The setback from a public water well for an aerobic plant is:

The appropriate setback distance from a public water well for an aerobic treatment plant is specified as 50 feet. This distance is established to protect the quality of public water supplies from potential contamination that could arise from the effluent produced by the aerobic treatment system. A 50-foot buffer helps to minimize the risk of pathogen migration and helps to ensure that any contaminants in the soil do not reach the groundwater that feeds into the public water well.

Additionally, the implementation of these standards is reflective of guidelines provided by health and environmental agencies to safeguard public health and maintain the integrity of drinking water sources. While some might suggest that other distances could be appropriate based on various environmental factors, such as slope or soil type, the established standard is based on empirical research and safety considerations. This makes the 50-foot setback standard a widely recognized and accepted practice in the field of on-site sewage facilities.