Doesn't look large enough to contain the home water supply shut off valve.

Hi, Maybe it' storm drain for your yard. Put a hose down it and try to fill the pipe. if it doesn't fill up buy a grate to cover the top.

Good Luck

Woodbutcher

Between sidewalk and street is parkway easement. Call your city.

Hi thanks for the information. Any idea what type of grate i should buy to cover it? PVC, metal? what would I search for to know what to cover it with?

I found something similar in my yard. I forget the exact name, but mine has to do with access in case of a sewer issue. Have someone flush inside and see if you hear the water running. I bought a cap and a little box to sit atop it to protect it from lawnmowers at home depot in the section with drainage/landscaping pipes.

https://youtu.be/Or3fVPc7YwY

If it's a sewage relief pipe, you can get a cap for it called a sewer popper which will seal it but pops open if the pipe backs up putting pressure on it from the inside. This saves you from sewage coming up inside your drains but keeps it capped off otherwise.