Well Drilling in Hillsborough County, NH

• Coverage includes Amherst, Hollis, Brookline, Milford, Mont Vernon, New Boston, Weare, Goffstown, Bedford, Wilton, Litchfield, Hudson and Pelham.
• The neighboring Rockingham County page covers Londonderry, Derry and the seacoast side.
• New Hampshire's Water Well Board, part of NHDES, licenses drillers and keeps well completion reports.

• New bedrock wells for house lots and teardown rebuilds
• Replacing old dug wells that run low in late summer
• Hydrofracturing a low-yield bedrock well
• Pump, pressure tank and constant-pressure system installs
• Water testing and treatment for a sale or refinance
• Well siting around septic systems on smaller lots

• Local depth: at the USGS median of about 405 ft for wells built since 2000, the site calculator's formula gives $11,625–$30,825 for a complete well. At the all-years 75th percentile (442 ft) it gives $12,550–$33,230, and at the 90th (600 ft) $16,500–$43,500. The calculator's method is depth × $25–$65 per foot plus permit, pump and tank allowances, so it is an estimate.
• Bedrock share: USGS records code 7,792 of the county's wells to bedrock, with a median near 325 feet, against a median near 40 feet for wells in stratified drift.
• Casing: depth to rock and the casing needed to seal into it vary by town, which moves the quote more than the per-foot rate.
• State fees: the Water Well Board rule sets a $100 fee for each well completion report, which drillers usually build into the price.

• Step 1, local rules: New Hampshire has no state construction permit for a private home well, so check your town's building or health office for a local well permit or setback rule before drilling.
• Step 2, licensed driller: the Water Well Board licenses contractors; under the NH Code of Administrative Rules (We 303.02) a rotary drilling contractor pays a $225 annual license fee.
• Step 3, drilling and yield test: the driller records casing, depth to bedrock, yield and static water level, all items RSA 482-B:10 lists for the well record.
• Step 4, report: RSA 482-B:10 requires the record within 90 days of completion, and NH rule We 303.02 sets a $100 fee for each well completion report.
• Step 5, test: NHDES recommends testing private wells for arsenic and other health contaminants after drilling and on a schedule after that.

• Bedrock: most of the county's wells are drilled into crystalline bedrock, where water moves through fractures rather than a continuous aquifer, so two bores on the same street can differ a lot. The bedrock under the hill towns west of the Merrimack is broken by fracture zones that drillers look for. USGS records code 7,792 wells to bedrock, with a median depth near 325 feet across all years.
• Stratified drift: the sand-and-gravel aquifer along the Souhegan and Merrimack river valleys supports shallower wells, and USGS records code 577 wells there with a median near 40 feet.
• Depth trend: wells built since 2000 run deeper in the USGS records (median about 405 feet, n=1,194); ask your driller why, since lot location drives depth more than age.
• NHDES says its tracking program combined test data from more than 23,000 private wells statewide from 2006 to 2020 in a public dashboard, which shows results by town.
• Census ACS puts the median year built at 1978 across about 177,734 housing units.

Amherst · Hollis · Brookline · Milford · Mont Vernon · New Boston · Weare · Goffstown · Bedford · Wilton · Hudson · Pelham