Concerned: Let me first say that anything an agent sees with their naked eye, they are required to disclose to the prospective buyer(s) they are showing the home. These are called latent defects. If they are not visible to the agent or to the buyer, the only way to know what does exist, if anything, is with inspections. All kinds are available: septic inspections (usually a buyer expense of $250), home inspections (usually a buyer expense of $250-350), mold inspections (these can be free if they are quoting repairs), well inspections (can be a buyer/seller paid expense, vary in price depending on what you are wanting to have tested), and so on. There are other inspections also, like foundation inspections. Of course, these fees can be negotiated as to whom pays for the service, but I would want to hire the individuals myself, just in case there is any chance the sellers could hire a friend to say what they want (not a good idea for fear of lawsuits but does happen). As the other responses have said, Alabama is a caveat emptor state, which means the buyer does not have to offer any disclosure. Now, if the seller has mentioned it to the agent and the agent is asked directly, that agent is required by ethics to disclose the information they are aware of, if not, there could be a big lawsuit there also. Hope I have helped in some small way. Find you a good, ethical, educated agent to work with during this process. Do your research and interview agents. Good luck!