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the water company - if you look on their website it should tell you what the minimum water pressure you should expect is. You can test this by timing how long it takes to fill a certain size bucket. This is only cold water. The hot water pressure will depend on your boiler and should not be reported to the water company.

There is more to this

Yes the water company states what the min pressure should be in some cases as low as 8 PSI but before you start doing the bucket measurement one has to know the size of their pipe as each diameter will give a different flow rate and also what material your water main is as many ferrous mains do have a severe build up of mineral deposits which also affects flow rates .

Also some mains do get "crushed" over the years if proper compacting is not used to insure the main is not bearing to much weight

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Q: Who is responsible for the water pressure coming in to a house?
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