Pennsylvania Inspectors Find Local Inspection Services

Best Radon Testing in Union County, PA

Compare 10 local radon testing providers in Union County. Verified listings with real contact info.

10 verified providers · Updated 2026-03-29

Quick Compare

1

Domestic Radon Testing

Call
2

Radon Guys, LLC

5.0 ★ (4 reviews)

Call
3

Water Guard Innovations LLC

5.0 ★ (1 reviews)

Call
1

Domestic Radon Testing

508 Green St, Mifflinburg, PA 17844
2

Radon Guys, LLC

5.0 (4 reviews)
714 Bowersox Rd, Middleburg, PA 17842
Mon–Thu 9:30am–5:30pm · Fri–Sun Closed
3

Water Guard Innovations LLC

5.0 (1 reviews)
1070 Penn St, Milton, PA 17847
Open 24 Hours
4

CSI Inspections LLC

4.8 (25 reviews)
Queen St, Northumberland, PA 17857
Mon–Fri 8am–6pm · Sat–Sun 24hrs
5

JCN Radon Services, Inc.

5.0 (1 reviews)
1911 Poco Farm Rd, Williamsport, PA 17701
Mon Closed · Tue–Sat 8am–5pm · Sun Closed
6

West Branch Inspections, LLC

5.0 (212 reviews)
Round Top Rd, Montoursville, PA 17754
Mon–Fri 8am–5pm · Sat–Sun Closed
7

PA Radon Solutions

5.0 (5 reviews)
420 Valley Rd, Bloomsburg, PA 17815
Mon–Fri 8am–4pm · Sat–Sun 7am–5pm
8

Rock House Inspections

5.0 (292 reviews)
203 Hogs Back Rd, Millville, PA 17846
Mon–Fri 9am–5pm · Sat–Sun Closed
9

Oak Leaf Environmental

5.0 (46 reviews)
409 S Pennsylvania Ave Suite 100, Centre Hall, PA 16828
Mon–Fri 7:30am–5pm · Sat–Sun Closed
10

McKee Environmental

5.0 (40 reviews)
86 Quartz Dr, Bellefonte, PA 16823
Mon–Sun 7am–7pm

Frequently Asked Questions

How much does radon testing cost in Pennsylvania?

Professional radon testing in Pennsylvania typically costs $150 to $300. Short-term tests (48 hours) are standard for real estate transactions. Long-term tests (90+ days) provide a more accurate annual average. The PA DEP also offers free DIY radon test kits to Pennsylvania residents through their website.

Why is radon testing so important in Pennsylvania?

Pennsylvania has some of the highest indoor radon levels in the United States. The PA DEP estimates that about 40% of homes exceed the EPA's recommended action level of 4 pCi/L. Every county in the state has homes with elevated radon. The PA DEP and EPA strongly recommend testing every home, regardless of location.

Are radon testers required to be certified in Pennsylvania?

Yes, Pennsylvania requires radon testers to be certified by the PA DEP under the Radon Certification Act. Certified testers must complete approved training, pass an exam, and follow PA DEP testing protocols. For real estate transactions, only a PA DEP-certified tester's results are accepted by lenders.

What happens if my home has high radon levels?

If radon levels exceed 4 pCi/L, the EPA recommends installing a radon mitigation system. The most common approach is sub-slab depressurization, which uses a fan and pipe to vent radon from beneath the foundation to the outside. Mitigation in Pennsylvania typically costs $800 to $1,500 and reduces radon levels by up to 99%.

When should I test for radon in Pennsylvania?

Test when buying or selling a home, after major renovations that alter the foundation, if you've never tested, or if your last test was more than 2 years ago. Testing is best done during the heating season (October through March) when windows are typically closed and radon levels tend to be highest.

Related Services in Union County

All services in Union County, PA →