How to Measure Your Well Specs

1. How Can I Measure the Water Level?

Your static water level (often simply called “static level”, “static” or just “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 and the well has filled back up after the last pumping.

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 it for you
You may need your driller to come and do a current measurement. If you are going to have them do the installation, checking your specs would be part of their job.

4. Measuring it yourself

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

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 with a line

  • 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. How Can I Measure the Well Depth?

Your well depth is the distance from ground level to the solid rock at the very bottom of your well shaft.

As with water level, you may be able to get this figure from your well report, from your well company’s records, or by your well company measuring it for you.

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. How Can I Measure the 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.

  • 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.