How mold is removed after water damage, what Pennsylvania law does and does not require, and what to ask any company.
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Mold remediation removes or cleans mold-affected material, fixes the moisture behind it and checks that the area is dry. Pennsylvania does not license mold remediators the way some states do, so industry guidance such as IICRC S520 and EPA guidance applies. Ask any company about its process, training and written scope before work starts.
Mold needs moisture, food and time, and a house that has been wet has all three. Cellar walls, paper-faced drywall, wood framing, cardboard and carpet pad give it plenty of food, and a closed cellar in a humid summer gives it the moisture. That is why a slow leak, a damp stone wall or a flood that was never fully dried can come back as a mold job later.
The most useful thing to know first is that mold remediation here is not a licensed trade. Pennsylvania does not license mold inspectors or remediators the way some states do, and the EPA does not regulate mold either; it publishes guidance. What fills the gap is industry practice, principally the ANSI/IICRC S520 standard, and your own questions.
This page explains what remediation involves, what the law actually says in Pennsylvania, and what to ask before you hire anyone, including the company behind this site. If you are not sure whether you have a mold problem, the mold inspection page is the place to start.
Pennsylvania has no state license for mold inspection or mold remediation, according to secondary sources, and the EPA does not regulate mold. Home improvement contractors must register with the Attorney General, and written contracts are required for jobs over $500. IICRC S520 and EPA guidance are the practical standards.
This is the part that surprises people. In some states a remediator must hold a state license; Pennsylvania does not license the trade. The registration that does apply is the home improvement one, which the Attorney General's office runs, and repair work after mold removal, such as drywall and flooring, falls within that law.
Because the license statement rests on secondary sources, confirm it if it matters for your decision, for example with the Attorney General's office. Do not accept anyone's claim to be state-licensed for mold in Pennsylvania.
ANSI/IICRC S520 is the industry standard for professional mold remediation, published by the Institute of Inspection, Cleaning and Restoration Certification, a non-government body. The EPA's guide to mold, moisture and your home gives the 24 to 48 hour drying advice and the 10-square-foot rule. Neither is a license.
IICRC certifies individual technicians, for example as Applied Microbial Remediation Technicians, and companies can become certified firms. You can ask any company which certifications its technicians hold, and ask for proof.
Nothing on this site claims that the business or its technicians hold any certification. Ask the company that calls you.
Ask for the written scope, the containment plan, the technicians' training, the Pennsylvania home improvement registration number, proof of insurance, how the company will confirm the work is complete and whether it also does the testing. A company that will not put these in writing is a warning sign.
Ask whether the same company will test and remediate. Many people prefer an independent inspector to check the work, because the party that does the work should not be the only one to say it is done.
Ask what will be done about the moisture source, and who is responsible for that. A cleanup that leaves the leak is a short-term fix.
Mold can trigger allergy and asthma symptoms in some people, and it damages materials. The CDC says the term toxic mold is inaccurate, and no one can tell you from a glance what a particular patch will do. Dry the area, fix the moisture and clean or remove affected material.
People with asthma, allergies or weak immune systems should stay out of the work area, and anyone with symptoms should speak to a doctor.
Avoid fear-based sales. Reliable guidance focuses on fixing moisture and removing growth, not on dramatic claims.
Do not mix bleach with other cleaners, do not dry-sand or dry-scrub moldy drywall, and do not disturb a large patch without a mask suited to the job. Keep children and anyone with asthma out of the area.
Mold comes back if the water does. The source, whether a leak, seepage or condensation, has to be identified and a plumber or other contractor engaged to fix it before the cleanup is worth doing.
A good remediator walks the area, photographs it and writes down what will be cleaned, what will be removed and how the area will be contained. Ask to see it, and ask what the test for completion will be.
Plastic sheeting and, for larger areas, negative air pressure with HEPA filtration keep spores from drifting into the rest of the house. Containment is why professional work costs more than scrubbing.
