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Radon testing & mitigation in King of Prussia, PA

King of Prussia sits in Montgomery County. In the PA DEP test dataset, 6,855 basement radon tests carry a King of Prussia address. Their median was 1.9 pCi/L, and 21% came in at or above EPA's 4 pCi/L action level. Across all of Montgomery County it was 28%, and statewide 37%. Even where the average is lower, neighboring houses can test very differently, so every home should be tested.

King of Prussia radon test data

King of Prussia21%
Montgomery Co.28%
Statewide37%

Share of basement tests ≥ 4 pCi/L

1.9median pCi/L
6,855tests on record
1firms based here

City figures come from the municipality / mailing-address name in PA DEP's Radon Test Results (computed 2026-10-11). They count tests, not homes.

Below are the PA DEP-certified firms with a business address in King of Prussia, then other firms in Montgomery County, then mitigation firms in the counties next door. Certified pros often travel, so ask each one whether they cover your street.

Read the King of Prussia radon hiring guide → (how to verify certification, questions to ask, costs, FAQ)

Firms based in King of Prussia (1)

Radon mitigation (reduction systems) (1 firm)

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

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

Elsewhere in Montgomery County (28)

Radon mitigation (reduction systems) (7 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

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

Mitigation firms in neighboring counties (18)

Podolecki, Piotr

✓ PA DEP certifiedMitigationBerks County
Alburtis1 certified person

Address

Certified individuals

  • Podolecki, Piotr (mitigation #2885)

DEP cert IDs

mitigation #2885

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

Call (484) 547-3496

Rogers, Keith

✓ PA DEP certifiedMitigationBerks County
Douglassville1 certified person

Address

Certified individuals

  • Rogers, Keith (mitigation #3540)

DEP cert IDs

mitigation #3540

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

Call (610) 575-2775

S. J. Watras Inc

✓ PA DEP certifiedMitigationBerks County
Boyertown1 certified person

Address

Certified individuals

  • Cameron, Paul (mitigation #7579)

DEP cert IDs

mitigation #7579

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

Call (610) 367-5005

S. J. Watras, Inc.

✓ PA DEP certifiedMitigationTestingBerks County
Boyertown3 certified people

Address

Certified individuals

  • Berry, James (mitigation #7580)
  • Watras, Michael (mitigation #7111)
  • Watras, Stanley J. (testing #1056, mitigation #1056)

DEP cert IDs

mitigation #1056 · mitigation #1057 · mitigation #7111 · mitigation #7580 · testing #1056 · testing #1057

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

Call (610) 367-5005

Indoor Air Surgeons, LLC

✓ PA DEP certifiedMitigationBucks County
Bensalem1 certified person

Address

Certified individuals

  • Jackson, Corwin (mitigation #3063)

DEP cert IDs

mitigation #3063 · mitigation #3347

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

Call (215) 239-8628

Insight Property Services

✓ PA DEP certifiedMitigationTestingBucks County
Doylestown1 certified person

Address

Certified individuals

  • Schluth, Edward M. (testing #1990, mitigation #1990)

DEP cert IDs

mitigation #1990 · testing #1990

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

Call (215) 674-1808

The Radon Bros

✓ PA DEP certifiedMitigationTestingBucks County
Quakertown3 certified people

Address

Certified individuals

  • Griffith, Bryan (testing #9106, mitigation #7668)
  • Mcgann, Edward (testing #9104, mitigation #7712)
  • Smith, Jacob (testing #9105)

DEP cert IDs

mitigation #3556 · mitigation #7668 · mitigation #7712 · testing #3714 · testing #9104 · testing #9105 · testing #9106

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

Call (484) 460-9697

The Radon Bros

✓ PA DEP certifiedMitigationBucks County
Quakertown1 certified person

Address

Certified individuals

  • Smith, Jacob (mitigation #7699)

DEP cert IDs

mitigation #7699

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

Call (484) 460-9697

Conrad, Spencer

✓ PA DEP certifiedMitigationTestingChester County
Phoenixville1 certified person

Address

Certified individuals

  • Conrad, Spencer (testing #3020, mitigation #3020)

