⟁ Connecticut Well Data field records · 2026 survey

Connecticut Well Data · Well logs

Connecticut well logs

Every time a well is drilled in Connecticut, the driller files a completion report — the well log — with well completion reports filed with the Connecticut Department of Consumer Protection (2021–present) together with the USGS National Water Information System groundwater inventory. We hold 10,002 of them and rebuild this index weekly, so you can find one by address instead of by record number.

✓ Verified against DCP + USGS · 2026-10-12

10,002well logs indexed
10counties covered
1888–2026oldest to newest log on file
10,002link to the original filed log
Find the well logs near an address

Well logs are filed by location, not by house number. Enter any Connecticut address and we'll pull the recorded wells around it — These are the wells the U.S. Geological Survey has inventoried in Connecticut — a large sample of the state's wells, not every well drilled — so results show the wells around a location rather than a single wellhead.

Free address lookup Full property report — $49

What's in a Connecticut well log

Not every filed report carries every field — older logs are thinner, and what the state captured changed over the decades. This is the actual coverage across all 10,002 records, so you know what to expect before you look anything up.

FieldWhat it tells youRecords with itCoverage
Mapped location Coordinates, so the log can be found by address instead of by record number. 10,002 (100%)
Original log document A direct link to the DCP + USGS copy of the filed log itself. 10,002 (100%)
Total depth How deep the hole was drilled, in feet. 10,001 (100%)
Date completed When the well was finished and the log filed. 9,172 (92%)
Street address A street address on the filed report (varies a lot by state and era). 3,823 (38%)
Driller The licensed company that drilled the well and signed the log. 3,821 (38%)
Tested yield Gallons per minute the well produced on the driller’s pump test. 3,814 (38%)
Static water level How far below the surface the water stood at rest. 3,613 (36%)

When Connecticut's wells were drilled

Dated logs by decade of completion (9,172 of 10,002 records carry a usable completion date). The shape of this chart is mostly the history of the filing requirement, not of drilling — thin early decades mean the logs weren't kept, not that nobody drilled.

DecadeLogs filed
1880s 1
1890s 1
1900s 19
1910s 77
1920s 135
1930s 216
1940s 291
1950s 1,224
1960s 1,743
1970s 650
1980s 624
1990s 264
2000s 118
2010s 34
2020s 3,775

Three ways to find a well log here

  1. By address — the free lookup maps an address to the wells recorded around it. This is what most people want: "how deep is the well on the place I'm buying."
  2. By county — each county page carries the median depth, water level and yield computed from every log filed there, plus the drillers working it.
  3. By driller — every log names the company that drilled the well, so the 12 Connecticut drillers in our directory each have a profile built from their own filed logs.

Well logs by county

Capitol Planning Region 3,096 logs · median 160 ft Lower Connecticut River Valley Planning Region 1,350 logs · median 225 ft Southeastern Connecticut Planning Region 1,089 logs · median 265 ft Northeastern Connecticut Planning Region 973 logs · median 263 ft Naugatuck Valley Planning Region 955 logs · median 105 ft South Central Connecticut Planning Region 817 logs · median 135 ft Western Connecticut Planning Region 788 logs · median 233 ft Northwest Hills Planning Region 765 logs · median 204 ft Greater Bridgeport Planning Region 168 logs · median 155 ft

See all 9 Connecticut counties →

Where these records come from

All of it is public record from well completion reports filed electronically with the Connecticut Department of Consumer Protection since 2021, together with the groundwater wells the U.S. Geological Survey has inventoried in Connecticut (data.ct.gov/Environment-and-Natural-Resources/Wells-in-Connecticut/wphv-ux6v). We don't hold anything the state doesn't publish. More on that database and what a filed record carries: DCP + USGS well records. What we add is that the records are indexed by location, the statistics are computed the same way in every county, and the whole thing is refreshed weekly. Our filters and the exact computation are on the methodology page (statistics use USGS NWIS groundwater inventory, water-supply wells only (monitoring wells, test holes and injection wells excluded), and only wells carrying a measured depth).

Common questions

Are Connecticut well logs public records?

Yes. Connecticut drillers are required to file a completion report for each well, and those reports are kept by well completion reports filed with the Connecticut Department of Consumer Protection (2021–present) together with the USGS National Water Information System groundwater inventory. Anyone can look them up. This site is an independent index of that public record — we re-read the source and recompute every page weekly.

How do I find the well log for my property?

Well logs are filed by location, not by street address, so you search the map rather than a house number. Enter the address on our free lookup and you'll see the recorded wells around that spot — These are the wells the U.S. Geological Survey has inventoried in Connecticut — a large sample of the state's wells, not every well drilled — so results show the wells around a location rather than a single wellhead. Each one shows its depth, static water level, tested yield, and a link to the original filed log.

How far back do the records go?

The oldest dated log in our copy was completed in 1888; the newest is from 2026. Coverage thins out the further back you go — older wells were often never filed, and filing requirements tightened over time.

Why can't I find a log for my well?

Most likely it was never filed. Wells drilled before the state's reporting requirement — and hand-dug or unpermitted wells — have no log at all. It also happens that a log exists but its recorded location is off, in which case it will show up under a neighboring property. Neither is something we can fix from the source data, and we'd rather say so than invent a record.

What does a well log actually tell you?

The useful parts for a buyer or a homeowner: how deep the well is, how high the water stands in it, how many gallons per minute it produced when tested, what the driller hit on the way down, and who drilled it. Together those say whether the well is likely to keep producing and what a replacement would cost.

Need every log near one property, in one document?

The property report pulls every recorded well near an address — depths, water levels, yields, drillers , and links to each original filed log — as one printable summary for due diligence.

Property report — $49

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