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You are here: Home > Sprinkler School™ > Parts and Components > PVC Pipe And PVC Fittings > How To Replace Your Water Supply Line
How To Replace Your Water Supply Line

How To Replace Your Water Supply Line

PVC - Parts and Components

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Girl drinking water out of glass.

If you are considering doing repairs on your main water supply line, it is important to contact your homeowners' association or water supplier, as many areas require you to obtain special permits before doing any work on your main water line.

The main water supply line provides all the water to your house, including drinking water, so it is crucial to keep dirt out while you are working on it. Once you complete the project, make sure you turn on all of your water faucets for several minutes in order to flush out all debris.

Use the diagram to identify the different parts of your water supply line, including the corporation stop, which is the boundary between your supply line and the water supplier's line. If the pipe needing repairs is not on your side of the corporation stop, contact your water supplier and have them provide the repairs.

Main Water Supply Line Example.





  • A) water main line

  • B) service line AKA "Gooseneck"

  • C) corporation stop

  • D) Supply Pipe

Should you add a second pipe or replace the original?

If your water meter is installed right next to the corporation stop, or you don't have a water meter:

  • You can tap into the existing water supply pipe right after the water meter. Then install a new larger size pipe. The pipe leading to the sprinkler system would be the "new" supply line, using the revised gpm from the table below. The existing line and flow to the house would remain unchanged. Only the sprinkler system would be affected.
  • OR you can tap into the existing supply pipe rigth after the corporation stop/water meter and install a new second pipe to the house parallel to it. About a foot out from the house, connect the new pipe back into the old, smaller pipe leading into the house. This creates two supply pipes side-by-side to the house, with water flowing through both. This method can sometimes create problems, therefore, it is not recommended by most professionals.
  • OR remove the existing water supply pipe between the corporation stop/water meter and the house and replace it completely with a new, larger pipe. About a foot out from the house connect the new pipe to the old, smaller pipe leading to the house like the method above. This is the most commom method used.


Water Meter Size
New Replacement Pipe Size
Maximum Available GPM when a new supply pipe is installed
Using new SCH 40 PVC supply pipe
Using new PE (SDR-7) supply pipe
Using new Type L copper supply pipe
Using new PEX supply pipe
5/8" 1" 15 GPM 15 GPM 15 GPM 15 GPM
3/4" 1" 17 GPM 17 GPM 17 GPM 17 GPM
3/4" 1 1/4" 20 GPM 20 GPM 20 GPM -
1" 1 1/4" 33 GPM 32 GPM 27 GPM -
- The Do-It-Yourself Sprinkler Store -
 
   
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