I have a leak on the side of my house. It appears to be a very corroded valve or cap. The location of this leak is after my pressure reducer, but before my main line water shutoff. It appears to be the piping heading into my garage located near the water heater and the washing machine.

Please post a picture of it, Thanks

John

after my pressure reducer, but before my main line water shutoff
Yes post picture, usually the shut off valve is the first thing inside..