The U.S. Geological Survey has inventoried 6,179 groundwater wells in Connecticut. We show them by location.

Connecticut well logs, made useful.

Every Connecticut groundwater well the U.S. Geological Survey has inventoried and measured — how deep it went and what it draws from — gathered around one location.

✓ Verified against USGS NWIS · 2026-08-28

120 ftmedian well depth statewide

300 ft9 in 10 wells are shallower than this

6,179wells you can look up by location

9planning regions covered

What you can answer here

How deep will my well need to be? Median and range of actual drilled depths near you — not national averages.
What will it cost? Local median depth × published per-foot rates, with the math shown.

These are USGS NWIS records

Every figure here comes from the USGS National Water Information System groundwater site inventory. We index that inventory by location so you can start from an address, and every well links back to its own USGS site record.

What's in a Connecticut well log → · About USGS NWIS →

Buying property with a well — or land you'd need to drill?

See every recorded well near any Connecticut address: the measured depth of every inventoried well around the property, how those depths vary by distance, the aquifer each one draws from, and a direct link to that well's own USGS record — all in one report.

Get the property report — $29

Driller, agent, or inspector? Unlimited & white-label plans →

Well data by county

Capitol Planning Region 2,448 wells · median 135 ft Greater Bridgeport Planning Region 101 wells · median 44 ft Lower Connecticut River Valley Planning Region 795 wells · median 145 ft Naugatuck Valley Planning Region 756 wells · median 78 ft Northeastern Connecticut Planning Region 233 wells · median 100 ft Northwest Hills Planning Region 467 wells · median 142 ft South Central Connecticut Planning Region 632 wells · median 105 ft Southeastern Connecticut Planning Region 358 wells · median 73 ft Western Connecticut Planning Region 388 wells · median 74 ft