what is the safe distance between water pipes and a weeping willow tree?

Answer 1

Dlmgrnk is correct. The roots won't bother a water supply pipe as long as it's not leaking (and if it's leaking it will fail anyway). However a weeping willow has shallow roots and is a real water hunter so it could get into your sewer line, which is usually not sealed as tightly as the water supply line is. Also these will be huge trees so I would not plant them above the water or sewer lines as their weight could compact the soil and bend the pipes beneath them. Frankly I would not want such a tree anywhere near the utilities and I would plant a small tree like a dogwood or Japanese maple instead.

Answer 2

Assuming the water pipe carries water and doesn't release it, there is no problem with putting the tree right over the water pipe. The problem, if there is one, is that if the water pipe ever has to be repaired or replaced, you'll have to either remove the tree or relocate the pipe. If you want to avoid THAT possiblity, keep the water line out from under the outer line of tree branches. Tough to do if you're planting the tree and the line is there.

Answer 3

5 miles!!!!!