Research · updated 2026-08-28 · download the county-level CSV
Connecticut Well Depth & Drilling Cost Index
Drilling a private water well in Connecticut means paying by the foot — so the two questions every well owner asks are how deep and how much. We computed both for all 9 counties with enough records to be reliable, from 6,179 official USGS NWIS well records.
Statewide, the median well reaches 120 ft, and a complete system — drilling, casing, pump, pressure tank, and hookup — typically runs $7,200–$12,000. But the county spread is large:
Deepest planning regions to drill in Connecticut
| Planning region | Median depth | Typical depth range | Complete system |
|---|---|---|---|
| Lower Connecticut River Valley Planning Region | 145 ft | 96 ft–227 ft | $8,700–$14,500 |
| Northwest Hills Planning Region | 142 ft | 86 ft–204 ft | $8,520–$14,200 |
| Capitol Planning Region | 135 ft | 70 ft–202 ft | $8,100–$13,500 |
| South Central Connecticut Planning Region | 105 ft | 50 ft–173 ft | $6,300–$10,500 |
| Northeastern Connecticut Planning Region | 100 ft | 35 ft–186 ft | $6,000–$10,000 |
Most expensive planning regions to drill in Connecticut
| Planning region | Complete system | Drilling & casing only | Median depth |
|---|---|---|---|
| Lower Connecticut River Valley Planning Region | $8,700–$14,500 | $3,625–$9,425 | 145 ft |
| Northwest Hills Planning Region | $8,520–$14,200 | $3,550–$9,230 | 142 ft |
| Capitol Planning Region | $8,100–$13,500 | $3,375–$8,775 | 135 ft |
| South Central Connecticut Planning Region | $6,300–$10,500 | $2,625–$6,825 | 105 ft |
| Northeastern Connecticut Planning Region | $6,000–$10,000 | $2,500–$6,500 | 100 ft |
Download the full county table (CSV)
How to read this
- Depth is measured; cost is modeled. Depths are the median of recorded drilled depths per county. Cost applies published Connecticut per-foot drilling rates to that local median depth — a planning estimate, not a quote. Actual bids vary with geology, casing, site access, and water depth.
- Planning regions below 30 records are excluded so a thin sample can't produce a misleading superlative.
- Records are drilling events from the state database, which include some replacement and abandoned wells; deeper planning regions reflect real local geology (bedrock, aquifer depth).
Sources & methodology
- Connecticut well records: USGS NWIS (refreshed weekly; see our general methodology).
- Percentiles (p25/median/p75) computed per county; cost from published per-foot rate ranges applied to the local median depth.
The county table is free to use with attribution to Connecticut Well Data (connecticutwelldata.com). For a specific county, a custom cut, or the underlying records, email — usually same-day.
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