Which facility is associated with the 400-foot separation requirement from a well?

• A. A POWTS dispersal component with design capacity less than 12,000 gpd
• B. A residential house
• C. A park
• D. A grocery store

Answer: (A)

The 400-foot setback from a well is a protection rule tied to small private on-site wastewater systems. Specifically, it applies to a POWTS dispersal component with a design capacity under 12,000 gallons per day. The idea is to create a large enough buffer between a drinking water well and nearby wastewater discharge so contaminants in the effluent have less chance of reaching the well. Smaller systems (those under 12,000 gpd) are considered in this particular setback rule, whereas other facilities like a residential house, a park, or a grocery store aren’t defined by this exact 400-foot criterion in the same way. So the correct association is with the POWTS dispersal component of a small capacity, which is why that option is the best choice.