We have a well and dump our manure far from where it can soak into the ground into our water system.
Be careful and make sure that when you dump manure it's not where it can get into anyone's water supply.
Good luck! :)
Good thing to remember! We're on a well, too, and have to be careful. Our garden is a bit close to the well - but the manure piles are not concentrated in that area. Then again, horse manure isn't nearly as bad as chicken. We have to thoroughly compost chicken poo before we can use it...