Does anyone know how to get hold of plans of the layout of sewage and water pipes near my house?

I just called the water and sewer Dept. and told them I was going to dig could they send someone out to mark where the sewer and water lines are so I don’t hit one of them while digging. Here in Oklahoma we also have 1-800-Call-Okie = 1-800-xxx-xxxx and they contact everyone involved Phone, cable, water, gas & sewage. They all come out and map their respective items with either paint or little flags.