testing for mold- how/cost?

If you smell it or see it, there is mold. Paying someone to test is a waste of money. You need to find a reputable remediation company to remove the mold. Testing companies are mostly scams and rip-offs, many will say the do remediation, but they largely just scrub it with some store bought mold killer.

You can google mold remediation. However, there are 3-4 companies that had 15-20+ sites that are all SEOed and come up saying the same thing.

columbiacounty is an expert on mold, ask him.

M&M Environmental did mine. I am not an expert on this topic, but M&M tested mold found during a partially underway gut. Cost to test was ~$300, remediation would have been additional. Good luck.

If you see black porous stains on the wall its usually a sign of mold. If not get a stain sealer such as Killz and that should do the trick.

JLC Environmental did environmental testing in our last apartment and did a great job. They were very professional and timely. Also, they explained all the tests and results in a clear, concise way that was very helpful to us. (http://jlcenvironmental.com/)