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An independent directory built from Pennsylvania DEP certification recordsLists dated Oct 1, 2026 · About our data
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Radon testing & mitigation in Montgomery County, PA

28% of basement tests here came back at or above 4 pCi/L, well below the statewide 37%. That means about one in 4 homes tested needs a fix.

Montgomery County radon test data

Montgomery28%
Statewide37%

Share of basement tests ≥ 4 pCi/L

2.4median basement pCi/L
296,621basement tests on record
#63of 67 PA counties by share ≥ 4

First floor: 12% of 55,573 tests ≥ 4 pCi/L, median 1.3

Source: computed 2026-10-11 from PA DEP's Radon Test Results, Sept 1986 - Current (data.pa.gov, public domain). Counts tests, not homes: repeat and post-mitigation tests are included. Only a test tells you your home's level.

29 DEP-certified firms have a business address in Montgomery County (8 offer mitigation), with 59 certified individuals between them. Get free quotes

Radon mitigation (reduction systems) (8 firms)

Firms certified to install radon reduction systems. Firms that also test are shown here once.

Yorgey, David

✓ PA DEP certifiedMitigation
Conshohocken1 certified person

Address

Certified individuals

  • Yorgey, David (mitigation #3758)

DEP cert IDs

mitigation #3758

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 510-6762

Accurate Radon Control Inc

✓ PA DEP certifiedMitigationTesting
Green Lane2 certified people

Address

Certified individuals

  • Demar, David (testing #2112, mitigation #2112)
  • Demar, Zachariah (mitigation #7709)

DEP cert IDs

mitigation #2112 · mitigation #2113 · mitigation #7709 · testing #2112

Source: DEP list DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 541-1557

Gentry, Timothy J.

✓ PA DEP certifiedMitigationTesting
Horsham1 certified person

Address

Certified individuals

  • Gentry, Timothy J. (testing #2217, mitigation #2217)

DEP cert IDs

mitigation #2217 · testing #2217

Source: DEP list DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 672-8529

Air Quality Control, Inc.

✓ PA DEP certifiedMitigation
King Of Prussia1 certified person

Address

Certified individuals

  • Burens, Jr., Roger (mitigation #1862)

DEP cert IDs

mitigation #1862

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 239-4212

Airotox

✓ PA DEP certifiedMitigation
Lansdale3 certified people

Address

Certified individuals

  • Achuff, Mark (mitigation #2741)
  • Achuff, Matthew (mitigation #7422)
  • Achuff, Ryan (mitigation #7424)

DEP cert IDs

mitigation #2741 · mitigation #3109 · mitigation #7422 · mitigation #7424

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 247-6869

The Radon Bros

✓ PA DEP certifiedMitigationTesting
Perkiomenville2 certified people

Address

Certified individuals

  • Allen, Brian (testing #3585)
  • Hollingsworth, Thomas (testing #2749, mitigation #2749)

DEP cert IDs

mitigation #2749 · testing #2749 · testing #3585

Source: DEP list DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (484) 460-9697

Radon-Rid LLC

✓ PA DEP certifiedMitigationTesting
Phoenixville1 certified person

Address

Certified individuals

  • Marino, Marc A. (testing #2585, mitigation #2585)

DEP cert IDs

mitigation #2585 · mitigation #2586 · testing #2585

Source: DEP list DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 222-2273

Radon Technology & Enviromental Inc

✓ PA DEP certifiedMitigation
Royersford5 certified people

Address

Certified individuals

  • Carney, Matthew (mitigation #7364)
  • Hadfield, John (mitigation #7627)
  • Kollmeyer, Jr., Bruce (mitigation #3024)
  • Kollmeyer, Shane (mitigation #7441)
  • Kollmeyer, Sr, Bruce (mitigation #7047)

DEP cert IDs

mitigation #1308 · mitigation #3024 · mitigation #7047 · mitigation #7364 · mitigation #7441 · mitigation #7627

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 495-2810

Radon testing (21 firms)

Clerkin, Diane

✓ PA DEP certifiedTesting
Ambler1 certified person

Address

Certified individuals

  • Clerkin, Diane (testing #2247)

DEP cert IDs

testing #2247

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 896-1922

D-Tech Inc

✓ PA DEP certifiedTesting
Blue Bell1 certified person

Address

Certified individuals

  • Notwick, Stephen (testing #8836)

DEP cert IDs

testing #8836

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 233-5888

D-Tech, Inc.

