Shut-off in Lake Samish

Had a electric water heater replacement in the Lake Samish (Bellingham, Whatcom County) neighborhood. The old water heater was 26 years old, as was the piping, so your first response would be that the owner is one lucky fella, right?

Well, Lake Samish is very special (and they know it) because most homes get their water directly from the lake. I mean, pulled directly from a recreational lake into their homes. The water pumps have regular whole house filters at a minimum and some homes have very sophisticated water purification systems.

Long story short, the picture shows his water heater shut-off on the right and a new one on the left. His pump brings in 90 p.s.i, so that crud in his valve is hard as stone.