What is a safe PSI for home water system? Plumbing question.

A lot would depend on what types of pipes you have and what they're rated for

Your plumber is either conning you or retarded. Your psi can't get too high, the higher the better.

There is usually a pressure regulator inside your home somewhere, usually right where the water line enters the house. Mine blew out several years ago, and I only knew about it because some o rings on a faucet broke because of it, and then my water heater was having a pressure issue and the relief valve would trip and some water would come out of the pipe. I think it was pretty cheap to have the plumber replace it. I'm not sure about the proper pressure, but if your regulator is shot, you will have some problems eventually. Would you rather have it replaced now or after something bad happens while you're away and there is water everywhere? Luckily in my case it just leaked into the basement and only messed up one wall of drywall.

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Your psi can't get too high, the higher the better.

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Oh, yes it can be too high.
I lived in a low area where water pressure was around 120 psi. The city had to put in pressure reducing valves. Before that people's washer hoses, garden hoses, etc. would blow.

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WHAT?

i had my old non-working pressure reducer valve replaced (looked like an upside down bell) for like $150

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Crazy. Here's the whole thing: The customer needs to change out the rubber washing machine hoses before they burst *
* Also the emergency water shut off on the hot side is corroded,leaking at some time *
* Water pressure to the home is way to high. 90 psi can cause multiple plumbing *
Findings
Option #1
Replace Pressure Reducing Valve 3/4-IN
- Remove Existing Install New Whole House Pressure Reducing Valve (No Expansion Tank)
2 Year Standard "No Charge" Replacement Warranty! Investment: 772
Option #2
You have rubber hoses which can and burst sn
Replace Laundry Hose Faucets (Pair)
- Replace hot & cold valves
2 Year Standard "No Charge" Replacement Warranty! Investment: 437
Option #3
Replace (1) Angle or Straight Stop Valve
- Close Main Water, Remove Old Valve, Install New Chrome Emergency Stop Valve
2 Year Standard "No Charge" Replacement Warranty! Investment: 230

90 is fine, but if you're worried you can get a pressure reducing valve to lower it.

There's some places in NYC that are even above that due to geography.

so what..he's saying those pipes are bad because the PSI has been at 90?

are those w/d hoses actively leaking?

i mean..damn..

my last house had that shitty chinese PVC from the late 1990s that turns to powder in your hand when you squeeze it and the plumber just said as long as the PSI was 75-90 it would be ok.

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are those w/d hoses actively leaking?

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I laughed at him for suggesting this. I don't get what that's about. I felt like he was conning me there.

It is PVC everywhere. Where is the regulator located?