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Large-Scale or Commercial Radon Testing

HUD & AARNST Standards

Our inspectors are NRPP certified

From multi-unit residential radon testing to large commercial office spaces, we have you covered!


Radon Bid and design work are available for testing procedures for both HUD and AARNST standards.


We have tested 490-unit apartment buildings and commercial buildings with a basement as large as 95,000 square feet!


When HUD is involved, there are two standards used for large-scale buildings.  At Reliable, we are capable of designing programs to meet both sets of requirements, clearing the way for your HUD financing.

We can help design the testing program and get results quickly, smaller projects can be done with our equipment or we can ramp up to do as much as you need on your schedule by using outside testing equipment and lab.


We have 5 NRPP-listed testers on staff so no project is too big. We do testing in Delaware, Pennsylvania, and Maryland.


Delaware Daycare Radon Testing

All licensed childcare providers in Delaware are required to test for radon at least once every five years between October and March. Childcare facilities must also test within 6 months of renovations, remodeling, and construction. This section is a snippet, for more information on Reliable daycare radon testing, please see a dedicated page here.

Testing Procedure

For a residential building being used for child care, a test should be placed in every room used for child care that is in contact with the ground, or the lowest level used for child care. 

For buildings designed for child care, every classroom on the first floor should be tested. 1/4 of classrooms on a second floor should be tested. 

A short-term radon test must run for at least 48 hours in the test location. During this time windows and doors must be kept shut except for normal exit and entry. 

A qualified radon tester can help you build a procedure to meet all State requirements. The button below is a list of qualified testers in Delaware.

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