Discontinuance. If the use of the swimming pool is discontinued or if the swimming pool should, at any time, be in an unsafe or hazardous condition and the pool is not repaired by its owner, the owner shall, on demand, fill in the pool to grade, and shall not restore the pool to use except upon a new application for a building permit. In the event the owner refuses to fill in such pool, the Village shall have the right but not the obligation to enter upon the land, fill in such pool and assess the cost of such work against the property as a lien collectable with the next real property tax due upon the property.