What is the minimum separation distance between sanitary sewers and private water system wells?

• A. 5 meters
• B. 10 meters
• C. 15 meters (50 feet)
• D. 20 meters

Answer: (C)

The main idea is to protect a private water well from potential contamination by keeping it at a safe horizontal distance from sanitary sewers. Sewage lines can leak or release contaminants, and groundwater can transport those contaminants horizontally if the well is too close.

The minimum separation is 15 meters (about 50 feet). This distance provides a practical buffer that reduces the chance of sewage-related contaminants reaching the well through groundwater or soil movement, helping ensure the well water stays safe to drink.

Smaller distances, like 5 or 10 meters, would offer less protection and increase contamination risk, while a larger separation, such as 20 meters, is not required by the minimum rule—it's simply more than the minimum.