Glad you asked...
If you live in an area without city or county water and sewer, or connection is not a requirement, you may consider a septic tank. First, you'll need to carefully choose the location of the tank, the drain field for the tank, and an alternate drain field, should the first fail. This pdf provides in-depth installation instructions for a drain field: http://www.nmenv.state.nm.us/fod/liquidw... Important considerations, even when you hire out your installation, can be found here: http://www.laundry-alternative.com/insta...
Then again, this answer might help you...
Installing the drain field you will need to make sure you have a lot big enough. If your lot is big enough there are four other things to consider. You need to pick the perfect spot, perk rate of the soil, depth of the soil and depth of the seasonal high water.

