Connecticut Well Data · USGS NWIS
USGS NWIS well records, searchable by address
Every Connecticut well log is filed with the USGS National Water Information System groundwater site inventory. Those records are public, but they are organized by mapped location and record number — not by street address. We hold 6,179 of them and rebuild the index weekly, so you can start from an address instead.
✓ Verified against USGS NWIS · 2026-08-28
Enter any Connecticut address and we return the wells recorded 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 — $29What a USGS NWIS record contains
Not every filed report carries every field — older records are thinner, and what the state captured changed over the decades. This is the real coverage across all 6,179 records, so you know what to expect before you search.
| Field | What it tells you | Records with it | Coverage |
|---|---|---|---|
| Total depth | How deep the hole was drilled, in feet. | 6,179 (100%) | |
| Mapped location | Coordinates, so the log can be found by address instead of by record number. | 6,179 (100%) | |
| Original log document | A direct link to the USGS NWIS copy of the filed log itself. | 6,179 (100%) | |
| Date completed | When the well was finished and the log filed. | 5,353 (87%) |
How this differs from going to USGS directly
Nothing here replaces the official record, and for a single well you already have the record number for, USGS is the place to go (waterdata.usgs.gov/ct/nwis/gw). What this site adds is the part that is hard from the source data:
- An address is enough. You do not need a record number, a section-township-range, or a latitude to start. 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.
- The neighbours, not just the well. Buyers and lenders care what depth and yield are normal nearby, which means reading many records at once, not one.
- The same statistics everywhere. Median depth, static water level and yield are computed identically in every county, so two counties can actually be compared. The exact filters are on the methodology page.
- The original is always one click away. 6,179 of our records carry a direct link to the USGS NWIS copy of the filed log itself.
USGS NWIS records by county
See all 9 Connecticut counties → · What a Connecticut well log contains →
Common questions
With USGS NWIS — the USGS National Water Information System groundwater site inventory. Every Connecticut driller files a completion report there for each well drilled, and that filing is the authoritative copy of the record. The official site is waterdata.usgs.gov/ct/nwis/gw.
Not directly — well records are filed against a mapped location and a record number, not a mailing address, which is the single most common reason people give up on the search. That is exactly the gap this site fills: enter an address on our free lookup and we return the recorded wells around that point, 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.
No, and it is not meant to be. This is an independent index built from the data USGS publishes, rebuilt weekly. Every well we show links back to its own USGS NWIS record, so you can always open the original filed log. If our copy and the state's ever disagree, the state's is right.
Our current copy holds 6,179 records across 10 planning regions, with completion dates from 1888 to 2011. That is everything USGS NWIS publishes in its bulk record set as of 2026-08-28. Wells drilled before the state's filing requirement — and hand-dug or unpermitted wells — were never filed anywhere, so they are in neither copy.
Searching by address here is free, the same as searching USGS NWIS is free. What we charge for is the compiled property report — every recorded well near one address, with the statistics and the original log links, as one printable document for a sale or a loan file. That is $29.
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 — $29Driller, agent, or inspector pulling these regularly? Unlimited & white-label plans →