✓ PA DEP certifiedTesting
Blue Bell1 certified person

Address

Certified individuals

  • Kopenhaver, Gregory (testing #1941)

DEP cert IDs

testing #0317 · testing #1941

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 233-5888

Radon Testing Systems

✓ PA DEP certifiedTesting
Collegeville2 certified people

Address

Certified individuals

  • D'Arcy, Christopher (testing #3566)
  • D'Arcy, Thomas (testing #8999)

DEP cert IDs

testing #0794 · testing #3566 · testing #8999

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 968-1933

Radon Testing Systems

⚠ Name may be cut off in DEP records
✓ PA DEP certifiedTesting
Collegeville4 certified people

Address

Certified individuals

  • D'Arcy, Laura (testing #8766)
  • D'Arcy, Michele (testing #8283)
  • Humeas, Joe (testing #8745)
  • Meehan, Michael (testing #8274)

DEP cert IDs

testing #8274 · testing #8283 · testing #8745 · testing #8766

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 968-1933

Coppa, Joseph

✓ PA DEP certifiedTesting
Conshohocken2 certified people

Address

Certified individuals

  • Coppa, Joseph (testing #3619)
  • Mcguinness, Brody (testing #3737)

DEP cert IDs

testing #3619 · testing #3737

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 639-3866

Bancroft, Jason C.

✓ PA DEP certifiedTesting
Gilbertsville1 certified person

Address

Certified individuals

  • Bancroft, Jason C. (testing #2719)

DEP cert IDs

testing #2719

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (484) 504-9876

A1 House Prep, LLC

✓ PA DEP certifiedTesting
Harleysville2 certified people

Address

Certified individuals

  • Johnson, Donna (testing #8641)
  • Johnson, Robert (testing #2427)

DEP cert IDs

testing #2427 · testing #8641

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 853-8226

Musselman Home Ins

⚠ Name may be cut off in DEP records
✓ PA DEP certifiedTesting
Harleysville1 certified person

Address

Certified individuals

  • Miseyko, David (testing #8847)

DEP cert IDs

testing #8847

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (267) 328-4663

Musselman Home Inspection LLC

✓ PA DEP certifiedTesting
Harleysville3 certified people

Address

Certified individuals

  • Millspaugh, Gary (testing #9129)
  • Musselman, Jonathan (testing #2962)
  • Speak, David (testing #8958)

DEP cert IDs

testing #2962 · testing #3381 · testing #8958 · testing #9129

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (267) 328-4663

Hillerby, Dana

✓ PA DEP certifiedTesting
Hatfield1 certified person

Address

Certified individuals

  • Hillerby, Dana (testing #2794)

DEP cert IDs

testing #2794

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (267) 627-2252

First Choice Rn Tes

⚠ Name may be cut off in DEP records
✓ PA DEP certifiedTesting
Huntingdon Valle3 certified people

Address

Certified individuals

  • Hyatt, Anders (testing #8317)
  • Peters, Hans (testing #8235)
  • Synnestvedt, Frank (testing #8253)

DEP cert IDs

testing #8235 · testing #8253 · testing #8317

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 947-1995

Eslinger, Christopher

✓ PA DEP certifiedTesting
Lansdale1 certified person

Address

Certified individuals

  • Eslinger, Christopher (testing #3289)

DEP cert IDs

testing #3289

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (267) 902-6421

Spy Inspection Services, Inc.

