⟁ New Hampshire Well Data field records · 2026 survey

New Hampshire Well Data › Merrimack County

Merrimack County, New Hampshire: well depth, water level & drilling cost

✓ 12,927 NHDES records · verified 2026-08-23

345 ftmedian well depth
240 ft–500 fttypical depth range
20 ftmedian static water level
8 gpmmedian yield (12,657 tests)

How deep are wells in Merrimack County, New Hampshire?

The median drilled well depth in Merrimack County is 345 ft, based on 12,919 wells with recorded depths in the state NHDES database. Half of all wells fall between 240 ft and 500 ft; 90% are shallower than 605 ft. Wells drilled since 2016 have a median depth of 420 ft.

How much does it cost to drill a well in Merrimack County?

Applying published per-foot rates to the local median depth of 420 ft: drilling and casing alone typically runs $10,500–$27,300; a complete system including pump, pressure tank, and hookup typically runs $25,200–$42,000. Actual quotes depend on site access, geology, and casing requirements.

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What is the static water level in Merrimack County?

The median static water level is 20 ft below ground surface (middle half of wells: 12 ft–35 ft), from 6,923 measurements.

How much water do wells in Merrimack County produce?

The median tested yield is 8 gpm (middle half: 4 gpm–17 gpm), from 12,657 pump tests. A typical household needs 5–10 gpm.

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Drilled depth distribution

0–50 ft 218 50–100 ft 77 100–150 ft 592 150–200 ft 819 200–300 ft 2,787 300–400 ft 2,749 400–600 ft 4,015 600+ ft 1,662
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Method: medians computed from NHDES records (NHDES Water Well Inventory, water-supply wells only (test/exploration and closed-loop geothermal wells excluded); depths 0-5,000 ft). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.