RTCA® (Radon Testing Corporation of America)

• Professional Radon Testing Products
• Find a Professional
• About Radon and Radon Testing

NRSB

• National Radon Safety Board: Find a certified radon professional
• How to get certified with NRSB – Exam information

NRPP

• National Radon Proficiency Program: Find a certified radon professional
• How to get certified with NRPP

EPA Radon

• Citizen’s Guide to Radon
• Consumer’s Guide to Radon Reduction
• Protocols for Radon and Radon Decay Product Measurements in Homes
• Indoor Radon and Radon Decay Product Measurement Device Protocols
• Health Risks
• Map of Radon Zones
• State Radon Program Links

AARST/ANSI STANDARDS 

• Single-Family Buildings
• Multifamily, School, Commercial and Mixed-Use Buildings
• Quality Assurance
• New Construction
• Radon in Water