The three most common types of private drinking water wells are which?

The three most common types of private drinking water wells are which?

• A. Dug, driven, and drilled
• B. Piezometer, borehole, and driven
• C. Shallow, mid-depth, and deep
• D. Driven, shallow, screened

Answer: (A)

Private drinking water wells are most commonly categorized by how they’re constructed. The three typical residential types are dug wells, driven wells, and drilled wells. Dug wells are large-diameter and relatively shallow, formed by excavating into the ground and lining the hole to prevent collapse. They were common in older rural areas and provide quick access to shallow groundwater. Because they’re shallow, they’re more exposed to surface contaminants and water quality can be variable. Driven wells use a narrow casing that is driven into the ground, usually reaching shallow aquifers. They’re simpler and cheaper, but their depth is limited and protection from surface contaminants depends heavily on proper sealing and location. Drilled wells are created by drilling deep boreholes and installing a casing and sealing system. This method reaches deeper groundwater, often delivers higher and more reliable yields, and offers better protection from surface contamination, though it is more expensive. The other terms listed don’t describe standard construction types for private wells: a piezometer is a measurement device, borehole is a general drill hole not specific to a well type, and shallow/mid-depth/deep describe depths rather than construction styles, while screened refers to a feature inside a well rather than how the well is built.

Private drinking water wells are most commonly categorized by how they’re constructed. The three typical residential types are dug wells, driven wells, and drilled wells.

Dug wells are large-diameter and relatively shallow, formed by excavating into the ground and lining the hole to prevent collapse. They were common in older rural areas and provide quick access to shallow groundwater. Because they’re shallow, they’re more exposed to surface contaminants and water quality can be variable.

Driven wells use a narrow casing that is driven into the ground, usually reaching shallow aquifers. They’re simpler and cheaper, but their depth is limited and protection from surface contaminants depends heavily on proper sealing and location.

Drilled wells are created by drilling deep boreholes and installing a casing and sealing system. This method reaches deeper groundwater, often delivers higher and more reliable yields, and offers better protection from surface contamination, though it is more expensive.

The other terms listed don’t describe standard construction types for private wells: a piezometer is a measurement device, borehole is a general drill hole not specific to a well type, and shallow/mid-depth/deep describe depths rather than construction styles, while screened refers to a feature inside a well rather than how the well is built.