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Certified Radon Services Providers

Certified Radon Services Providers

The Radon Program certifies all radon service providers operating in California. California law requires all radon professionals to be approved by either the National Radon Proficiency Program (NRPP) or National Radon Safety Board (NRSB). There are no professional groups that are currently exempt from this requirement, including Home Inspectors, Industrial Hygienists, Registered Environmental Assessors (REAs), and Licensed Geologists. 

The California Department of Public Health does not endorse or recommend any company or individual over another. As with any home service, you are advised to get more than one estimate. The lists below are not updated daily; to verify whether a service provider not listed here is certified, you can contact us via email for the most up-to-date information.

Testers

Professional testers can provide test results faster than using a do-it-yourself test kit. Use a professional tester during a real estate transaction. They are also recommended for testing multi-family housing units, schools, non-residential buildings, and anytime you want quick results. The testers listed here have met their board requirements and are certified to operate in California.


​​CERTIFICATION NUMBER

​​NAME

​EXPIRATION DATE

​STATE

​​CONTACT INFORMATION

​111851-RMP
​Brett Brumbaugh
​2/28/2025
​Ohio
​419-392-2011
​113748-RMP
​Brooklynn Marcus
​4/30/2025
​California
​310-294-0900
​9SS0048-RMS
​Carol Noland
​6/30/2025​
​California
​805-214-6378
​107053-RMP
​Charles McKee
3/31/2025​Texas​
​832-389-6300
24MS044-RMS​​Chloe Hudson
5/30/2026​Oregon​​971-275-3719
​100318-RMP
Christine Jordan​
​5/31/2026
​California
562-495-5777​
14306-RMP​
​Christopher Olsen
​4/30/2026
California​​831-262-8859
​107918-RMP
Cory Martini​​2/28/2025
​California
​916-838-7365
​112948-RMP
​Danny Huerta
​6/30/2024​
California​213-507-0917​
​113683-RMP
​David Fierro
​4/30/2025
​New York
212-629-0690​
114095-RMP​
​David Grunat
​2/28/2026
California​510-756-0741​
​106759-RMP
David Tillema​​3/31/2025
California​​949-289-3568
102942-RT​
Dennis Ironi​​3/31/2026
California​310-430-4440​​​
​104582-RMP
​Derrick Quach
​1/31/2026
California​​510-786-9751​
​113719-RMP
​Destiny Johnson
​4/30/2025
California​310-622-8864​
​107620-RMP
​Eddie Huchingson
​3/31/2025
California​805-908-9274​
​106364-RMP
​Edward Riley
8/31/2024​California​530-583-6653​
​113902-RMP
Ellen Bennett​​7/31/2025
​Florida
941-232-9627​
​​113534-RMP
Fred Ellrott Junior​​6/30/2025
California​805-732-2476​
​114327-RMP
​Gabriela Cyrulik
​5/31/2026​
​California
201-888-5423​
​111714-RMP
​Jacob Epperson
12/31/2024Missouri​251-360-9514​
​114310-RMP
James Mayfield​
​4/30/2026
California​310-880-9647​
113870-RMP​
Jason Alaraz​7/31/2025​California
714-713-0805​
107969-RMP​
Jason Gregory​​5/31/2026
​California
​805-244-6687
​​​102014-RMP
​Jeffrey Noel
​5/31/2025
California​​​559-348-2200
​108660-RMP
​Jennifer Sims
6/30/2024​​ Kentucky
​502-410-5000
112497-RMP​​
Jeremy Wesctott​
​11/30/2025
 Michigan​​734-649-9680
​110989-RMT
​Jessica Belland
​2/28/2026
​California
310-218-1855​
108870-RMP​
John Henderson​​12/31/2024
​California
​805-280-6616
​111790-RMP
Jonathan Feeney-Mosier​​1/31/2025
California​619-458-0309​
​13SS057-RMS
​Jonathan Massey
8/30/2025​California​​310-978-8281
23MS096-RMS​
Jooho Lee​​​12/30/2025
California​818-818-8972​
​106128-RMP​
​​Judith Woods​
​12/31/2025
California​805-563-0100​
9SS0029-RMS​
​Karen Shockley
9/30/2025​
California​619-276-5901​
​103081-RMP
​Kathleen Williamson
​5/31/2026
California​860-298-6392​
​113718-RMP
Katrina Scherr​4/30/2025​California​916-458-1098​
​111326-RMP
Kayla Parzynski​​6/30/2024
California​805-732-1272​
24MS028-RMS​
Kyle Hamil​​3/30/2026
​Texas
972-951-4490​
113778-RMP​
​Lynn Laborde
​5/31/2025
California​909-645-3826​​
113880-RMP​
Mahima Hettiarachchi​​6/30/2025
​New York
212-629-0690​
​113400-RMP
Mariah Ford​11/7/2024​ Kentucky​502-410-5000​
11SS027-RMS
Mark Drollinger​10/30/2025​California​​818-246-2707
​24MS04-RMS
​Matthew Cuda
5/30/2026​Oregon​​503-880-0126
14SS035-RMS​
​Mazyar Hajiaghai
8/30/2024​California​408-540-4241​
105517-RMP​
Michael Atallah​10/31/2025​​California
​949-756-8282
7SS0011-RMS​
Michael Cantor​4/30/2025​​California
949-275-4950​
23MS071-RMS​
​Michael Liston
10/30/2025​
California​925-808-8197​
​106593-RMP
​Michael Pinkerton
​1/31/2025
California​310-854-6300​
​9SS0030-RMS
Milton Shockley​​9/30/2025
​California
​619-276-5901
12SS002-RMS​
​Murray Harreschou
​2/28/2025
California​​310-396-6532
​110094-RMP
​Oleksandr Zhdanyuk
​10/31/2024
​California
916-206-0829​
​100753-RMP
​Phil Thornberry
​8/31/2025
​Indiana
317-853-2172​
​113725-RMP
​Ramiro Vejar
4/30/2025​​​California
909-333-8592​
​23MS026-RMS
​Randall Wheeler
​5/30/2025
​Wyoming
307-365-8429​
​ZEtwmwJSV8-RMP
​Randolph Brooke
3/19/2026​​California
​209-405-3501
​105251-RMP
Remington Caldwell​5/31/2025​California​​510-557-0592
​1005​​19-RMP​
​ReveAnn Ellrot
​11/30/2025
​California
​805-732-1272​
101101-RMP​
​Rich Davis
5/31/2025​​Wahington
​253-569-8572
23MS093-RMP
Rob Rosengarten​​12/30/2024
Illinois​​630-246-0745
112099-RMP​
Robert Hodges​4/30/2025​Colorado​​309-231-8223
105226-RMP​
Ronald Mason​3/31/2025​California​​650-569-4020
23MT044-RMT​
Shawn Mc Williams​​11/30/2025
​California
702-217-9794​
​113872-RMP
​Stephanie Grandstaff
​7/31/2025
Florida​​813-244-8283
​15SS050-RMS
Steve Vaughn​​8/30/2025
​California
310-930-3355​
105129-RMP​
​Steve Zilolich
​10/31/2024
​California
707-239-2601​
​109217-RMP
​Tanya Laurent
​6/30/2025
California​​310-990-7102
​104667-RMP
​Tim Utterback
​1/31/2026
California​​510-450-6193
​114256-RMP
Tony Midmore​​3/31/2026
Nevada​775-323-1117​
​110443-RMP
Tracy Huchingson​8/31/2025​California​​805-908-9274
​108599-RMP
Tucker Kalman​​4/30/2026
​California
415-723-0962​
​111818-RMP
​Vanessa Calder
​1/31/2025
​California
​916-751-9568
22SS005-RMS​
William Kading​
​2/28/2026
California​951-300-8396​
​110037-RMP
William Mayes​​8/31/2024
​California
​559-214-1070
​​109158-RMP
Winifred Heuvront​​4/30/2025
​Kentucky
502-410-5000​

