“In my case, I like to take a nice shower to take care of my beautiful hair,” Trump said as he signed the executive order, which the White House said would apply to multiple household appliances, including toilets and sinks. “I have to stand under the shower for 15 minutes until it gets wet. It comes out drip, drip, drip. It’s ridiculous.”
The actual pressure is determined by the height of the water tower in which the water is stored. There are regulations as to the minimum water pressure for safety reasons. I’m my area the minimum pressure is 50psi. The government, at least to this point, had pretty good regulations regarding pathogens and stuff so these rules apply, as others have suggested, to the flow and capacities of various plumbing fixtures.