When should water wells be located away from septic tanks?

The recommendation for locating water wells a minimum distance from septic tanks is rooted in the need to protect the water supply from potential contamination. Septic tanks process wastewater, which contains pathogens and pollutants that can seep into the surrounding soil and groundwater.

Having at least a 50-foot separation ensures that there is enough distance for any contaminants to disperse and be naturally filtered by the soil before reaching the well. This distance helps to reduce the risk of bacteria, viruses, and chemicals from septic effluent infiltrating the well water, thereby safeguarding human health.

The other distances suggested, while seemingly safe distances as well, do not align with the generally accepted guidelines for water well placement as recognized in most health and environmental regulations. A distance of 25 feet may not provide sufficient protection, as substances from a septic system can migrate more easily than expected. A distance of 100 feet or 200 feet would certainly offer greater protection but may not be necessary in all situations, and could also impose excessive restrictions without a justified cause in terms of public health and safety. The 50-foot guideline strikes a balance between maintaining safety and allowing for practical well placement.