Checklist for Hiring a PA DEP-Certified Radon Contractor

Pennsylvania regulates who can legally perform radon testing and mitigation work for hire. This is not a courtesy license, it is a real requirement. That means the certification step is not optional if you want the work done correctly and legally in York, PA.

A company can advertise radon services without being certified for mitigation specifically, so it is on you to verify the actual status rather than taking a website claim at face value.

Before you do anything else, search the PA DEP Radon Services Directory. This is the state's list of certified testers and mitigators. Start here, not with a general contractor search or a name a neighbor mentioned in passing.

The directory exists specifically to help homeowners confirm who is qualified to do this work in the state. Certification status can change, so checking the current directory matters more than a company's own site or a review page.

A certified mitigator should be able to explain why they recommend a specific system design for your foundation, not just quote a flat price over the phone. Ask:

• Are you PA DEP-certified for mitigation specifically, and what is your certification ID?
• What system type are you recommending for my foundation, and why?
• What warranty covers the fan, and how long does it last?
• Is post-installation retesting included, or billed separately?
• Can I get a written scope of work with a clear total price?

A legitimate mitigator does not need to close you on the spot. Watch for pressure tactics and uncertified operators:

• Same-day signing pressure or refusal to put a scope in writing.
• A quote that is suspiciously low, which can mean a single suction point where your home needs two.
• Vague final cost language, like a final cost may vary with no defined ceiling.
• A contractor who will not let you verify their certification in the PA DEP directory.

Any of these is a reason to walk, not a reason to hurry.

Run through this list before committing to anything:

• Confirmed the contractor's name matches an active certification in the PA DEP directory.
• Received a written scope of work describing the exact system, not a verbal estimate.
• Asked what warranty covers the fan and how long it lasts.
• Confirmed post-installation retesting is included, not billed separately later.
• Have a clear total price in writing, with no vague final cost may vary language.

The cheapest bid on paper is not always the correct design for your foundation. A low number sometimes means a single suction point where your home actually needs two, or routing choices that look clean but do not pull air evenly from under the slab. The right system matches the suction layout to how air moves beneath your specific home, which is exactly what certification is meant to ensure.