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Mold testing in Spokane, WA
Mold testing means taking air or surface samples and sending them to a lab to see what kind of mold is present and how much. It is worth it for hidden mold, after water damage, before buying a house, and to confirm a cleanup worked. In Spokane, expect about $100 per extra sample on top of an inspection.
When mold testing is worth it, and when it is not
| Your situation | Is testing worth it? |
|---|---|
| Musty smell but no visible mold | Yes. Testing plus moisture checks can confirm hidden mold. |
| After a leak, flood or burst pipe | Often. It shows whether mold has started growing in hidden areas. |
| Buying a house | Yes if there is a basement, crawl space, smell or water history. |
| After mold removal | Yes. A clearance test confirms the job is done before walls are closed up. |
| You can clearly see mold and know the cause | Usually not. The Washington State Department of Health says sampling is rarely needed when you can see or smell mold. Spend the money on fixing it. |
Types of mold tests
- Air samples: a pump pulls air through a cassette indoors, plus one outdoors for comparison. If indoor levels are much higher than outdoors, or different types show up inside, there is likely an indoor source.
- Surface samples (swab or tape): taken from a visible spot to identify what it is.
- Clearance testing: air samples after removal, to show the area is back to normal.
Why home test kits usually are not enough
Mold spores are in almost every home and in outdoor air, so a petri dish left on a counter will grow something almost every time. Kits do not compare against outdoor air, do not find where moisture is hiding, and cannot tell you how big the problem is. A professional test is read by an accredited lab and paired with moisture readings.
What mold testing costs in Spokane
Testing is usually sold as part of an inspection. Published Spokane prices we checked in October 2026 include one indoor and one outdoor air sample in a base price of about $425, with each extra sample about $100. See the full cost guide.
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Common questions
How much does a mold inspection cost in Spokane?
Most Spokane mold inspections with lab testing cost about $300 to $600. Published local prices we checked in October 2026 start at around $425 for a standard inspection with one indoor air sample, an outdoor comparison sample and lab fees, with each extra sample about $100, so a typical three-sample job is about $525. A visual inspection without lab samples costs less. Always ask whether the lab fee and the written report are included.
Is mold testing worth it?
Mold testing is worth it when you suspect mold you cannot see, after a leak or flood, before buying a house, or to confirm a cleanup worked. If you can already see or smell mold, the Washington State Department of Health says sampling is usually not needed: the priority is finding the moisture and removing the mold.
Do at-home mold test kits work?
At-home kits show that mold spores exist, which is true in almost every home, so they rarely answer the real question. They do not find where moisture is hiding, compare indoor air to outdoor air, or tell you how big a problem is. A professional inspection with moisture readings and an outdoor comparison sample is far more useful.
How long does a mold inspection take?
A typical home inspection takes about one to three hours on site, depending on the size of the house and how many areas need checking. If air or surface samples are taken, lab results usually come back within a few business days.
Is black mold dangerous?
The color of mold does not tell you how harmful it is, so treat any indoor mold the same way: find the moisture and remove it. The Washington State Department of Health says most molds do not harm healthy people, but people with allergies, asthma, lung disease or weak immune systems can react more strongly.