Mold Testing in Houston, TX: What to Test, Where to Go, and What It Costs

Houston is one of the most mold-affected cities in the country. A small number of practitioners trained in Dr. Shoemaker's Protocol work in the greater Houston area, but for a metro of 7 million people with this level of mold pressure, specialist supply falls far short of demand.

That gap matters because Houston's 75% average humidity and 52 inches of annual rainfall create constant mold pressure. Hurricane Harvey flooded roughly 79% of surveyed households. Hurricane Beryl drove another mold surge in 2024. Mold growth here isn't hypothetical. It's a pattern. And most people dealing with it don't have a local specialist to turn to.

We built MoldCo to fix that. Start with the $56 Starter Health Panel at any of Houston's 18 LabCorp locations, or the $199 HERTSMI-2 home test that ships to your door. For a broader look at Houston mold risk, see our Houston mold guide.

Most mold tests are a waste of money

That's a strong claim. Here's why we stand behind it.

DIY settle-plate kits (the Petri dishes from hardware stores) capture whatever happens to land on an open dish. Results depend on where you put it, how long it sits out, and what the airflow is doing. They can't identify species or measure concentration. Their recommended 5-minute collection period is also extremely short compared to the longer sampling times professionals use, which means they frequently miss mold that's actually present. A clean plate doesn't mean a clean space.

Spore trap air sampling is more controlled, but it's still a snapshot of one moment. An inspector runs a pump for a few minutes at 3 to 4 feet off the ground, and results shift with HVAC operation, time of day, sampler placement, and outdoor weather conditions (since an outside control sample is typically collected alongside). Spore traps count intact spores under a microscope but don't capture mold fragments at all. They also miss most Stachybotrys and other genera that settle quickly out of the air column. And they can't measure mycotoxins. The CDC reports that people in damp buildings experience respiratory symptoms, worsening asthma, and other health effects. But a single air test can miss the evidence entirely if conditions aren't right during sampling.

Air tests show what's floating at pump height at one moment. Dust DNA tests show what's been accumulating for months.

ERMI and HERTSMI-2 dust DNA testing works differently. ERMI (Environmental Relative Moldiness Index) is a research tool developed by EPA scientists that uses DNA-based analysis (MSQPCR) to measure 36 mold species from settled dust. The original 2007 study analyzed 1,096 U.S. homes to create a standardized moldiness scale. HERTSMI-2 is a focused version scoring 5 species most tied to water-damaged buildings. Scores below 11 suggest the environment is likely safe for sensitive people; above 15, the environment is a real risk.

That accumulated record actually predicts health outcomes. Research published in Nature found ERMI was a stronger predictor of respiratory illness (odds ratio 2.53) than visual home inspection alone (1.33). A $500 inspector walking through your house is less predictive than a dust sample you collect yourself.

"I've worked with MoldCo both as a patient and as someone who has advised and witnessed this company grow from the inside. What they have built is not only impressive, it is truly important. I've had multiple mold exposures over the years, in my own home, in hotels, and in short-term rentals, and MoldCo has been the only team able to give me clear answers, real science, and compassionate support. Their testing process is straightforward, their reports are actionable, and their guidance has genuinely changed the way I understand and manage my health."

• MoldCo patient

Your body keeps its own mold record

Blood biomarker panels measure your inflammatory response to mold exposure. The EPA notes that certain molds produce allergens, irritants, and potentially toxic substances. Our Starter Health Panel tests 3 markers (TGF-beta1, MMP-9, and MSH) that indicate whether your immune system is likely stuck in a chronic inflammatory loop. For deeper context on these markers, see our mold illness testing guide. For HERTSMI-2 and ERMI score interpretation, read our guide to what your mold score means.

A home test tells you if your environment is the source. A blood panel tells you if your body is already reacting. You don't need both to start, but together they answer different questions.

What testing costs (and what you're actually paying for)

Professional mold inspections in Houston run $300 to $600, sometimes over $1,000 for larger homes. That gets you a walk-through and some air samples. We built our pricing around a different idea: lower-risk first steps with real data, no thousands upfront.

• HERTSMI-2 Home Test ($199): Ships to your door. Collect a dust sample, mail it back, get DNA-based results with a health-risk score.
• Starter Health Panel ($56): 3 blood biomarkers drawn at any Houston LabCorp. Ordering these markers individually through retail labs costs significantly more.
• CIRS Health Panel ($299): 7 biomarkers for a more complete inflammatory picture.
• Complete Health Panel ($799): 16 biomarkers including C4a, VEGF, leptin, and cortisol.

All blood panels (Starter, CIRS, Complete, and Genetic Risk Test) require a draw at a LabCorp location. Houston has 18 patient service centers across the metro, from Texas Medical Center and The Heights to Bellaire/Meyerland, Westchase, Energy Corridor, Northwest Houston/Willowbrook, and South Belt/Pearland. Browse all locations at LabCorp's Houston page. You order online, get a lab requisition, visit any location for the draw, and results arrive in 2 to 3 weeks.

