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Old 04-01-2013, 09:53 AM   #1
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low water pressure - how to discover issue?


I just moved into this house, built in 1977 ... I noticed if you flush the toilet in one room, bathtubs, sinks, everything in the houses water pressure basically disappears.

How can I start debugging this if you will?

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Old 04-01-2013, 10:11 AM   #2
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low water pressure - how to discover issue?


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Originally Posted by vivithemage View Post
I just moved into this house, built in 1977 ... I noticed if you flush the toilet in one room, bathtubs, sinks, everything in the houses water pressure basically disappears.

How can I start debugging this if you will?
Debugging can commence by stating whether your water source is from a well or municipal system. A reasonable guess at this point would be there is a problem between the supply source and the house. Start at the most distant end of the system from the supply and work backwards until a good flow and pressure is found and maintained. Hopefully this will narrow down the area the problem is in.

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Old 04-01-2013, 10:17 AM   #3
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low water pressure - how to discover issue?


need more info. do you have city water or are you on a well? what type of piping do you have? is the main valve open all the way? did the house set empty for a while?
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Old 04-01-2013, 10:18 AM   #4
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low water pressure - how to discover issue?


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Debugging can commence by stating whether your water source is from a well or municipal system. A reasonable guess at this point would be there is a problem between the supply source and the house. Start at the most distant end of the system from the supply and work backwards until a good flow and pressure is found and maintained. Hopefully this will narrow down the area the problem is in.
municipal ... there is a water tower 2ish miles form my house, if that is even where it is coming from. Is there a simple way to measure flow?
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Old 04-01-2013, 10:18 AM   #5
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low water pressure - how to discover issue?


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need more info. do you have city water or are you on a well? what type of piping do you have? is the main valve open all the way?
This is my first house ... i'll have to check when I get home!
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Old 04-01-2013, 10:31 AM   #6
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low water pressure - how to discover issue?


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municipal ... there is a water tower 2ish miles form my house, if that is even where it is coming from. Is there a simple way to measure flow?
Flowing water into a pail/ bucket for one minute is about the simplest way I know of. That method will give time and amount. Pipe size will be a factor but not at this point. We're looking for a culprit now.
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Old 04-01-2013, 11:10 AM   #7
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low water pressure - how to discover issue?


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Flowing water into a pail/ bucket for one minute is about the simplest way I know of. That method will give time and amount. Pipe size will be a factor but not at this point. We're looking for a culprit now.
Where should I have it flow from? nearest to the municipal water entrance to my house?
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Old 04-01-2013, 12:01 PM   #8
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low water pressure - how to discover issue?


If you open a valve farthermost from the house supply entrance and while it is open if a fixture closest to the water supply entrance to the house is opened and has little to no flow I'd suspect the problem to be between the second fixture you opened and the meter.

Good flow at the entrance point would indicate a problem within the house.
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Old 04-01-2013, 01:15 PM   #9
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low water pressure - how to discover issue?


Do you have an outdoor hose bib / hydrant you could check flow from?
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Old 04-01-2013, 01:17 PM   #10
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What size water piping did they use?
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Old 04-01-2013, 11:08 PM   #11
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okay, so I turned the shower on ... furthest away, and then the sink, which is maybe 8 feet off the house line in ... and it was dismal ... should I just call the city out to look at it? It looks like the majority of the copper was updated, as a lot of it looks pretty new, and they are 1/2"
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Old 04-02-2013, 03:02 AM   #12
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Do you get good flow from any faucet or hose bib?
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Old 04-02-2013, 11:05 AM   #13
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Do you get good flow from any faucet or hose bib?
yes, if it is the only source of water running ... so if I turn on the furthest shower/faucet it is decent, but then I turn on something else in the house, util sink (1-2 feet from line in) they both are low/slow.
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Old 04-02-2013, 11:19 AM   #14
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low water pressure - how to discover issue?


Do you know your water pressure?
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Old 04-02-2013, 11:30 AM   #15
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low water pressure - how to discover issue?


Sounds like either the plumbing is too small, or, the pipe between the meter and the house has become clogged with mineral deposits -- especially if galvanized pipe was used.

If your whole house was recently replumbed with copper, 1/2" for the mainline is too small to meet code. Did the previous owner use a professional plumber? Was a permit pulled / was an inspection performed? 3/4" is generally the minimum, with 1" being used for the mainline in many cases. 1/2" can generally only be used after splitting off the mainline and feeding a single fixture. If the mainline is a mere 1/2" then I would certainly expect exactly the sort of problem you're experiencing.

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