Radon Mitigation Pros in Houston, TX

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Finding a qualified radon mitigation contractor in Houston shouldn’t take a law degree and three referrals from strangers on Reddit — but here we are. The Houston market is saturated with general HVAC contractors who’ll happily quote you a mitigation system, most of whom have never held an NRPP credential in their lives. This directory cuts through that noise: every pro listed here is verified, credentialed, and actually knows the difference between a passive and active depressurization system.

How to Choose a Radon Mitigation Contractor in Houston

• Demand the credential, not just the claim. Texas has no state-level radon licensing, which means anyone with a fan and a ladder can call themselves a radon contractor. Only hire someone with NRPP or NRSB certification — specifically the Mitigation Specialist designation, not just Measurement. Look them up at nrpp.info before you sign anything.
• Separate your tester from your mitigator. The same company that tests your home has a financial incentive to find a problem. For real-estate transactions especially, hire an independent NRPP-certified measurement professional for the initial test, then bring in a mitigator if results come back above 4 pCi/L.
• Ask about sub-slab diagnostics. A competent contractor will perform a communication test (drilling a small diagnostic hole, inserting a vacuum gauge) before quoting the job. Anyone who skips this step and quotes you a flat rate is guessing.
• Verify the warranty is on paper. Reputable Houston contractors back their systems with a 1–3 year labor warranty and a post-mitigation guarantee that levels will drop below 4 pCi/L — or they come back. Get that in writing, not just a handshake.
• Check for permit history. Most Houston-area jurisdictions require a permit for exterior penetrations. A contractor who suggests skipping the permit is saving themselves time, not you money.

Pro Tip: Harris County sits in EPA Radon Zone 2 (moderate potential), not Zone 1 — but “moderate” doesn’t mean safe. Houston’s clay-heavy soil and slab-on-grade construction can still trap radon, and basement additions or pier-and-beam retrofits change the risk profile significantly. Don’t let a Zone 2 label be the reason you skip a test.

What to Expect

A radon test runs $150–$400 depending on whether you use a short-term charcoal canister or a longer 90-day alpha track test (the latter is more reliable for real-estate purposes). If mitigation is needed, a standard active soil depressurization (ASD) system in a Houston slab home runs $800–$1,500 installed, with most jobs completed in a single day. Follow-up testing 24–48 hours post-install confirms the system is working.

Reality Check: The “cheap” quotes around $600–$700 that show up on general contractor platforms almost always skip the post-mitigation test, use undersized fans, or cut corners on exterior pipe aesthetics — which matters when your HOA has opinions. The $200 you save upfront frequently becomes a $500 callback six months later.

Local Market Overview

Houston’s explosive growth in new construction — particularly master-planned communities in Katy, Sugar Land, and The Woodlands — has created a wave of first-time homebuyers who’ve never thought about radon until their real-estate inspector mentioned it in passing. That demand spike has attracted a lot of unqualified operators into the market; the NRPP credential is the single most reliable filter available to Houston homeowners right now.