"Super smooth experience! I got my lab appointment relatively fast, and there were no complications or friction points. Waited a few days to hear back and MoldCo helped with everything from there!"

• MoldCo patient

"I am so impressed with MoldCo! They answered all my questions in a timely manner and outlined in an easy to read format the process of scheduling with LabCorp. They make the entire process seamless. It is so refreshing to have such a caring and easy experience in the health arena. They are my new standard. I highly recommend MoldCo!"

• MoldCo patient

Hiring a mold inspector in Houston

If you go the professional route, Texas is one of roughly 5 states with mandatory mold licensing. The Texas Department of Licensing and Regulation (TDLR) oversees all mold work under Chapter 1958 of the Occupations Code. As of September 2025, Senate Bill 1255 requires every person doing mold work to hold their own TDLR license.

Look for a Mold Assessment Consultant (MAC) or Mold Assessment Technician (MAT) license. ACAC, NORMI, and IICRC certifications help too. One Texas rule that actually protects consumers: the company that assesses your mold can't be the same one that remediates it. Verify any inspector's license through the TDLR portal before signing anything.

Our $199 HERTSMI-2 home test ships to your door, you collect a dust sample, and results come from an accredited lab. If your score comes back normal, you may not need a professional inspection at all. If it's elevated, the next step is bringing in a licensed mold assessment consultant to locate the source.

Why telehealth fills the gap

Practitioners trained in Dr. Shoemaker's Protocol are scarce in the Houston area relative to the city's mold burden. If you've figured out something is wrong, searching for a specialist who actually knows this protocol can take weeks. That's time you don't get back.

Mold illness diagnosis runs on lab data and biomarker interpretation, not a stethoscope. The science travels fine over a screen. Order labs online, visit any Houston LabCorp, get results reviewed by practitioners who actually know this protocol. Medications ship to your door. The CDC's MMWR report on post-Harvey mold risk documented the dangers of mold exposure during flood cleanup. You don't have to wait for a clean environment to start treatment.

What takes months with local waitlists can start in days. Test, get results, get a plan. Check your eligibility for MoldCo Care.

Frequently asked questions

Is MoldCo available in Houston?

Yes. Texas is a full-service state for MoldCo. Lab testing runs through 18 LabCorp locations across Houston, and medications ship directly to your home. Check your eligibility.

How much does mold testing cost in Houston?

Professional inspections range from $300 to $600, with complex assessments exceeding $1,000. MoldCo's HERTSMI-2 home test is $199 (ships to your door), and the Starter Health Panel is $56 at LabCorp. Both give you data a standard inspection often doesn't.

What are the highest mold-risk areas in Houston?

Meyerland, Kingwood, Clear Lake, the Heights, Greenspoint, and Katy/Barker Cypress each show a different version of the same Houston risk pattern: repeated flooding, storm surge, subsidence, older construction, or persistent moisture pathways. Local history matters because mold risk often follows water history.

Does Texas require mold licensing?

Yes. Texas requires state licensing through the TDLR under Chapter 1958 of the Occupations Code. SB 1255, effective September 2025, requires individual licenses for all mold workers. The company that tests your home can't remediate it (conflict-of-interest rule). Verify any contractor's license through the TDLR portal.

How quickly does mold grow after Houston flooding?

In Houston's 75% average humidity, mold can begin growing within 24 to 48 hours after water intrusion. July averages 30.3 muggy days out of 31, and there's no true mold-safe season here. That's why post-flood testing matters, even if remediation has already been done. For symptoms to watch for, see our mold exposure symptoms guide.

Should I test my home, my body, or both?

They answer different questions. A HERTSMI-2 home test tells you whether your environment has elevated levels of water-damage mold species. A blood panel (like the $56 Starter Panel) measures whether your inflammatory markers are elevated. If your home scores high but your markers are normal, that's useful. If your markers look abnormal but your home looks clean, investigate other exposure sources: workplace, car, other buildings. The combination gives you the most complete picture.

Take action

Test your home

Ship-to-home HERTSMI-2 kits for Houston residents:

• Accredited lab analysis of 5 water-damage mold species
• Expert interpretation included
• Results in 1 to 2 weeks

Order MoldCo Home Test - $199

Check your health

Start with baseline biomarker testing:

• 40-60% below typical lab costs
• Results reviewed by practitioners trained in Dr. Shoemaker's Protocol

Order Starter Panel - $56

Get expert care

Connect with practitioners trained in Dr. Shoemaker's Protocol:

• Telehealth appointments, no travel required
• All care, labs, and medications in one place

Check your eligibility

The goal is a test result you can act on: what the home sample suggests, what it cannot prove, and whether a clinician should evaluate the health side.

Medical disclaimer: This content is for educational purposes only and is not intended as medical advice. Consult a qualified healthcare provider for diagnosis and treatment of any medical condition.