A well casing is the wall of the well. It protects the well’s vertical length that sinks down to the groundwater. The most common materials for well casing are concrete, carbon steel, plastic, and stainless steel. Local geology often dictates what type of casing can be used. Concrete is a stable, long lasting solution for wells in the Comox Valley. Concrete well caps are placed on top of the well casing to prevent debris, insects, or small animals from getting into the well.