Household mold is usually caused by leaks, which can be due to seepage through the foundation of the home, condensation created by sweating pipes, plumbing leaks, poor insulation, or leaks in the roof. Warm climates with high humidity and flood prone areas are also at risk for household mold, but it can occur anywhere.
If you are concerned about mold, check your home for tell tale signs. Some of these include:
-Floors or walls, which are damp to the touch
-Water stains on walls, floors, or ceilings
-Walls, floors, or ceilings that bulge
-Musty smells, like the odor of wet dirt
-The appearance of mold or growths (mold is not always greenish-blue as one might expect it to look. It can be grayish-brown to black and even red in color).
Another thing to consider is if anyone in your home experiences recurring illness that has not been diagnosed. Symptoms are usually similar to those of allergy problems, although they can become quite severe.
You can find more information about mold by visiting the EPA online. This site also offers good information for getting rid of mold, if you find that you have a mold problem.
If any of the above problems are present in your home, or if your home has had water damage for any reason, it is a good idea to test for mold. You can hire an inspector or detection service to come out and check your home for toxic mold. Visit Mold Inspector online, and scroll down to find a certified mold inspector in your area. This site also offers a lot of other helpful information.
You can also conduct your own mold testing. Look over this Sick House page for great information and a step-by-step guide to proper collection of samples. Simple Mold Testing Kits are available as well and come complete with everything you need to collect and send the samples to an accredited lab.