Executor and Estate Attorney selling property with UST (underground storage tank) defect.

I inherited property with two siblings, one of whom is executor who lives out of town. I live at property and in the past years there have been problems with the heating system most likely due to a leaking fuel oil underground storage tank. I do not want to be liable for buyers or new owners lawsuites against me because I did not disclose this, so I sent a letter to the Estate Attorney, stating I am disclaiming liability for nondisclosure. The property is being sold As Is. Can I assume that the Executor and Estate Attorney are solely liable if they don't disclose this to prospective buyers. Thank you for comments.