[ski wagen]

I would recommend looking at the land use code of any counties in which you are looking (most counties in Colorado have them posted on line). What you describe sounds like it would quite possibly trigger subdivision approval requirements, which will require, among other things, proving there is an adequate water supply for the development of the property (and it will likely also involve satisfying certain waste water disposal standards). An "exempt" well permit in Colorado allows use for up to 3 single family dwellings, one acre of lawn/grass irrigation, watering of domestic stock and fire protection, on a parcel that is a minimum of 35 acres. If the parcel size is smaller in acreage or the number of dwellings served is larger, then you're going to need non-exempt water rights, which, to obtain reliable rights, will be exponentially more expensive than the land.