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Main feed water pipe corrosion through basement wall
I have what looks like the sign of a leak at the first elbow of my main city water line coming into my house through the cinder block basement wall. My first question is how serious is this (do I need a plumber over here now)? Secondly, how did this happen, i.e., is it rotting from the inside or from the outside (wet inside the basement wall)? Finally, how intensive (nee, expensive) would the fix be?
The first pic is a close-up of the pipe, the second is after some cleaning. Thanks for any advice.