Which practice is essential for preventing well contamination?

Regular maintenance of pumping equipment is essential for preventing well contamination because it ensures that all components of the well system are functioning properly and are free from defects that could lead to contamination. Proper maintenance helps to identify and rectify potential issues, such as faulty seals or worn parts, which could allow contaminants to enter the well system. By routinely checking and maintaining the equipment, it ensures that the well remains a secure source of safe drinking water, thus protecting public health.

Other practices listed do not contribute positively to well safety. For instance, storing chemicals near the well could increase the risk of those chemicals leaking into the groundwater supply. Using untreated surface water can introduce pathogens and pollutants, while failing to check for leaks in the casing might allow contaminants to seep in undetected. Overall, maintenance is proactive and critical for ensuring long-term well integrity.