Hi Matt (again!) Since most
roots go easily to 4 to >10 feet deep, a septic field (are you pipes deeper than 4 feet?) is not really protected. Even grasses can go much deeper than the standard leachfield. Vegies like lettuce, tomatoes, beans, and many more can have at least some roots to go to 4 feet. Don't forget tree roots grow .5 to 3 times wider than the
canopy, so many leachfields are prone to
root intrusion from nearby
trees. At least out in the woods where I live.