If it's a public utility, local water district, co-op, etc. they can probably get a right of way from you, at no cost...all for the public good, with powers of eminent domain. You should be able to talk to the engineer and find out where they want the water line, explain what you want, and work it out. It's never a bad thing having community water on the border of your property. Think of it as insurance for yourself in case of well troubles, and a good selling point in case you ever decide to sell.
If it's a private, for profit group, you have some bargaining points. I have public utilities crossing my place, and I'm "S.O.L." as far as any kind of rights. I have Private r.o.w.'s and I extract payments every time they disturb a blade of grass. This summer, I got $7500, or $6/ft. for a temporary easement. They used an existing road for a month, intermittently since, and it looks like the terms of the easement will kick in soon, if they abandon the gas well they were working on, they lose the temp. easement forever.
I seriously doubt whether they can force you to abandon your well, and make you start using the community water. I would insist on in the future, should you decide to hook up to the water (you never can tell???) that you be allowed to hook up for free, with a free meter, in exchange for them crossing your land.
Talk to neighbors, see what the overall situation is...may not be worth talking to an attorney, if there putting in a region wide water system. Just try and tie down the exact area the line would be installed. Usually, they want it close to the main road. Good luck.