The borehole for most home wells is usually drilled at a diameter between 6 to 12 inches. The drilling method will depend on the geologic formations, the required water yield and the type of drilling equipment used.
Drill rigs are expensive (often over $750,000) and their use requires considerable skill. All wells require casing to protect them from possible contaminants at or near the ground surface. Casing may not be needed for the portion drilled into bedrock. Cushing and Sons uses North American .280″ 6″ Sch 40 steel casing on domestic water wells, the heaviest, most durable used by any well contractor in New England.
Generally speaking, most residential wells in our service area obtain water in the bedrock from an open borehole drilled into the bedrock. Water comes into the well from fractures in the bedrock.