Minimum well clearance distance from a well to a leach field?

• A. 50 feet
• B. 25 feet
• C. 10 feet
• D. 75 feet

Answer: (A)

Protecting a drinking-water supply from septic waste is the key idea here. A leach field releases septic effluent into the soil, and contaminants can travel with groundwater toward a nearby well. Setting a minimum distance creates a buffer so soils and natural dilution reduce the chance that pathogens, nutrients, or chemicals reach the well intake. Fifty feet is the standard minimum distance used in this context because it provides that practical setback under typical soil and groundwater conditions. Closer distances, like twenty-five or ten feet, would offer too little protection, increasing the risk of contamination, while a larger distance, such as seventy-five feet, is more conservative than the typical minimum, though some situations might justify more distance based on soil, depth to groundwater, or local regulations.