how to place well pump depth static water level
1 You'll feel a slack in the line. 2  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). 3  Pull the line back up from the casing. 4  Measure the length of the line from the bobber to the marked line. 5  This is your static water level.