taxes and permits included), deposit and payment terms, timeline, permits and code compliance, insurance, responsibility for damage and cleanup, any guaranteed radon level, warranties and whether they transfer if you sell.
Retest: a post-mitigation test should be done within 30 days of installation, but no sooner than 24 hours after the system is running. The EPA also recommends an independent follow-up measurement (EPA). For typical South Dakota costs see mitigation cost. We can connect you with local professionals; always verify their credentials yourself.
The EPA says states receiving indoor radon grants must list only providers credentialed through a state process or one of two national programs: the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). SD DANR links to NRPP and NRSB certified mitigation providers.
The EPA says it is wise to get more than one estimate, ask for references and contact some of them.
The EPA says a post-mitigation radon test should be done within 30 days of installation, but no sooner than 24 hours after the system is running, and recommends an independent follow-up measurement too.