✓ PA DEP certifiedTesting
Lansdale6 certified people

Address

Certified individuals

  • Achuff, Mark (testing #8555)
  • Achuff, Matthew (testing #8668)
  • Gallen, Brian (testing #8693)
  • Lendzinski, Adam (testing #9150)
  • Ray, Richard (testing #8339)
  • Ricci, Harvey (testing #2042)

DEP cert IDs

testing #2042 · testing #2043 · testing #8339 · testing #8555 · testing #8668 · testing #8693 · testing #9150

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 362-1234

Fabri, Niko

✓ PA DEP certifiedTesting
Norristown2 certified people

Certified individuals

  • Fabri, Niko (testing #3722)
  • Omar, Aiman (testing #3621)

DEP cert IDs

testing #3621 · testing #3722

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 313-7499

Underwood, Kyle

✓ PA DEP certifiedTesting
Norristown1 certified person

Certified individuals

  • Underwood, Kyle (testing #3195)

DEP cert IDs

testing #3195

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (267) 407-8808

Long, Tyler

✓ PA DEP certifiedTesting
Pennsburg4 certified people

Address

Certified individuals

  • Kurtz, Joshua (testing #3645)
  • Long, Tyler (testing #3351)
  • Mccurry, Justin (testing #3286)
  • Thayer, Benjamin (testing #3574)

DEP cert IDs

testing #3286 · testing #3351 · testing #3574 · testing #3645

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 737-7274

Spotlight Home Inspection LLC

✓ PA DEP certifiedTesting
Perkiomenville2 certified people

Certified individuals

  • Burgess, Randall (testing #3382)
  • Wright, John (testing #8813)

DEP cert IDs

testing #3341 · testing #3382 · testing #8813

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (215) 234-0505

Armored Home Inspections, LLC

✓ PA DEP certifiedTesting
Pottstown3 certified people

Address

Certified individuals

  • Niles, Curtis (testing #2495)
  • Niles, Lori (testing #8542)
  • Niles, Manasseh (testing #9084)

DEP cert IDs

testing #2495 · testing #2496 · testing #8542 · testing #9084

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 352-2212

Labar, John

✓ PA DEP certifiedTesting
Pottstown1 certified person

Address

Certified individuals

  • Labar, John (testing #3178)

DEP cert IDs

testing #3178

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 551-8892

Lennox, Craig

✓ PA DEP certifiedTesting
Trooper1 certified person

Address

Certified individuals

  • Lennox, Craig (testing #2771)

DEP cert IDs

testing #2771

Source: DEP list, retrieved 2026-10-11 · Claim, correct or remove this listing

Call (610) 277-4953

Neighboring counties

Berks (9 firms) · Bucks (19 firms) · Chester (18 firms) · Delaware (12 firms) · Lehigh (11 firms) · Philadelphia (10 firms). Firms often serve across county lines.

Adjacency from U.S. Census Bureau county adjacency file.

City pages & guides

King of Prussia (guide) · Lansdale (guide) · Norristown (guide)

Hiring a radon pro in Montgomery County: quick guide

With 28% of 296,621 basement tests at or above 4 pCi/L (below the 37% statewide share), Montgomery County has 8 DEP-certified mitigation firms based locally.

Detailed local guides: How to find a radon expert in King of Prussia · How to find a radon expert in Lansdale · How to find a radon expert in Norristown

Frequently asked questions

How many certified radon mitigation firms are in Montgomery County?

8 DEP-certified firms offering mitigation and 29 certified radon firms in total list a business address in Montgomery County (PA DEP lists dated 10/01/2026). Firms from neighboring counties may also serve the area.

What share of Montgomery County radon tests are high?

28% of 296,621 basement tests in PA DEP's records were at or above EPA's 4 pCi/L action level, with a median of 2.4 pCi/L.

How much does radon mitigation cost in Montgomery County?

We don't have county-specific price data. A national cost guide reports typical installs at $786-$1,274. Get written quotes from DEP-certified mitigators.

Want firms to contact you?One request to Montgomery mitigatorsRequest quotes