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Riverside Home Inspections

Williamsport, Maryland. Laboratory

1 West Virginia state license verified against the West Virginia Office of Environmental Health Services, Radiation, Toxics and Indoor Air Division list, last checked November 3, 2026.

Call Riverside Home Inspections at (301) 491-0565

Credentials

Licenses and certifications

1 credential is on file for this business, exactly as the issuer's list printed it.

These are West Virginia licenses, and the business address is in Maryland.

Radon411 has no Maryland record for this business. Before hiring it for a home in Maryland, check what Maryland asks for. What Maryland requires

West Virginia state license (1)

Issued by the West Virginia Office of Environmental Health Services, Radiation, Toxics and Indoor Air Division, not by NRPP or NRSB. Radon411 last checked the list on November 3, 2026.

LicenseNumberStatus on the listExpiresVerifiedCheck with the issuer
Laboratory licenseNo. RL000228West Virginia Radon LabExpires April 30, 2027Verified November 3, 2026Verify RL000228 with the West Virginia Office of Environmental Health Services, Radiation, Toxics and Indoor Air Division (opens in a new tab)

Licensing in Maryland

Ask Maryland Department of Health what it requires before you hire.

Maryland's radon program, Maryland Department of Health, 1-866-703-3266.

What Maryland requires, in its program’s own words, and how to check a credential

Local radon figures

Radon in Williamsport

Williamsport lies in Washington County, where 56.0% of 1,259 radon tests reported to CDC (2008 to 2017, laboratory) were at or above 4 pCi/L, 32.1 points above Maryland pooled (23.9%), 1st of 19 Maryland counties with 30 or more tests.

Radon test figures for the county Williamsport lies in
CountyTestsAt or above 4 pCi/LMedianMaryland, pooledRank in the stateEPA zone
Washington County1,25956.0%5.2 pCi/L23.9%1 of 19Zone 1

Shares of tests people chose to run and report, by county (2008 to 2017, laboratory); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.

The counties around Williamsport

Around Washington County, where Williamsport lies, the nearest Maryland counties with a CDC figure for 2008 to 2017, laboratory run from 18.0% to 41.9% of tests at or above 4 pCi/L; the closest, Frederick County, is 24 miles away at 28.1%.

The nearest Maryland counties to Washington County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Frederick County24 mi3,93328.1%1.5 pCi/L
Carroll County42 mi3,33441.9%2.8 pCi/L
Montgomery County46 mi10,96918.0%1.3 pCi/L
Allegany County47 mi28635.7%2.7 pCi/L
Howard County53 mi4,54930.8%2.0 pCi/L
Baltimore County63 mi7,70619.1%1.4 pCi/L

Nearby

Radon professionals nearest Williamsport

More radon professionals in WilliamsportMore radon professionals in Maryland

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