It would depend on where you live. Probably nothing as Robb said. But, for example, if you live in a housing development, you may need permission from the Association. This would be because there may be regulations concerning the security of the pool, like Fencing. If you live in a rural setting, nothing will happen as there is most likely no regulatory agency.
Probably nothing.
You may need a permit to "blow up" a pool within the city limits or anywhere. However, if you are inflating the pool you probably do not need a permit.
You need a permit to build one in most populated areas. You need a permit to run a public pool. You don't need a permit to operate a private home swimming pool.
As you already know, in some states you do need a permit to remove a pool.
it would get dirty
No you cannot, because the pool would leak and not work properly without the liner.
Permits are required in every part of the country.
Yes, I am sure that most things you do on your property require a permit.
In most cities such a structure as an inground pool will require a building permit. You will have to contact your local city hall to find out for sure.
Unless it hit you, nothing.
It would tip over but still float.
Pool Edge happened in 2002.
Pool Paradise happened in 2004.