Re: Follow up?
The regulations and frequency of inspections depends on the jurisdiction. This kind of thing is not a Federal issue, rather it is handled at the State level. If you are worried about it happening while you are there, do your due diligence before spending vacation money in any given State.
Note that this one happened when the park was not open for business. I rather suspect a plastic (fiberglass) waterslide wouldn't be very easy to burn down if it was in operation, with water running through it.