DEP cert IDs

mitigation #3020 · testing #3020

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

Call (570) 573-8159

Gutridge Inspections

✓ PA DEP certifiedMitigationTestingChester County
Pottstown1 certified person

Address

Certified individuals

  • Gutridge, Charles (testing #2973, mitigation #2973)

DEP cert IDs

mitigation #2973 · testing #2973

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

Call (610) 385-3339

Safe Shelter Environmental

✓ PA DEP certifiedMitigationTestingChester County
West Chester6 certified people

Address

Certified individuals

  • Batten Jr, Joseph (testing #3525, mitigation #3525)
  • Fisicaro, Jesse (mitigation #7713)
  • Fletcher, Steven (mitigation #7715)
  • Grant, Joseph (mitigation #7717)
  • Hughes, Kareem (mitigation #7716)
  • Tavoni, Matthew (mitigation #7714)

DEP cert IDs

mitigation #0207 · mitigation #3525 · mitigation #7713 · mitigation #7714 · mitigation #7715 · mitigation #7716 · mitigation #7717 · testing #0207 · testing #3525

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

Call (610) 594-0350

Olinchak, Gary

✓ PA DEP certifiedMitigationDelaware County
Crum Lynne1 certified person

Address

Certified individuals

  • Olinchak, Gary (mitigation #3003)

DEP cert IDs

mitigation #3003

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

Call (610) 909-4356

Anwar, Waqas

✓ PA DEP certifiedMitigationLehigh County
Allentown1 certified person

Address

Certified individuals

  • Anwar, Waqas (mitigation #3318)

DEP cert IDs

mitigation #3318

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

Call (610) 457-2363

Integra Environmental LLC

✓ PA DEP certifiedMitigationTestingLehigh County
Allentown6 certified people

Address

Certified individuals

  • Dilts, Mark (mitigation #7514)
  • Domingues, Tony (testing #2621, mitigation #2621)
  • Gervasi, Joseph (mitigation #7732)
  • Mccrea,Chris (mitigation #7733)
  • Roque, David (mitigation #7646)
  • Weber,Connor (mitigation #7734)

DEP cert IDs

mitigation #2621 · mitigation #3398 · mitigation #7514 · mitigation #7646 · mitigation #7732 · mitigation #7733 · mitigation #7734 · testing #2621

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

Call (610) 346-8004

Metzger, Dale

✓ PA DEP certifiedMitigationLehigh County
Macungie1 certified person

Address

Certified individuals

  • Metzger, Dale (mitigation #2921)

DEP cert IDs

mitigation #2921

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

Call (484) 903-1182

SWAT Environmental

✓ PA DEP certifiedMitigationLehigh County
Allentown8 certified people

Address

Certified individuals

  • Bird, Dennis (mitigation #7560)
  • Bozek, Joseph (mitigation #7652)
  • Clark-Bailey, Justin (mitigation #3586)
  • Dejesus, Daniel (mitigation #7661)
  • Littlemeyer, William (mitigation #7677)
  • Romagnoli, Jr, Dominic (mitigation #3272)
  • Rowland, Rhadshee (mitigation #7417)
  • Uncapher, Jacob (mitigation #7688)

DEP cert IDs

mitigation #3272 · mitigation #3567 · mitigation #3586 · mitigation #7417 · mitigation #7560 · mitigation #7652 · mitigation #7661 · mitigation #7677 · mitigation #7688

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

Call (610) 674-4421

Rvs Radon Mitigation

⚠ Name may be cut off in DEP records
✓ PA DEP certifiedMitigationPhiladelphia County
Philadelphia1 certified person

Address

  • 294 E Cheltenham Ave, Philadelphia, PA

Certified individuals

  • Tabora, Bryann (mitigation #7735)

DEP cert IDs

mitigation #7735

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

Call (267) 269-5573

Rvs Radon Mitigation, LLC.

✓ PA DEP certifiedMitigationPhiladelphia County
Philadelphia3 certified people

Address

Certified individuals

  • Bastidas, Juan D. (mitigation #7697)
  • Gonzalez, Juan Antonio (mitigation #3458)
  • Tituana, Ivan (mitigation #7725)

DEP cert IDs

mitigation #3458 · mitigation #3594 · mitigation #7697 · mitigation #7725

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

Call (267) 269-5573

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.

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