Who to Call for Mold: Inspector, Remediator, or Landlord
You found mold, and now you need one phone number, not a research project. The honest answer is that three different people handle mold, and which one you call depends on a single question: do you need someone to find it, someone to remove it, or someone who is legally responsible for it? Call the wrong one and you either overpay or hand the job to a company with a reason to inflate it.
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Start here: three questions that pick the call
Before dialing anyone, answer these:
- Do you rent? Call the landlord or property manager first, in writing. Do not hire anyone yet.
- Is the visible patch smaller than about 10 square feet (roughly a 3-by-3-foot area) on a hard surface? You can likely clean it yourself.
- Is it bigger, hidden, recurring, or tied to sewage or flood water? Call an independent mold assessor first, then a remediation contractor.
That 10-square-foot line is not arbitrary. The EPA’s mold cleanup guidance tells homeowners they can generally handle mold covering less than about 10 square feet themselves; above that, the agency points to its commercial remediation guidance and suggests considering a professional.
The mold assessor (the “find it” call)
An independent mold inspector or indoor environmental professional diagnoses the problem. They do a visual inspection, use a moisture meter and sometimes a borescope to locate hidden growth behind walls or under flooring, and, when useful, collect samples for a lab. Their product is a written report and a scope of work, not a cleanup crew.
The reason to make this your first paid call on a larger job is independence. A firm that only assesses has no reason to find more mold than exists, because it earns nothing from the removal. That matters because the EPA does not recommend routine air or surface sampling as a first step at all: as its brief guide to mold, moisture and your home notes, there are no federal standards for acceptable airborne mold levels, so a number on a lab report means little without a trained interpreter and a matching outdoor comparison sample. You are paying an assessor for judgment, not for a printout. If you want to line one up, the guide on finding a mold inspector walks through vetting, and inspection versus testing explains why the two are not the same purchase.
The remediation contractor (the “remove it” call)
The remediation contractor does the physical work. For anything past a small patch, that means sealing the area with negative-pressure containment, running HEPA air scrubbers, cutting out and bagging contaminated porous materials like drywall and carpet, HEPA-vacuuming and wiping salvageable surfaces, and drying everything. Critically, a competent contractor confirms the water source is fixed before any rebuilding. The CDC’s cleanup recommendations stress the same point: if you do not correct the moisture problem, the mold comes back regardless of how well the surface was cleaned.
Note that spraying bleach or a “fogging” treatment over porous material is not remediation. Colonized drywall, insulation, and carpet get removed, not painted over. See cleaning mold on porous surfaces for why. If ductwork is involved, treat it as its own scope, covered in HVAC mold remediation.
The landlord (the “not your bill” call)
If you rent, the mold is generally your landlord’s problem to address, because most jurisdictions place the duty to maintain a habitable unit on the property owner. Report it in writing (email counts), attach dated photos, describe the location and any water source, and keep every copy. If the landlord does not act, your next contact is your local health or building department, not a private remediation company you would be paying for out of pocket.
Why not just call one company that does both?
You can, and for a small job it is fine. On a large one, a company that both diagnoses and sells the removal has a built-in conflict: the same visit that “finds” the mold also quotes the cure. The classic red flag is a “free mold inspection” that ends in an expensive same-day removal contract. Separating the two calls, an independent assessor to scope it and verify the result, a separate contractor to do the work, costs a little more up front and routinely saves far more on jobs where the scope is genuinely in question.
Credentials to check before you hire
Most states, Colorado included, do not license mold work, so credentials are a filter rather than a guarantee. Two names recur:
- IICRC (Institute of Inspection, Cleaning and Restoration Certification) writes the widely referenced S520 remediation standard and trains removal technicians. Ask a contractor whether they follow S520.
- ACAC (American Council for Accredited Certification) certifies indoor environmental professionals such as the Council-certified Microbial Consultant, the assessment side.
Pair either with references and a written scope. In Colorado specifically, because there is no state mold license to fall back on, that vetting does more of the work than a credential alone.
What each call roughly costs
An independent inspection with limited sampling is the smallest expense and the smartest first spend when the situation is uncertain; the mold inspection cost breakdown covers the ranges. Remediation scales steeply with the affected area, the materials, and whether contaminated water is involved, so compare bids on method, containment, material removal, and source repair, not on price alone. Post-remediation verification is a small add-on that protects the far larger remediation bill by confirming the work succeeded.
Who pays
For homeowners, insurance is more likely to respond when mold follows a sudden, accidental event like a burst pipe than when it grows from a slow leak or chronic humidity, which most policies exclude. Document the cause and extent with dated photos before anything is torn out. For renters, the written report to the landlord is what protects you. An independent assessment supports either path, because it records extent and cause without a stake in the removal.
Frequently asked questions
Should I call an inspector or a remediation company first?
For most homeowners with a larger or uncertain problem, an independent assessor first. They diagnose without a financial stake in the cleanup, which avoids the conflict that arises when one company both finds and sells the removal. For a small, visible patch under about 10 square feet, you may not need either.
What if I rent and find mold?
Report it to your landlord in writing before hiring anyone, since landlords generally carry the duty to keep the unit habitable. Attach dated photos, and contact your local health or building department if the landlord does not respond.
Do I really need mold testing?
Often no. If you can see mold, the EPA and CDC agree the fix is the same regardless of species: remove it and correct the moisture. Testing earns its cost mainly when growth is suspected but hidden, when you need documentation for a claim or dispute, or to verify a completed remediation against an outdoor baseline.
Is black mold a different emergency?
No. Health agencies do not treat “black mold” as a distinct category requiring different removal, a point reflected in the NIEHS overview of mold and health. Any indoor mold growth should be cleaned and its moisture source fixed; the color does not change the response.
For the full sequence, from assessment to removal to verification, the mold inspection and testing hub lays out who to call at each stage. This page reflects EPA, CDC, and Colorado guidance current in 2026 and is informational only; consult a physician about symptoms and a qualified professional before testing or removal. On the Front Range and want an unbiased look before any removal company gets involved? Reach us through the contact page.