@Ned J. I agree with Ned. Most mold is not toxic, and even most black colored mold is not "black mold". When I have a situation with mold, I first eliminate any source of water or moisture. Next clean the area with something like TSP. If the tenant is in a panic, or sometimes even when they are not; I bring out a certified mold inspector to test for toxicity. This costs about $300 - $400 in my market.
Be sure to hire someone who only tests and does not do mold mitigation. The mold mitigation guys will ALWAYS find dangerous mold!
Often, once a tenant (especially their parents and friends) hear the word mold or see any kind of mold, they go into a panic and nothing short of tearing down the walls will make them happy. And then they will still not be happy.
For these types, I offer them the opportunity to break the lease without penalty, and also give them their security deposit back. Of course before moving in new tenants we want to make certain there is no danger to tenants or the property.
Bob Collett
Collett Property Management, Plum Tree Realty