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Question DetailsAsked on 8/8/2017

What causes low water pressure on the first floor and regular pressureon the 2nd floor?

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1 Answer


I am assuming you mean at all fixtures on each floor - not just at one. If just at one AND you actually mean low flow, not low pressure, then could be a corroded up valve to that fixture (if only on hot OR cold), or a restricted outlet like a crudded up screen on a faucet or showerhead.

If in a high-rise building, then most likely your first floor is at the top of a water zone of maybe 5-8 floors or so (so at the lowest pressure of that zone - typically maybe 30-40 psi), and your second floor is the bottom floor of the next zone so at the highest pressure of that zone (typically 50-70 psi).

If a stand-alone 2-story building, assuming this pressure is consistent at ALL fixtures on each floor, then assuming the two floors do not come from separate water systems (which would be a major oddity), then you must have a pressure regulator on each floor and the first floor one is running low - which you may be able to adjust on it, or it may be frozen up at the low pressure on the first floor plumbing. This would be a very unusual situation - single family and duplex buildings typically have only one pressure regulator, on the entire building.

I would try to track down if this condition applies to ALL first floor fixxtures or just one, if you actually mean pressure or maybe you mean low flow, and if to both hot and cold or just one - this would narrow down the possibilities.

If above did not help, then Plumbing would be the Search the List category to find well-rated and reviewed contractor to diagnose it.

Answered 3 years ago by LCD

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