Hand pumps, unlike electric pumps draw from the top of the water not the bottom of the well. Static water level is defined as the distance between the ground and the top of the water in your well. To determine your static water level, drop a weighted nylon string into the well casing until you hear it or see it splash the surface of the water. Mark the string where it lays on the top of the well casing. Pull the string out and measure with a tape measure from your mark to the weight on the other end of the string.
When the static water level is GREATER than 25′ feet, then you must use a deep well hand pump; as these pumps lift water (not suction like a shallow well pump). Deep well hand pumps can access great depths, but the further down you install the cylinder, the more water you are lifting. This means it will be harder to pump.