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How to Measure Your Well Specs


Your static water level (often simply called "static level", "static" or just "the water level") is the distance from ground level down to the water in your well. It's the "resting" level of water --- i.e. when you are not pumping and haven't pumped recently.

The static water level can come from:

1. From your well driller's report
If you have one from when the well was initially drilled.

2. From your driller's records
If you don't have the well report, your driller may have records.

3. Your driller measuring
You may need your driller to come and do a current measurement.

4. Measuring it yourself

To determine your static water level yourself, you'll need

  • A small steel weight, e.g. a nut
  • A fishing float
  • Fishing line or string.

Measuring it yourself is the last choice. You need to have a pitless well, so you can remove the well cap safely. You also need to KNOW that is okay for your particular style of well. And because there's a possibility you could get the line caught down the well.

How to Measure

  • Attach the weight to the end of the line or string. Attach the bobber one inch above the weight.
  • Remove the well cap and lower the weighted end with bobber into the well casing.
  • When the bobber reaches the water level, the line will go limp. You'll feel a slack in the line.
  • At the point where you feel the slack, mark the line at the top edge of the casing (you can tie a small knot in the line, use tape or a marker)
  • Pull the line back up from the casing.
  • Measure the length of the line from the bobber to the marked line. This is your static water level.

2. Well Depth

Your well depth is the distance from ground level to the solid rock at the very bottom of your well shaft.
To determine your static water level yourself, you'll need

  • A small steel weight
  • Lightweight fishing line or kite string.

If you previously measured the static water level, you can use the same line. Just remove the bobber from the line.

How to Measure

  • Lower until you feel slack.
  • Mark the line at the top edge of the casing.
  • Pull out and measure. This is your well depth - the distance to the bottom of the well shaft.

3. Well Casing Diameter

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

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 flexible measuring tape. Wrap around your well casing and measure the circumference.
    VERY IMPORTANT: Make sure you measuring your WELL CASING - the shaft of your well - NOT the well cap on the top, or any collar at the top, just below the well cap.
  • Divide your 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, 4.5, 5, 6, 6.25, 7 or 8 inches.



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