Crawl space mold and musty smell

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Fix the moisture first

The EPA's guide is blunt: the key to mold control is moisture control. If the crawl space stays damp, mold comes back after cleaning. Wet materials should be dried within 24 to 48 hours to prevent mold growth, and indoor humidity kept below 60%, ideally 30% to 50%. So a good quote says where the moisture comes from (rain water, ground moisture, humid outdoor air, a plumbing leak) and how it will be stopped, not only how the mold will be removed.

Can I clean it myself?

The EPA says that if the moldy area is less than about 10 square feet (roughly a 3 ft by 3 ft patch), in most cases you can handle it yourself, following its guidance. Larger areas call for its remediation guidance or a professional. It also says dead mold can still cause reactions, so it has to be removed, not just killed, and that biocides are not routinely recommended.

Do I need a mold test?

Usually not. The EPA says that if mold is visible, sampling is usually unnecessary, and there are no federal limits for mold or spores, so a test can't tell you a level is "safe". HomeGuide puts mold testing at $200 to $400. Testing can help in specific cases, such as a smell with no visible mold; ask what the result would change.

What does mold removal cost?

What to ask

• Where is the moisture coming from, and what in the quote stops it?
• How will the mold be removed (not just sprayed), and how much area is affected?
• Is any wood damaged enough to replace? Ask to see it.
• If the mold has reached ducts, will they be cleaned? The EPA says not to run the heating and cooling system if you know or suspect it is contaminated.