What is a major consequence of improper sealing of a well casing?

The major consequence of improper sealing of a well casing is contamination of the well. A well casing is designed to protect the water supply from surface contaminants, such as fertilizers, pesticides, and pathogens, as well as from natural contaminants in the surrounding soil and rock layers. If the casing is not properly sealed, there's a risk that these harmful substances can enter the well, leading to polluted water. This contamination can have serious health implications for anyone consuming or using the water, as it may introduce bacteria, chemicals, or other harmful agents into the water supply. Ensuring a secure seal on the well casing is critical for maintaining the integrity and safety of the groundwater being utilized.