AN you are correct regarding the disclosure process. Also if you are going to remove the pool I would suggest you do it correctly.
In short you need a plumbing permit and an electrical permit to make sure all electrical, gas, and plumbing connections are terminated correctly. Also when you are filling in the excavation there are two alternatives depending on if you are going to build on top of the filled in site. If you are not going to build on it then you CAN fill in the assocation debris and bury it. However there are details you need to be aware of.