How do we find the sewer pipe cominginto our yard. We need to connect to it.

Where do you live and a few more details would help. Most sewage systems require a licensed plumber to do the connection. If you are not connected now there likely is no pipe in your yard at all. There may be a main at the street but no tap.

How do we find the sewer pipe cominginto our yard. We need to connect to it.

You call The Building Department in your area and ask where the street raiser's located for your address or lot number. Good luck, Tom