New Hampshire Well Data › Merrimack County

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

Name: Merrimack County, New Hampshire water well statistics
Creator: New Hampshire Well Data
License: https://creativecommons.org/licenses/by/4.0/

✓ 13,027 NHDES records · verified 2026-10-19

345 ftmedian well depth

240 ft–500 fttypical depth range

20 ftmedian static water level

8 gpmmedian yield (12,754 tests)

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How deep are wells in Merrimack County, New Hampshire?

The median drilled well depth in Merrimack County is 345 ft, based on 13,019 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.

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 6,975 measurements.

How much water do wells in Merrimack County produce?

The median tested yield is 8 gpm (middle half: 4 gpm–17 gpm), from 12,754 pump tests. A typical household needs 5–10 gpm.

Drilled depth distribution

0–50 ft 217 50–100 ft 78 100–150 ft 593 150–200 ft 820 200–300 ft 2,803 300–400 ft 2,773 400–600 ft 4,050 600+ ft 1,685

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Well records by ZIP code in Merrimack County

Median depth, water level, and yield for each ZIP code with recorded wells.

Bow (03304) — 1,309 wells, median 360 ft
Contoocook (03229) — 818 wells, median 360 ft
Loudon (03307) — 755 wells, median 330 ft
Hooksett (03106) — 703 wells, median 385 ft
Dunbarton (03046) — 659 wells, median 325 ft
Chichester (03258) — 608 wells, median 305 ft
Henniker (03242) — 595 wells, median 400 ft
Concord (03303) — 587 wells, median 360 ft
Suncook (03275) — 558 wells, median 320 ft
Epsom (03234) — 529 wells, median 300 ft
Pittsfield (03263) — 486 wells, median 305 ft
Canterbury (03224) — 476 wells, median 360 ft
Warner (03278) — 415 wells, median 365 ft
Bradford (03221) — 382 wells, median 393 ft
Concord (03302) — 373 wells, median 340 ft
Franklin (03235) — 366 wells, median 323 ft
Newbury (03255) — 309 wells, median 420 ft
Concord (03301) — 297 wells, median 340 ft
Salisbury (03268) — 291 wells, median 320 ft
Andover (03216) — 241 wells, median 395 ft
New London (03257) — 218 wells, median 405 ft
Wilmot (03287) — 202 wells, median 365 ft
Hill (03243) — 200 wells, median 383 ft
Elkins (03233) — 198 wells, median 365 ft
North Sutton (03260) — 189 wells, median 405 ft
Danbury (03230) — 185 wells, median 405 ft
East Andover (03231) — 182 wells, median 345 ft
South Sutton (03273) — 178 wells, median 400 ft
Manchester (03104) — 176 wells, median 445 ft
South Newbury (03272) — 153 wells, median 320 ft
Concord (03305) — 122 wells, median 320 ft

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.