I wrote earlier that we dicscovered some mold or mildew growing on the drywall covering a basement wall. There was a leak which is being investigaad, however my biggest concern is the mold even though there was not much. Pardon my being a newbie but how does one mitigate mold and or/reestablish indoor air quality after such an event? Thanks much in advance!

First step: Relax. Mold and mildew are around us all the time, and always has been. The problems come from having large quantities of it in confined spaces. If the drywall that was affected has been removed, clean any remaining, suspect, areas with a solution of bleach and water, which will kill any remaining spores. If you are still not satisfied, spray the areas with a borate solution. If there is wood involved, the borates will soak into the wood and provide permanent protection from future problems. Assuming you can keep the basement dry and have adequate ventilation, you should have no further issues with mold.

I second Wes's comments. If the drywall is still in place, and the mold appears to be primarily on the surface, which I'm sure it is, bleach and water will clean it off. Then just prime and paint. The only time mold is truly an issue is if the whole house is covered, and then it's mostly a cosmetic problem, or if a person in the household is hyper sensitive or allergic to mold spores.

Kill the spores & any remaining live culture with bleach, and keep the humidity in the space to 60% or lower with a dehumidifier.

Mold potentialreally takes off at 70% RH & up, so give yourself some margin. With reasonable under-slab vapor barriers, foundation waterproofing, and limited outdoor air infiltration the dehumidifier won't run a very high duty cycle to hold that limit, until/unless there are more bulk water leaks.

THANK YOU! That's a relief...it's easy to jump to the worst conclusions when the "M" word is used:)

And while we're on the subject, just a reminder about what I unfortunately learned last summer.

If you're building a house with a sealed conditioned crawl space be sure to ventilate the crawl space with a fan or blower after the sub flooring has been laid and until the house is closed up. I didn't and mold formed in the crawl because it wasn't ventilated and rain water ran into it through the sub flooring before we got the roof on.

Clean up as much as possible before dehumidifying, mold spores when humidity drops, so get rid of as much as possible BEFORE you dry it up.  Otherwise, it will scatter throughout the building via any air movement.