The Team at Advanced Radon Mitigation and Water Treatment of New Hampshire are - Fully insured Trained and Certified by the AARST National Radon Proficiency Program (NRPP) for Radon Contractor Proficiency. (4 on-staff NRPP Certified Contractors). (The most Certified Radon Contractors in any NH company) Member, in good standing, of the American Association of Radon Scientists and Technologists (AARST) Certified by Cook College at Rutgers University for "Waterborne Radon Proficiency" Certified "Radon information Speaker's Bureau" by the Center of Environmental Research and Technology Institute (CERTI) A Better Business Bureau Accredited Business, ...