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Old 02-21-2010, 05:29 PM   #1
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Water pressure loss with use in house


The water pressure/volume in my house drops off greatly as I open more faucets. Supply line from main is 3/4inch PVC. Water pressure at supply line coming into house is 56lbs. However, with 2 hose bibs open pressure drops to 24lbs. Water company says there is no problem with tap into main or with meter(they actually removed meter and tested it). Water company says that I am only getting about 16 gallons per minute flow when hose bib at supply line coming into house is turned on. They say it should be 25gpm. Water company suggested that I upgrade my supply line to 1 1/4 inch to allow for more volume from meter. Does this sound right?

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Old 02-21-2010, 06:13 PM   #2
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Water pressure loss with use in house


do you have a pressure reducing valve where the water line comes into the house? or is there one on the house side of the meter. Sometimes they can be adjusted or if bad replaced

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Old 02-21-2010, 09:38 PM   #3
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Water pressure loss with use in house


2 hose bibbs wide open? That would drop the pressure pretty good.....

Is there some reason you need them both wide open? Shoot, we never plumb houses thinking that 2 or more hose bibbs will be used at a time.
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Old 02-22-2010, 01:16 AM   #4
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Water pressure loss with use in house


I agree, you will for sure get a big drop if you open two hose bibbs all the way. that said have you also checked to make sure your main valve is open all the way and is a full port valve?
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Old 02-22-2010, 08:28 PM   #5
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Water pressure loss with use in house


Finally, got the problem diagnosed. Had plumber and water company out at same time. Water company finally figured out that there is a problem with their tap into main water line and there is not enough water volume flowing to the meter, thus to to the house. Apparently, they did not cut completely into the main line when they tapped into it. They are going to re-tap the main line and that should solve the problem.
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Old 02-22-2010, 09:54 PM   #6
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Water pressure loss with use in house


Good to hear it's going to get fixed.

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