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How to find a radon expert in King of Prussia, PA

King of Prussia tests lower than much of Pennsylvania, with 21% of 6,855 basement tests at or above 4 pCi/L. That still leaves 1,408 tests over the action level, so a low average doesn't clear any single house. That's below Montgomery County as a whole (28%) and below the statewide share (37%). The median King of Prussia result (1.9 pCi/L) is below the 4 pCi/L line. The Montgomery County median is 2.4 pCi/L.

Source: computed 2026-10-11 from PA DEP's Radon Test Results (data.pa.gov, public domain), using tests with a King of Prussia municipality/mailing name. Counts tests, not homes, and includes repeat and post-mitigation tests.

King of Prussia at a glance

King of Prussia21%
Montgomery Co.28%
Statewide37%

Share of basement tests ≥ 4 pCi/L

1.9median pCi/L
6,855tests on record
#30of 33 guide cities

Get free quotes Browse all King of Prussia radon firms · Montgomery County

King of Prussia compared with other PA cities

Among the 33 Pennsylvania cities with guides on Radon Roster, King of Prussia ranks #30 by share of basement tests at or above 4 pCi/L. In Montgomery County, compare it with Lansdale, Norristown. About 1,408 King of Prussia basement tests in DEP's records were at or above 4 pCi/L. A DIY or certified test is cheap insurance even where the average is low.

Nearby city guides: Erie · Norristown · Scranton · Wilkes-Barre

What a typical Pennsylvania radon system install involves

Most systems use active soil depressurization (EPA Consumer's Guide to Radon Reduction). The installer drills a suction point through the basement slab (or seals a crawlspace with a membrane), runs PVC pipe to an inline fan, and vents the exhaust above the roofline. Then they seal major openings and add a pressure gauge. A follow-up test should confirm the level dropped. PA DEP describes the confirm-then-mitigate steps on PA DEP: Radon in the Home.

Radon mitigation cost: what King of Prussia homeowners can expect

ItemTypical range (national)
Mitigation system installed$786-$1,274, average about $1,028 (reported range $395-$2,453)
Professional radon test$150-$800

Source: HomeAdvisor cost guide. These are national figures, not local quotes. Prices depend on foundation type, the number of suction points and pipe routing. Try the estimate tool.

Nearest certified radon firms

Nearest DEP-certified firms: 1 based in King of Prussia (1 mitigation), 28 elsewhere in Montgomery County (7 mitigation), and 18 mitigation firms in neighboring counties.

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

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

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

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

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-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

See all firms near King of Prussia →

Buying or selling in King of Prussia? Radon timing tips

  • Pennsylvania sellers must give buyers a property disclosure statement before an agreement of sale is signed. The Real Estate Commission's minimum form asks whether the seller knows of hazardous substances "including... radon" and whether the property has been tested (49 Pa. Code § 35.335a; 68 Pa.C.S. Chapter 73).
  • Sellers aren't required to test, but must not hide known defects (68 Pa.C.S. § 7308).
  • Real estate radon tests by certified testers follow DEP anti-tampering rules, including a signed non-interference agreement (25 Pa. Code Chapter 240). Book the test early in the inspection contingency window, because short-term tests run at least 2 days plus lab time.
  • If a result is high near closing, ask certified mitigators for written quotes. Buyers and sellers often negotiate who pays for a system.

General information, not legal advice.

How to verify a King of Prussia radon contractor's PA DEP certification

  1. Check the name against DEP's current certified mitigation and testing lists in the PA DEP Radon Services Directory. The lists are updated periodically, and ours were retrieved 2026-10-11.
  2. Ask for the DEP certification number and photo ID. Pennsylvania requires anyone doing radon testing, mitigation or lab work for the public to be DEP-certified (25 Pa. Code Chapter 240).
  3. Still unsure? Call the PA DEP Radon Hotline at 800-237-2366.

Every firm listed for King of Prussia on Radon Roster shows its DEP IDs and a link to the source list.

Questions to ask a mitigator before you sign

  • What warranty covers the fan and the work, and is it transferable if I sell?
  • Will you seal the sump, cracks or floor-wall joints, and is that in the quote?
  • Is a system monitor (manometer or alarm) included so I can see the fan is working?
  • Do you carry liability insurance, and will you put the full scope in writing?
  • What is your PA DEP certification number, and will you show your DEP photo ID? (Certified people must show it on request under 25 Pa. Code Chapter 240.)
  • Will you do diagnostic (sub-slab suction) testing before choosing fan size and suction points?
  • Where will the pipe run (inside or outside), and where will the fan and exhaust go?

Frequently asked questions

How do I find a certified radon expert in King of Prussia, PA?

Use a firm on PA DEP's certified lists. Radon Roster lists 1 DEP-certified firms based in King of Prussia and 28 more in Montgomery County. Confirm any name in the PA DEP Radon Services Directory or call 800-237-2366.

Should I test if King of Prussia has lower radon than other PA towns?

Yes. Even here, 1,408 basement tests in DEP's records were at or above 4 pCi/L. EPA recommends every home be tested.

Is radon common in King of Prussia?

In PA DEP's test records, 21% of 6,855 basement tests with a King of Prussia address were at or above 4 pCi/L (median 1.9 pCi/L). Results vary house to house, so only a test tells you your level.

How much does radon mitigation cost in King of Prussia?

We don't have King of Prussia-specific price data. A national cost guide puts typical installs at $786-$1,274 (average about $1,028). Get written quotes from certified local mitigators.

Do I need a radon test when buying a home in Pennsylvania?

It isn't required by state law. The seller's disclosure form asks about known radon and past testing, and many buyers order a test during the inspection period. Real estate tests by certified testers follow DEP anti-tampering rules.

How long does a radon test take?

Short-term tests run 2 to 7 days. Long-term tests run more than 90 days. PA DEP suggests confirming a high short-term result before deciding on mitigation.

Want firms to contact you?One request to King of Prussia mitigatorsRequest quotes