For our camp site we actually buried a 1000 gallon tank about 10' behind the camper. I paid a friend of a friend around $1800 (can't exactly remember) to buy the tank, dig the hole with his smaller back hoe, add the riser pipes, etc. that was 3 years ago and we haven't pumped it yet. I only run enough gray water to flush the hose out, the rest waters the grass in the area. It really works out slick.