This is my first time posting a question here, and I would apprieciate any help. Here goes. I planted a weeping willow tree this spring in my front/side yard. I have since discoved that a water line runs about 7 feet from where I planted it. Now I know about weeping willows invasive root system, but would rather not move the tree, It's in the perfect spot. A friend of mine who works for the water company looked up the water line records a told me it an 8" diameter ductile iron type pipe. I have heard the the new plastic pipes are safe from tree roots. But I was wondering if ductile iron pipe was safe also? If anyone has had a experiance with roots getting in a ductile iron pipe, please tell me about it. Gary p.s. sorry about the bad spelling, I can't get the spell check to work.