---
title: "Radon certification | InspectDay"
description: "Which radon certification an inspector needs, from state rules and the two national programs, with what each requires and costs."
---

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# Radon certification

Some states license or certify radon testers themselves, and two national programs, NRPP and NRSB, certify them as well.

By InspectDay EPA, three states, NRPP and NRSB pages, checked on October 9, 2026 2 min read

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## Check your state’s rule

Illinois, Pennsylvania and Florida each set their own rules for radon testers.

- Illinois licenses testers. The first step is an IEMA-OHS approved qualification course. The state approves the NRPP and NRSB exams for its license.
- Pennsylvania’s Radon Certification Act requires the Department of Environmental Protection to establish, by regulation, a certification program for persons conducting radon gas and radon progeny testing.
- Florida requires a business that charges for radon testing to be state certified. A certified individual must work for a certified business.

Check your state’s health or environmental agency for its rule. EPA requires states that receive indoor radon grants to list only radon service providers credentialed through a state process or by one of two national programs: NRPP and NRSB.

## NRPP

NRPP certifies a Radon Measurement Professional (RMP) for two years.

- Complete a 16-hour RMP initial training course, then pass the NRPP Measurement Professional exam. The exam is 3 hours and costs $175.
- Certification costs $275 initial and $275 renewal for RMP-Standard, or $325 and $325 for RMP-Analytical.
- To certify with a standard device, such as a charcoal test kit, register the device type.
- To certify with an analytical device, such as a CRM, complete a device performance test and submit proof of calibration. Calibrate each analytical device once a year.
- Renew every two years. Each two-year cycle needs 12 hours of continuing education.

## NRSB

NRSB certifies a Radon Measurement Specialist (RMS).

- Complete 16 hours of NRSB-approved classroom training, then pass the NRSB RMS knowledge-based exam.
- The NRSB fee for the RMS is $125 a year, or $200 for two years.
- Complete 8 hours of NRSB-approved continuing education in each certification year.
- At renewal, a CRM needs no new proficiency test if its model has not changed since your last renewal or initial certification. A CRM or electret ion chamber needs an up-to-date calibration certificate.

On this page

- [Check your state’s rule](#check-your-states-rule)
- [NRPP](#nrpp)
- [NRSB](#nrsb)

## Sources

- [US EPA, “Find a Radon Test Kit or Measurement and Mitigation Professional”](https://www.epa.gov/radon/find-radon-test-kit-or-measurement-and-mitigation-professional)
- [Illinois Emergency Management Agency and Office of Homeland Security, “Applying for a License”](https://iemaohs.illinois.gov/nrs/radon/applylic.html)
- [Pennsylvania Department of Environmental Protection, “Radon Certification”](https://www.pa.gov/agencies/dep/programs-and-services/radiation-protection/radon-division/radon-certification)
- [Florida Department of Health, “Radon Professional Certification”](https://floridahealth.gov/environmental-health/radon/certification)
- [National Radon Proficiency Program, “Types of Certification”](https://nrpp.info/certification/types-of-certification/)
- [National Radon Proficiency Program, “How to Renew Your Certification”](https://nrpp.info/certification/how-to-recertify/)
- [National Radon Proficiency Program, “Beginning January 1, 2025: Update to NRPP Exam and Certification Fees”](https://nrpp.info/beginning-january-1-2025-nrpp-certification-fees-updates/)
- [National Radon Proficiency Program, “How to Become NRPP Certified”](https://nrpp.info/certification/how-to-become-certified/)
- [National Radon Proficiency Program, “Device Training & Calibrations”](https://nrpp.info/devices/performance-testing-calibrations/)
- [National Radon Safety Board, “Types of certifications”](https://nrsb.org/for-professional/types-of-certifications/)
- [National Radon Safety Board, “Renew your certification”](https://nrsb.org/for-professional/renew-your-certification/)

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