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US. I’d be surprised if anywhere was allowing more than 80psi.
20psi is really low so this value may have different variations. I’m on a well pump and before I replaced it I was getting down to 20psi. It barely dribbled out of the 2nd floor shower head. I now have the pump set to 60/40 with a 50psi restriction valve. This seems to be the sweet spot.
I’m not in plumbing and won’t know how to look this stuff up.
Speedtest.net bought a service that was doing this already sort of. I looked just now and I think it’s their “map” option on their mobile app. You need to switch between carriers to see coverage.
The tech was based off of manual speed tests and a background app that would measure coverage from a phone for a small area, about the size of 3 square acres.