Porous materials with growth, such as drywall, insulation and carpet, are removed and bagged. Hard surfaces and framing are cleaned by HEPA vacuuming, wire brushing or sanding and wiping, depending on the material.
The area is dried to a dry reference reading, and the crew checks that no visible growth or musty smell remains. Some jobs end with a post-remediation check by an independent party.
Drywall, trim and paint go on after readings confirm dryness. Rebuilding early over damp framing is how mold returns.
The EPA says an area smaller than about 10 square feet, roughly 3 feet by 3 feet, can usually be cleaned by the homeowner on non-porous surfaces, using gloves, goggles and a mask suited to the job. The moisture still has to be fixed.
Growth across larger areas, in carpet, insulation or drywall, calls for professional help. Material that cannot be cleaned is removed, with containment so that spores do not spread.
The EPA says sewage-related mold and mold in HVAC systems call for professional help. If the growth followed a backup, the sewage cleanup page covers the first stage.
Remediation costs depend on area, material and containment. Published cost guides report both a per-square-foot range and a wide total, and the actual figure depends on the job.
| Job | Typical range | What it includes |
|---|---|---|
| Mold remediation, per sq ft, per HomeAdvisor and Angi | about $10–$25 | As cost guides report it |
| Typical total job, per cost guides | $1,223–$3,756 | Average reported near $2,368 |
| Extensive cases, per cost guides | up to about $20,000 | Whole-floor or structural cases |
| Antimicrobial application, per sq ft | $0.50–$2.00 | Working estimate |
| Drywall replacement, per sq ft | $3–$7 | Working estimate, quoted after drying |
The first three rows are what cost guides report and the last two are the business's own working estimates for Montgomery County in 2026. None of it is a quote. The scope and price are confirmed in writing on site before work starts.
Tell us what's happening and we'll tell you honestly whether it's a quick fix, and what mold remediation should cost.
In Jenkintown's older twins and rowhouses, mold usually follows water: a burst line behind plaster, a wall that weeps after long rain or a cellar that stayed damp after a storm. Summers here are humid, and a closed cellar traps that moisture against cold stone.
Stone and brick cellars are slow to dry, which is why a crew checks them repeatedly. Wood framing, stored boxes and paneling built against a stone wall are the usual places growth starts.
A Pennsylvania home improvement contractor must register with the Attorney General, and you can look up a contractor's registration on its website. Ask for the number in writing.
What a mold inspection includes, what air and surface tests do, and how to vet an inspector in a state with no mold license.
Monitored drying of plaster-and-lath walls, hardwood over joists and stone or brick, with daily readings until dry.
Cleanup and drying for older cellars where water weeps through the face of rubble stone walls rather than through a crack.
How a wet house gets from first call to dry, repaired rooms, and which page to read for your kind of water.
Not sure if you're covered? Check your ZIP code.
A sewer backup pushes wastewater up through a floor drain, toilet or basement fixture, and it is Category 3 water.
Pennsylvania does not issue a general contractor license.
No. Pennsylvania does not license mold inspectors or remediators the way some states do. Home improvement contractors register with the Attorney General, and industry guidance such as IICRC S520 and EPA guidance applies. Ask any company about its training.
A small patch of about 10 square feet or less on a hard surface can usually be cleaned by the homeowner, per the EPA. Larger areas, porous materials, sewage-related mold and mold in heating systems need professional help.
Bleach can whiten the surface of non-porous material but does not solve the moisture. On porous materials it can leave roots. Removing growth and drying the area is the aim, and mixing bleach with other cleaners is dangerous.
It depends on the cause and your policy. Mold from a sudden covered loss may be treated differently from mold from a long-term leak. Your insurer decides, so read the policy and ask your agent.
A small area may take a day or two. Larger jobs with containment and drying take longer, and rebuilding comes after drying. The written scope should give an estimate.
It will if the moisture does. Fixing the leak or the seepage, drying thoroughly and keeping humidity down are what keep it away.