Although there are no state regulations for radon testing in Mississippi, the state website recommends to the public hiring a NRPP-Certified Radon Tester (as of Apr 2015). Visit the Mississippi website for details.
Become a certified, you must complete an NRPP-approved course and pass the NRPP exam. InterNACHI’s free, online “Advanced Radon Measurement Service Provide Course” is NRPP- and AARST-approved for both initial certification and Continuing Education. The course details and information about attaining NRPP certification are located at http://www.nachi.org/radon-measurement-service-provider-online-course.htm
For details about become a certified radon tester in Mississippi, visit http://www.nachi.org/mississippiapprovesinternachi.htm