Best PSI for full house plus tenants

psilva8

I've quoted my first post for reference.

It's possible the service coming from the watermain is galvanized or lead. If that's the case it could be the size of a pencil inside.

TheEplumber

I believe your assumptions are correct.
I also ran a quick, off the cuff water pipe sizing- @ 46-60 psi range, the service will be best if upgraded to 1" with 1" building supply. Again, this was a quick guess based on the fixture count in OP's opening post

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anuvanoob

Well I unclogged or replaced the fixtures in my home and now I get outstanding pressure from all fixtures even when they're all running at the same time. I guess the problematic fixtures made the pressure appear much worse than it actually was. Having washer on in the basement does decrease the pressure on the main floor fixtures but not significantly.

The pressure does get dramatically worse again on any of the main floor fixtures when the utility sink is on. I assume that's because the utility sink is at the bottom of the water system and releases so much pressure plus it doesn't have a reducing method like the kitchen and bathroom fixtures. I guess this is to be expected.

Looks like 49 PSI may be good enough after all. Just barely I bet.