What is required for all wells regarding casing?

Wells are required to be completely cased to the bottom of the usable drill hole to ensure proper function and safety. Casing is a protective tube that is inserted into the wellbore to prevent contamination of the water supply, protect the well from external environmental factors, and maintain the structural integrity of the well. The complete casing minimizes the risk of collapse and helps stabilize the surrounding soil and water. By extending the casing to the bottom of the usable drill hole, it ensures that the entire water-bearing formation is effectively isolated from surface pollutants and other contaminants. This is a critical aspect of well construction, particularly in maintaining water quality and ensuring the well operates efficiently over time.