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Old 12-12-2009, 12:53 PM   #1
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Sizing Well Pipe


I am running a new supply line from my well to the house.(160')
The well and the pressure tank are located within 3' of eachother.
The drop pipe from the pump (1 hp/ approx. 80' depth) to the tank is 1-1/4".
The run from the tank to the house(160') is 3/4".
Since I am digging a new trench and running new pipe, would it be beneficial to spend the extra money and plumb the new run with 1-1/4" pipe? Any help would be greatly appreciated..


Last edited by SeaWolf; 12-12-2009 at 01:38 PM.
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Old 12-12-2009, 03:19 PM   #2
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Sizing Well Pipe


The minimum sized water service allowed in MA is 1", and that is sufficient for most homes. You're water main inside the house (after the well tank) is probably 3/4" or 1" anyway, correct?

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Old 12-12-2009, 03:40 PM   #3
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Sizing Well Pipe


The house main is 3/4". Installation instructions of the well pressure tank call for it to be plumbed with the same size pipe from the tank to the house as it is from the pump to the tank (1 1/4"). It was not installed this way. Since I am running a new line anyway, should I install the diameter pipe that the instructions call for? Would it be cost effective? Would there be a noticeable difference in water volume in the house? If I am doing it, I want to do it right. Thank you for all your help.
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Old 12-12-2009, 04:02 PM   #4
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Sizing Well Pipe


If you're already digging the trench anyway, it won't cost you much more to run a new water service - whether you choose 1" or 1 1/4". It'll just be a handful of fittings and some polypipe. In MA, a 1" water service/main is adequate for up to about 2- to 2 1/2 baths. If you have more than that, or you eventually want to add another bath, OR if you you want to run water from your house to serve a garage or something, run the 1 1/4" and then you can tee off of it just before it enters the well tank in your basement.

Last edited by Ishmael; 12-12-2009 at 04:17 PM.
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Old 12-12-2009, 04:39 PM   #5
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Sizing Well Pipe


Thank you, Ishmael.
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Old 12-12-2009, 05:07 PM   #6
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Sizing Well Pipe


There's probably a bushing (1 1/4" to 3/4") in the "pitless adaptor" (the collar that wraps around the well casing where the horizontal line from the house meets the vertical line from the pump). Be real careful not to crack the well casing when you remove that bushing and install your new fitting.
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Old 12-13-2009, 09:41 AM   #7
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Sizing Well Pipe


I live in FL, and the pump line comes out of the top of the well casing and then into the pressure tank, which is right beside it, then reduces to 3/4" before being buried the 160' to the connection at the house. This setup makes the job easy because all plumbing (except the straight buried run) is visible and easily accessible. Thank you for the time..take care.

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