I’m having some strange water pressure issues in my house. The cold water pressure is very weak in most sinks/faucets/spigots (although seemingly normal in the bathroom) but the hot water is normal throughout the house. But when I run the laundry, or open a bunch of faucets at once, the water pressure is weakened even further for cold and now even for hot.

My home warranty sent out a plumber today. I asked him to check the pressure regulator which is located at the street and he said that’s not the issue. He put his meter on the spigot outside my house closest to the street connection, and he said it’s reading 100 psi which is normal. But when I looked at the water coming out, it looked visibly weak like the rest of the house.

He’s saying it’s got to be an issue with repiping the whole house. But isn’t it worth him adjusting the pressure regulator first to rule that out? He wouldn’t touch it. I’ve called my own plumber out to look next week.

The guy today said his best guess is that the pipes have electrolysis and are very clogged because they are old galvanized pipes wrapped in some copper. If that’s the case, am I in for a nightmare? Is there a way to identify and localize an issue or does a plumber just replace the entire system of pipes? Yikes