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Black Dog Radon Services Name Change


Black Dog Inspections LLC is DBA Black Dog Radon Services.   Same company just an adjustment of the trade name to what we actually do.  Black Dog Inspections, LLC has always focused on radon products but has been confused with companies of similar names such as Black Dog Home Inspections in Indiana and Black Dog Inspections Inc in Canada.  We do not do home inspections but many of the on line business listings services force us to pick the Home Inspection category since they do not specifcaly call out Radon as a unique catergory it is only defned as a part of someting else.

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Location Change


Black Dog Inspections, LLC has a new Nashua Mailing Address

14 Lynn Street

Nashua, NH 03060


Electronic Radon Gas Detector

RADPRO3 ItemR.jpg

August 28, 2009

Black Dog Inspections, LLC is now offering the Safety Siren PRO Series 3 Radon Gas Detector to the public for $129.95 (shipping included to Cont US).  If you have been a past Black Dog Inspections' customer or are planning on having a Black Dog Inspections radon mitigation system installed, ask for your discount on this product.  The discount only applies to past and present customers.  We have used this product for over a year on site and continually checked it against other passive devices and electronic (CRM) devices during the year and found it to track reasonably close.  We would not offer this product unless we believed it would provide a reasonable benefit to our customers.   Please use the "contact us" page for information on how to get your own detector.

Granite Countertops


August 2008 - I have been getting several calls asking for radon tests in homes with granite countertops based on recent publicly of the possible dangers of radon emission from granite products.

As a certified radon measurement provider, I can provide professional measurements or a specific placement plan to determine what your homes internal radon levels are.  I can also provide real time Geiger Counter type measurements to locate problem areas with a non certified device if you feel a deep concern about the potential problem.  The bottom line is there is not a large scale problem with granite and radon but it is possible to have a granite countertop with higher that expected emissions. 

There are two problems to consider when dealing with granite countertops.  First there is no protocol to determine what level of radon is acceptable and exact method of measuring it.  Second measuring levels of radon in bathrooms or kitchens is not considered a preferred location in the measurement protocol due to potentially high levels of moisture and venting which may yield invalid results.

The EPA recommends that all homes be tested for radon in indoor air.  Additional testing in homes with granite countertops could indicate if excessive levels of radon are present using a reasonable test approach.

Recommendations for using do-it-yourself radon testing:

Radon test kits can be purchased at hardware stores and online.  Make sure they are fresh and use the same type for all your measurements.  Purchase 3 to 4 test devices for this process.  Black Dog Inspections can supply fresh professional quality test kits if you have difficulty in obtaining test devices. 

1                  Place one test in the basement or lowest area in the home to determine if radon is coming from the ground under your slab.  (If a test was performed in the past, the measurements can be compared)

2                  Place another test in a bedroom or family room at the same floor level as the kitchen or the room with granite countertops to establish a background radon level. 

3                  Place one or two tests in the room with granite countertops - put one on the granite surface and if necessary a second one the farther away on the counter for larger counter surfaces.

For the best results you should avoid using the room with the granite countertops (cooking, venting, and water use) since this may cause false readings during the test time.

Look at the results.  The lower level test is usually 2 times the floor above.  If there is a great difference between the counter top room and the non countertop room on the same floor level, the counters may be the contributors as long as the radon in water level has been determined not to be a contributor.  If you are on public water or not on a deep well, radon in water should not be factor.    

Remember passive test devices test for radon, not other radiation.  If there is a large difference between the kitchen floor measurements, professional assistance may be your next step.  If the test measurements are similar and much less than the lower level measurements, your counters are not a problem.

Names of qualified professionals who conduct radon and radiation testing can be located at


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