Campground Community for sale---lots of good stuff, one big bad problem

The campground in which I live is for sale, as the owners wish to retire.
There are 75 permanent seasonal campers, plus a dozen cottages, five of which are suited for year round living.
Cash flow is pretty decent, location is superb, we could be happy here for a long time.

BUT.

The water handleing systems are ancient and cobbled together--I want to explore a septic system which would handle all of the load and be better for the land overall.
Price will be a big factor, I admit I'm not even sure where to start atm.
There does appear to me to be an ideal spot for a large community system, but what do I know?

Sellers are very afraid of the state gubmint, and I want to respect their fears by not being the one who makes the call and gets the place shut down.
I don't know that it would happen, but they are very worried about it.

susan, I replied to your other topic about the septic.

If the people who own this campground know they would get in trouble for the state it's in, then you would have to bring it up to code, usually within 18 months. The rules are tough enough when they are for a single residence. But as soon as you start offering a place for the permies, the rules get extremely tough, because the public gets to have the expectation that everything there is safe for them, including safe drinking water and hygienic facilities. So expect major expenses regarding public use if you want to run it as a campground.

A friend of mine used to help run his cousin's campground, and people are showing up at all times of the day and night. They want what they want right then and there. There are issues with pets, kids, trailers, people trying to live in campgrounds, there are many things to consider.

Thank you cristo, I appreciate your response.

The sellers are elderly and afraid of what they don't know, the system is grandfathered and this state is very friendly to alternative systems.
That said, bringing it up to code is the point of my post, I am seeking newer technology and alternative designs which would suit a seasonal community of 100, year round community of 5, more or less.

A conventional system will not work here, perhaps a mound might, asking questions at places like here is part of how I do my research. Others in the group have their own ways and we come together eventually to hash it out.
Ideally we'll find a sustainable system we can all be proud of, its only one of many things we are researching. Funding isn't my department, our grant writer encourages us to look for groovy new technology on some things.

As for campgrounds in general, they are well within our experience and skill set, and have been at the top of our list for some time.
We've looked at a few, including one with its own water treatment plant now that I think of it!