What is drawdown?
Drawdown is the distance a water level drops in a well from its static level when the pump is running.
Drawdown refers to the drop in water level inside a well while the pump operates. It's measured as the vertical distance between the static water level (the level when no pumping occurs) and the pumping level (the level during active pumping). As water is pulled out faster than the aquifer can naturally replenish it, the water column inside the well drops.
For wells in Bonner County, drawdown matters because it directly affects pump performance and well sustainability. Excessive drawdown can indicate an aquifer that recharges slowly or a pump moving water too aggressively for the available supply. If drawdown reaches the intake of the pump itself, the pump will lose prime and stop functioning. It also signals whether a well can sustain the demand placed on it over time.
Well contractors monitor drawdown during testing and operation to confirm the well is properly matched to its pump and the property's water needs. Seasonal variations in groundwater levels in northern Idaho can shift drawdown throughout the year. Understanding this measurement helps property owners and well pump repair professionals diagnose performance issues, size replacement pumps correctly, and plan for maintenance before problems emerge.