Crawlspace Radon Mitigation in York County

The crawlspace method PA DEP rates most effective is submembrane suction: a plastic sheet over the earth floor, with a pipe and fan drawing radon from under it and venting it outdoors. 1 PA DEP-certified mitigation company listed here says on its website that it does crawlspace work.

Which Radon Companies Fix Crawlspaces in York County?

This PA DEP-certified company describes crawlspace radon work as a service. Check where it's based and ask whether it serves your town.

Sorted by number of Google reviews.

Enviroquest Inc

Harrisburg, PA · Serves York County

See Google reviews

PA DEP certificationMitigation #1725 · Testing #1725

Also offers: radon-resistant new construction, post-mitigation re-testing and 2 more

(717) 233-6144

Any certified mitigation company may do crawlspaces even if its website doesn't say so. See all mitigation companies serving York County.

What Is Sub-Membrane Depressurization?

A form of soil suction for crawlspaces. DEP's consumer guide calls it submembrane suction, and says that, properly applied, it's the most effective method for crawlspace houses.

Drawing air straight out of the crawlspace with a fan is a less favored option. To see how the methods compare, read how radon mitigation works.

When Do You Need Crawlspace Radon Mitigation?

When a confirmed test shows 4 pCi/L or more in a house with a crawlspace. A house without a basement can still have high radon, DEP says.

Your radon level

Fix your home if one long-term test or the average of two short-term tests is 4 pCi/L or higher. See what your radon number means.

Test the rooms above

Not the crawlspace. Pennsylvania's rules for certified testers (25 Pa. Code § 240.310) say tests go in the lowest livable level of each part of the house that touches the soil. See how to test.

Mixed foundations

A basement under part of the house and a crawlspace under the rest is common, DEP says, and may need a combination of methods. See sub-slab depressurization.

What Happens When a Crawlspace System Is Installed?

Pennsylvania's mitigation standards (25 Pa. Code § 240.308) set these rules for depressurization systems in homes up to three stories:

Inspect first

A thorough visual inspection of the building before any work starts.

Fan outside the crawlspace

Not in a crawlspace, basement or any indoor spot under heated or cooled rooms, and not below ground or in a window well.

Pipe outlet

The same rules as any depressurization system. See the full outlet rules.

Labels

A system label with the company's name, certification number, phone and install date, plus a "Radon Reduction System" label on exposed pipe on every floor.

Information packet

Fixed to the system: your contracts and warranties, how it works, and what to do if the warning device shows a fault.

Test after

At least 48 hours, starting 24 hours to 30 days after the system is switched on. The installer or a separate certified tester can do it. The report must say whether crawlspace vents were open or closed.

Once it's running: is my radon system working?

What Should You Ask a Crawlspace Radon Company?

Whether they'll draw from under a sheet, what covers the floor, and who does the test after.

What's your PA DEP certification number?

Check it on PA DEP's Radon Services Directory, on the mitigation list.

Under a sheet, or straight from the crawlspace?

DEP rates suction under a sheet above drawing air from the crawlspace itself.

What will cover the floor?

DEP's consumer guide describes a high-density plastic sheet.

Who does the test after, and is it in the price?

The rules require a test, but the installer doesn't have to be the one who does it.

Where will the fan go?

The rules keep it out of the crawlspace.

Do I need more than one method?

If the house also has a basement or slab. DEP says mixed foundations may need a combination.

Comparing quotes: how to choose a mitigation company and what radon mitigation costs.

Common Questions About Crawlspace Radon Mitigation

Can a house with a crawlspace have high radon?

Yes. PA DEP's citizen's guide says any home may have a radon problem, with or without a basement. The only way to know your level is to test.

Can you test for radon in a crawlspace?

Not for a test by a certified tester. Pennsylvania's rules say devices may not be placed in crawlspaces or nooks in the foundation.

Does a crawlspace radon system need a fan?

The method DEP rates most effective uses one. Ventilating the crawlspace without a fan can lower radon in some cases, but pipes and appliances there may then need insulating, and energy costs could rise.

Will a crawlspace radon system raise my energy bills?

It can. DEP's consumer guide says most systems cause some loss of heated or cooled air, and a fan slightly increases your electric bill. Drawing air straight out of the crawlspace may also raise energy costs.

Sources

Page last updated Oct 2026.