I just had someone call me and say their neighbor just had a new irrigation system installed. Since that time the caller has been hearing his pipes rattle in his 10 yr old house in association with the neighbor's new system running. He was asking me if he should get a lawyer and who should be held accountable. Glad I'm not involved! Anyway, it raised some questions: How does this happen? Is it just poor system design with excessive pressures? Would a check valve at the cross connection reslove this? Any input appreciated.