Radon-only contractor in Springettsbury Township, York, founded in 1999. Installs radon mitigation systems, replaces radon fans, runs 48-hour continuous-monitor tests and seals sump pits. Listed as a certified mitigation firm (firm ID 1966) on the Pennsylvania DEP List of Certified Mitigation Firms dated 1 September 2026, and serves York County including York, Dover, Dallastown, Red Lion, Shrewsbury, Hanover and New Freedom.

Lancaster home inspection company that also performs radon testing and installs radon mitigation systems. Its radon page says it serves York, Lebanon, Berks, Dauphin and Adams Counties as well as Lancaster, and names Harrisburg, York, Elizabethtown and Ephrata. States it is DEP certified for radon mitigation.

Camp Hill radon mitigation contractor operating since 1991. Installs mitigation systems, does radon-resistant new-construction work and installs sump pumps. Its site gives a service area of 60 miles around Harrisburg, which takes in all of York County, Lancaster and Gettysburg, and prints DEP certification numbers 1418 and 1419.

Radon mitigation installer in Wellsville, north-western York County, run by Bob Meyer, who has installed residential systems since 1997 as well as commercial and multi-family systems. Every proposal includes a post-mitigation test device, and the company arranges certified testing for real-estate transactions. Serves south-central Pennsylvania; DEP-certified mitigator #1800.

Harrisburg home inspection and radon company that installs radon mitigation systems and performs residential and commercial radon testing, alongside mold, water and sewer-scope inspections. Its York service page names York, Hanover, Dover, Wrightsville, Manchester, Lancaster, Gettysburg, Carlisle and other towns within about an hour of Harrisburg. DEP certifications #1512 (testing) and #1725 (mitigation) are printed on the site.

Veteran-owned home and commercial inspection company on Eastern Boulevard in York, in business since 1993. Offers radon testing with results in 48 hours, plus septic, mold, water and termite inspections and sewer scopes, across central Pennsylvania and northern Maryland. Appears on the DEP certified-tester list. Testing only; it does not install systems.

Home inspection company working in Pennsylvania and Maryland, listed by the DEP under Red Lion, York County. Offers home, new-construction, commercial and rental inspections plus radon testing, sewer camera, mold sampling, water testing and lead paint inspections. Inspector holds DEP radon tester certification #3674. Testing only.

Lancaster home inspection firm offering radon testing, radon mitigation system inspection, water testing (including a lab test for radon in well water), wood-destroying insect inspections, mold sampling and thermal imaging. Serves the greater Lancaster, Lebanon, York, Dauphin and Chester County area including Harrisburg. DEP radon certification #3295 is printed on the site. Testing and inspection only; it does not install systems.

Gettysburg company that has tested for and mitigated radon in south-central Pennsylvania since 1995, reporting more than 9,700 systems installed. Runs continuous-monitor tests for real-estate transactions and designs and installs mitigation systems. States its technicians are DEP certified for testing and mitigation.

National radon company with a south-central Pennsylvania operation and a York service page with a local number. Offers radon testing, mitigation system design and installation, diagnostics and new-construction systems for homes, commercial buildings and real-estate transactions. Its York page says it serves all of York County. Cites NRPP certification and AARST membership; the DEP list shows SWAT of PA as a certified mitigation firm.

York home and commercial inspection company established in 2021. Offers residential and commercial inspections, radon testing, water testing and thermal imaging; the inspector is InterNACHI and CCPIA certified. States DEP radon certification #3493 and a service area of York and Lancaster Counties. Testing only.

Hanover home and commercial inspection and remodelling business run by a second-generation builder licensed in Pennsylvania and Maryland. Performs radon testing alongside pre-purchase, pre-listing and commercial inspections. Prints DEP radon certification DEP3526 and NRPP ID 112405-RMP. Testing only.