What causes sand coming from a well?

Sand coming from a well is typically caused by the disturbance of loose sediment in the surrounding aquifer, which can occur due to over-pumping or a drop in the water table. When water is drawn from the well, it can create a vacuum effect that pulls in sand and silt along with the groundwater. Additionally, if the well's screen or casing is damaged or improperly installed, it can allow sediment to enter the well. Maintaining proper well construction and management is essential to minimize this issue.