low water pressure

I have high water pressure at the front yard spigot, however, the pressure drops substantially inside the house and even further at the rear yard spigot. I have checked the house water filters and unit, they are clean and fully functioning. I have replaced the water pressure control valve in the front as well. The house is on a slab and there is no evidence of a leak. Any ideas as to the source of the problem?
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age of house? 30-40 yrs? Could be galvanized pipe which slowly but surely corrodes. Worse in hot climates. worse for hot water lines. Affected by water ph also.
lee h
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Marc wrote:

rust. It can also be calcification.
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if this is metered, have your plumber arrange with your water company to change the meter which is probably not the culprit. he can check the system for leaks and also replace all old main shutoffs with new full throttle opening lever operated water ball valves to permit easy shutoffs for the repairs or replacement of blocked stop-and waste valves [replace with ball valves] and clogged elbows and clogged fixtures. also consider an upgrade to 3/4" from 1/2" copper to improve water flow throughout the home. depending on your climate and the positioning of the water lines, if there is no water meter because you are flat rate or on a well you could use an inexpensive screw on water pressure meter with adapters to the aerators of the fixtures to see if you have an unseen leak. listen for pipe noise with stethoscope. or just let the plumber do it all, the more experience and age the better. take out all aerators and showerheads, run water while banging on all pipe elbows if galvanized to knock any buildup loose but carefully to use large hose cock opened starting the bang it thru at rear of house first to let out large debris. measure the pressure and the gallon flow, both determine how much water comes thru the rear yard hose and to each device.
Marc wrote:

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wrote:

Did it used to be higher at those places?
When did it change?
Did it change gradually or suddenly?
Etc.
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