​Mitigators

​The mitigators listed below have met their board requirements and have met specific CA Contractors License requirements. They are certified to operate in California.

LIST OF CONTRACTORS

MITIGATION CERTIFICATE #

​EXPIRATION DA​TE

CONTACT INFORMATION

CA CONTRACTOR LICENSE #

​Fred Ellrott
​101023
11/30/2025​​805-732-2476
​612436
​Peter Mandel
​104696
​02/28/2025
​510-300-7500
​839709
​Norman Denny
​106142
​08/31/2025
​775-691-7101
​241944
​Jordan Heichman
​106156
​01/31/2025
​530-621-4052
​816271
​Edward Riley
​​106415
​08/31/2024
​530-583-6653
960994
​Eddie Huchingson
​107621
​03/31/2025
​805-908-9274
​612436
​​Jason Gregory
​1079701
​05/31/2026
​805-244-6687
​843747
John Henderson​​108871
​​12/31/2024
​805-280-6616
​632908

A note about Contractors Licenses: Mitigators must also have a valid California Contractors License in one of a few specific categories. You can look up your contractor’s license here to make sure it meets our requirements.​

Laboratories

The testers listed below have met their board requirements and are certified to operate in California:

Laboratories (PDF)

If someone offers you radon testing or mitigation and they are not on the approved lists here, they may NOT be certified to provide radon services in California.

To confirm a certification, report a problem, or report a business selling radon services without the proper Certification, email the radon program at radonprogram@cdph.ca.gov or call (916) 449-5674.

Any person offering radon testing services, who is not a certified professional, is in violation of CA Health and Safety Code sec 106790. Any test results would be invalid for legal purposes. Violation of this regulation is considered a misdemeanor and the individual may be fined up to $1,000, and their business will reported to the appropriate consumer protection agency or licensing board.

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