A buyers guide for radon companies: judging an agency on certification knowledge, inspector referrals, the 4.0 pCi/L threshold, and six questions to ask.
Why a generalist agency struggles with radon testing and mitigation
Radon is a gas nobody can see, smell, or verify on their own. That single fact shapes almost everything about how this business gets marketed, and a generalist agency that treats it like any other home service will miss it entirely. Trust has to be built through a certification, a clear explanation of a number most homeowners have never heard of, and a documented retest, not through a nice looking homepage.
The number that matters is the EPA action level of 4.0 picocuries per liter, written as pCi/L. A homeowner or a home inspector crossing that specific line is what actually triggers a phone call, not a vague feeling that radon might be present. An agency that does not build its pages and ads around that exact threshold is writing generic copy for a business that runs on one very specific number.
There is also a split most outside agencies never notice: a cheap charcoal test kit from a hardware store competes on price with the testing side of this business, but the real work, and the real money, is the licensed sub slab depressurization system, the vent stack, and the in line fan that actually brings a reading down. A homeowner cannot install that themselves. A generalist agency will happily market the test and leave the higher value mitigation job unsold.
Radon programs also work differently across Canada and the United States, and a company that only builds pages and ads around the EPA's own language is speaking past any Canadian homeowner reading the same site. A specialist agency should be comfortable describing the US action level plainly, while noting that Canada sets its own separate guideline, without guessing at a foreign number it has not actually confirmed.
The first qualifying question: how do they handle certification and referrals?
Ask any candidate this directly: what certification do you understand radon companies to need, and does it vary by state? Testing and mitigation sit under proficiency programs like NRPP or NRSB, and several states, including New Jersey, Illinois, and Florida, layer their own licensing on top. An agency that names a single certification as universal has not done its homework, since the real requirement shifts from state to state.
The second part of this question is referrals. Most home inspectors do not carry a radon certification themselves, so they hand the test off, usually to the same two or three companies they already trust. Ask how an agency plans to reach those inspectors and the real estate agents around them, not just homeowners searching on their own. A plan that only talks about paid search is missing half of where this business actually comes from.
A good answer also explains the two very different clocks that start this business: a real estate closing, where a short term test crossing 4.0 can stall or renegotiate a sale, and a homeowner's own long term test or a neighbor's result prompting a call on their own schedule. Those two situations need different messaging and different urgency, and an agency that treats them the same is not paying close attention.
Which channels actually book radon jobs, and in what order
Paid search wins the moment someone is already worried. Google Ads built around phrases like radon testing near me and radon mitigation near me put a company in front of a homeowner or an agent the same night a report comes back elevated, which is exactly when the decision gets made fast.
A tuned Google Business Profile, paired with steady local SEO, earns the map pack spot most homeowners click first, without paying for every click. Because testing volume climbs sharply once houses are sealed for winter, and EPA runs National Radon Action Month every January, a company that has already built its map pack ranking before that season starts wins jobs a competitor still buying ads has to pay for.
AI assistants have started answering questions like who handles radon mitigation near me, so being the name ChatGPT or Gemini surfaces is becoming its own channel, separate from a traditional Google search. A plan that ignores this is leaving a growing share of research to whichever company happens to be cited first.
Reviews close the trust gap that a hidden gas leaves wide open. Because nobody can verify a radon reading themselves, real reviews, a manometer reading proving a fan is actually running, and a documented retest under 4.0 are what convince a worried homeowner to let a crew drill into their foundation. Timing the review request to right after a clean retest, while the relief is still fresh, produces steadier proof than a random request ever will.
A separate set of pages built specifically for inspectors and real estate agents, distinct from the homeowner facing pages, is its own channel worth asking about. Since most inspectors do not carry a radon certification themselves and hand the test off to a company they already trust, a page built to be that trusted resource can route a steady stream of work without a single paid click behind it.
Seasonality, and the real numbers worth asking about
Radon testing rises every winter as houses get sealed for heating season, which is also why the EPA built National Radon Action Month around January. A company that only ramps up marketing once the season is already busy is a season behind. The real planning window is the fall, so rankings and ad accounts are already warm when the calls start.
The number that should matter most to an owner is not test volume. It is how many of those tests turn into a booked mitigation install, since that is where the real revenue sits. A high reading that just sits on someone's desk, while they get a second opinion or let a closing deadline force a rushed decision elsewhere, is a lost job every time it happens.
Ask any agency how they would track that specific handoff, from a positive test result to a scheduled installation. If the answer only covers leads or calls, that is a company measuring activity, not the number that actually pays the bills in this business.
A well kept relationship with even a handful of inspectors and agents can be worth more over a year than a much larger paid budget, since a trusted referral source sends work in bulk rather than one search at a time. A plan that only reports on paid clicks, with no visibility into how many jobs came from a referring partner, is missing where a meaningful share of this business actually originates.
Red flags, and the ownership questions that protect you
Be wary of any agency that promises a specific ranking or a guaranteed number of calls. Nobody honest can promise that in a business this dependent on geography, since demand tracks the local geology far more than it tracks population, and some counties simply have more radon than others.
Confirm separately whether your website, your Google Business Profile, your ad accounts, and your customer list would stay with your company if the relationship ended. A company that builds your site on its own proprietary platform, or runs your Google profile through an account it controls, is setting up a relationship that is painful to leave, which protects its own revenue more than it protects yours.
Watch for anyone who treats a radon company like a generic local business, with no mention of the 4.0 pCi/L threshold, no distinction between short term and long term testing, and no plan for the inspector and agent relationships that feed this industry. That kind of vague, one size fits all pitch is the clearest sign an agency has not actually studied this niche.
Six questions to ask before you sign with anyone
One, what certification do you understand this business to need, and do you know it can vary by state? Two, how would you reach the home inspectors and real estate agents who refer most of this work, not just homeowners searching on their own? Three, how would you track a positive test all the way through to a booked mitigation install, not just a call or a lead? Four, how does your plan change between the fall and winter rush and the slower months? Five, do I keep ownership of my website, my Google Business Profile, my ad accounts, and my customer data? Six, how would you help a worried homeowner understand a 4.0 pCi/L reading well enough to actually book the visit?
Pay attention to how much real detail comes back on these six, not how polished the pitch sounds otherwise. SearchPod happens to be a company built to work in exactly this space, handling the site, the paid ads, the local search work, and the review system that turn a scary number into a booked mitigation job. Our prices are already posted where anyone can check them, every plan runs month to month, and a proposal typically lands within a single business day once you ask through /get-proposal. Judge us against the same six questions you would put to any other radon marketing company.
