A business plan would be helpful.

A water park is essentially a large, complicated swimming pool, with a lot of extra space around it for lounging and sunbathing, room for concessions, such as food, souvenirs, and stuff people “forgot” to bring, like towels, sunscreen, hats, sunglasses, bathing suits.

You need a few acres, for the park and for parking. You need extra space for the water purification/filtering/heating.

And then you need to staff it. Lifeguards, ticket sales, janitors, parking attendants, concession staff. Training and management.

And, before you get too far, you need to find out if you can get water. This isn’t an ordinary 2 inch supply pipe, we are talking hundreds of thousands of gallons, and having to add tens of thousands of gallons every day!

Maybe millions of dollars, the pumps and plumbing are huge and expensive.

Too complex to be answered here.

Go to this site:

https://howtostartanllc.com/business-ideas/waterpark

(To add to the above responses)... and also (at least) incoming and outgoing water filtration systems on each attraction to prevent the spread of waterborne illness and fecal contamination.

There will be a number of public health codes that will need to be met on an ongoing basis to be open to the public.

To add to everything above, a large amount of money (millions of dollars) and liability insurance.

^^^ Liability insurance is the reason most waterparks have had to close,

Not that they are dangerous—just that people can sue for anything, and there is SOME risk at a waterpark, and potential for injury—that is why insurance is so high,

@Yellowdog – there have been some nasty accidents at water parks, from collapsing slide structures to beheadings due to collision with tunnel entrances.

Water parks can be quite dangerous.

@RocketGuy In 1997, a slide in Concord CA near me collapsed when kids on their Senior Trip tried to :“clog” a slide by having more than fifty kids slide down in bit mass. The combined weight caused the slide supports to fail.. 1 girl killed, 56 kids injured.

That sort of thing should never be allowed—one person should go down the slide at a time.

That park needs to be shut down permanently and fined for millions.

I heard the kids suddenly piled on, and didn’t heed the warnings. Typically park rides are run by summer work teens not professional bouncers, so it’s pretty hard to stop crazy crowd behavior.