3 Simple Steps...
Finding the depth to water in your well using a string & weight
This is a simple method that can be done in a few minutes. Use of a thick cotton string permits easier detection of wet string.
Items Needed:
• Tape measure
• Ordinary string
• Fishing weight
Step One – Drop weight and string into well casing
CAUTION Take care putting anything into your well. Don’t use a weight that may get caught on pipes or edges in the well. Use a small fishing weight or a rounded object and tie it carefully.
Tie a small but heavy weight to the end of a piece of string (be sure there is enough string; some wells are very deep). Lower the weight into the well until you feel it touch the bottom.
Step Two – Mark the String
Take up the slack and use a Sharpie or other waterproof marker to mark the string at ground level.
Step Three – Measure
Pull the string and weight out of the well. Pay attention to the string as it is withdrawn and identify the location where the string becomes wet. Mark that point with the permanent marker. Stretch the string and measure from the bottom of the weight to the ground level mark. This is the depth of your well. The normal (or ‘static’) water level is the length of the dry portion of the string up to the ground level mark.
For relatively shallow wells (30' or less), a tape measure may be used directly, but a weight on a string assures that the line used to make the measurement is absolutely straight, thus more accurate.
HERE’S THE IMPORTANT PART: The bottom of your well pump should be 5’ – 10’ off the bottom of the well, and 5’ – 10’ from the surface of the water (10’ is ideal for both).  If not, you probably need to contact a professional to either reposition your pump or deepen your well!