Potential well contamination is of particular concern in which soils?

• A. Soils overlying limestone
• B. Sandy areas
• C. Areas with high water tables
• D. All of the above

Answer: (D)

Potential well contamination happens when contaminants from the surface find their way into groundwater and the water drawn by a well. The likelihood and speed of that movement depend on how easily water can travel through the soil and rock.

In sandy areas, the soil is highly permeable with large pore spaces, so water and dissolved pollutants move quickly downward with little natural filtration, making wells more vulnerable. Over limestone, karst features such as cracks and conduits can create direct, fast pathways from surface to groundwater, bypassing much of the soil’s filtering capacity. And when the water table is high, groundwater is close to the surface, reducing the distance and time pollutants have to travel before reaching a well, which increases the chance of contamination.

Because each of these conditions raises the risk, all of the above soils present a concern for potential well contamination.