The most serious water pollution problem related to groundwater is often considered to be agricultural chemical pollution. This type of pollution typically involves the runoff of pesticides, herbicides, and fertilizers that are used in farming. These chemicals can percolate through the soil and contaminate groundwater sources, affecting drinking water quality and potentially harming ecosystems.
While industrial chemical pollution, radioactive contamination, and oil spills can also be significant issues, agricultural chemicals are prevalent and frequently encountered, particularly in agricultural regions. They have widespread impacts on health, the environment, and water quality over large areas.