Well to House piping question

RonR44

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I am 81 and have done a bit of DIY plumbing on our 'ranch' for 40 years, but I need some advice about running water from a well to a house we are helping our daughter build on our proptery.

The Situation:
The well is situated right next to a 3000-gallon water storage tank. 8-9 gpm well per the yield test the county required.
The well 'set up' has two pressure tanks and a booster pump already installed. (the guy who did this died recently so I am on my own now)
The house has a protruding 1" pipe that I need to hook up to, and it is about 70 feet from the well-plumbing, and with about a 5-foot elevation gain.
The house also has a mandated interior sprinkler system that will 'T' off of the pipe I run to the house. (it is already plumbed adjacent to the house water supply pipe - with gauge, check valve and such - with a one-inch galvanized union where I am to connect a line).
The pipe out of the pressure tanks is 1 1/4 inch, with a ball valve shut off, and a union, and ready to hook up.
The guy that did all the well set-up told me when he last left that he needed to come back to 'take care of one more thing' and said he would recommend a 2-inch line to the house to reduce friction. As mentioned, he died before he came back, and I want to finish the run to the house.
It is a three-bedroom home to be occupied by 2 persons initially. The water usage should not be extraordinary.

I have run water lines all over (barn, sheds, water troughs, and from another well to our house (though I don't know how well I did that - it has worked for us for 35 years), and have always used pvc, with galvanized at the ends of runs - as that is what I know how to do. I have not worked with poly, pex or anything else.

The trench has been dug from the well to the house (it will serve the water run and the electrical run from the house to the well - and I have confirmed that County codes permit water and electrical runs adjacent in the same trench - though the water line will be less deep).

Given my skill level, I intend to have galvanized plumbing (vertical and then elbowed to horizontal and then to PVC) at each end with PVC for the rest of it - as that is something I know how to do.

SORRY for the long post, but I like to provide as much info as possible as I am not sure what might be relevant.

Anyway: What diameter pipe should I use for the run? Remember it is 1 1/4 inches at the well and one inch at the house. I would have just ran 1 1/4 myself, but the guy that set it up mentioned he was going to use 2 inches, and 2) am I missing anything, and 3) all suggestions welcome.

Any help you can give this old guy will be very much appreciated. I would like to DIY to save my daughter money but I am not totally opposed to finding someone to help finish it.
Ron
 

Valveman

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Only going 70' the 1" should be large enough. But 1 1/4" would not hurt. PVC is my favorite too. I don't even like galvanized on the ends. I would use brass if metal was needed.
 

RonR44

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Some additional / new information about my post. Checking further, I see that the County has banned galvanized pipe in new construction. So, I will have to rethink part of this. Someone else said I could wrap any galvanized pipe with pipe wrap tape but I am not sure about that. If I cannot use galvanized, I guess I come out of the ground with PVC or HDPE. Still checking, and will look for a local plumber, if any. (we live in the foothills and nearest 'town' is about an hour away). If I can use PVC coming out of the ground that is great as easier to use for all the above ground fitting I need to make (for ball valves, sediment filter, etc. )
 
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