Found Mold in Your Maine Home or Rental? Start Here

You pulled something away from the basement wall and there it is. Or a tenant sent a photo of a bathroom ceiling and now you have to decide what to do about it before Monday. Either way, the first hour of a mold problem is usually spent on the wrong question.

The wrong question is “how bad is this.” The right one is “where is the water coming from,” because until that is answered, anything you clean is going to come back.

First, find out whether you even need a contractor

This is the part nobody selling remediation leads with, so we will. The EPA’s position is that if the moldy area is less than about 10 square feet, roughly a 3 foot by 3 foot patch, in most cases you can handle the cleanup yourself.

Growth on the grout behind a shower, or a windowsill where condensation sat all winter, is usually in that category. Scrub it, dry the area completely, then fix whatever kept it wet. Porous material is the exception. Drywall, insulation, carpet padding and ceiling tile that have absorbed water do not clean, they get removed.

Bigger than that patch, water from sewage, growth inside a wall cavity or the HVAC system, or someone in the building with asthma or a compromised immune system: those are the times to bring someone in.

The 24 to 48 hour number

Keep this one. EPA’s guidance is that if wet or damp materials are dried within 24 to 48 hours of a leak or spill, in most cases mold will not grow at all.

That window separates a fan and a wet vac from a remediation contract. It is why the supply line that let go on a Saturday morning while you were home is a small repair, and the identical failure the day before a two week trip takes out a wall. If you own rental property, a policy that gets air moving on a wet floor the same day it is reported will save you more than any other line in your budget.

Before you hire anyone in Maine, know this

Here is something most Maine property owners find out the hard way. Maine has no contractor license for mold remediation itself. What Maine does license, through its Board of Pesticides Control, is the application of antimicrobial and biocide products in this work — including a category written specifically for it: 7C3, Mold Remediation & Water Damage Restoration. So when a company tells you it is “licensed and certified” for mold, ask which license they mean. If it is not a Maine pesticide applicator license, the state does not issue it — and if it is, you can check it in a minute.

There is a real credential, and you can check it in a minute.

The Maine Indoor Air Quality Council states it plainly: if you hire someone to clean mold for you, they must be a licensed Maine pesticide applicator in order to use any chemical, including bleach, to clean, control, or kill mold.

Including bleach. That catches a lot of operations that would never think of themselves as a pesticide company. Ask any contractor you are considering for their pesticide applicator licence number, then check it against the Maine Board of Pesticides Control’s public list of licensed commercial applicators. It is searchable by company name, licence number and expiration date. If they intend to use a chemical and cannot produce a licence, you have your answer.

Everything else is voluntary certification. Not worthless, but ask which certification, issued by whom, and current through what date, rather than accepting “certified” as a category.

Four questions worth asking before you sign

What is the moisture source, and who is fixing it? EPA is direct that mold indoors is controlled by controlling moisture indoors. Roof leaks and grading or gutters pushing water toward the foundation are the usual culprits, and those are building repairs, not cleaning. If a proposal describes scrubbing and never names the water, you are buying a repeat visit.

Do we actually need testing? EPA says that in most cases, if visible mold growth is present, sampling is unnecessary. Testing earns its cost in specific situations, such as a dispute where you need documentation, a complaint with no visible growth, or verifying a completed job. Paying to confirm what everyone can already see is a line item, not information.

What is coming out, and what is staying? Get the affected materials named in writing. “Treat the basement” is not a scope. “Remove and replace the lower 24 inches of drywall and the insulation behind it on the north wall” is.

What happens to the humidity after you leave? EPA’s target is below 60 percent relative humidity, ideally 30 to 50 percent. A basement that runs at 70 percent through August will grow mold again no matter how well it was cleaned. If the proposal stops at cleanup, it is half a plan.

If you are a landlord

Two things protect you. Document the report and your response with dates, photos and what you did, starting the day the tenant tells you. And communicate what is happening in writing, including when the space will be usable again. Most mold disputes between owners and tenants are not really about the mold, they are about the weeks where nobody said anything.

Maine’s seasons drive this. Spring thaw and summer humidity load basements and crawlspaces, fall condensation collects on cold surfaces, and winter ice dams push water into wall cavities nobody sees until spring. A problem you find in April often started in January.

If you want a second opinion

Use everything above and hire whoever you like. If you would rather have someone look first, we offer a free assessment. You can also see what mold remediation typically costs in Maine, watch our FAQ videos if you want to understand the process before anyone walks through your door, or read about how we work in Gorham and the Greater Portland area.