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How To Determine Well Casing Diameter

Get-A-Quote Question 3: Well Casing Diameter

Providing a diameter measurement to us that is precise helps us to ensure an installation with no surprises.

How to Measure

Well cap sizes are based on the INSIDE casing diameter. We can easily determine the inside diameter, without removing the well cap.

Measurement method

This calculation works for the most common schedule 40 metal well casing. If you have PVC, the outside diameter will be sufficient information.

  • Take a piece of string or soft (i.e. completely flexible) measuring tape. Wrap around your well casing and measure.

    VERY IMPORTANT: Make sure you measuring your WELL CASING - the metal shaft of your well - NOT the well cap on the top.

  • If string, put flat, with same degree of tension on it, and measure. This gives the circumference of your well casing.
  • Divide your well casing circumference by 3.14. The result is the outside diameter.
  • From this number, subtract 5/8". The result in your inside diameter - your well cap size.


Your result should be close to one of the standard sizes - 2, 4, 5, 6, 7 or 8 inches.


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1140 Amarillo Drive, Gardnerville, Nevada 89460-7504