Maryland Well Data › St. Mary's County

St. Mary's County, Maryland: well depth, owners & drilling cost

Name: St. Mary's County, Maryland water well statistics
Creator: Maryland Well Data
License: https://creativecommons.org/licenses/by/4.0/

✓ 1,026 USGS NWIS records · verified 2026-08-27

350 ftmedian well depth

280 ft–435 fttypical depth range

931 ftmedian depth since 2016

How deep are wells in St. Mary's County, Maryland?

The median drilled well depth in St. Mary's County is 350 ft, based on 1,026 wells with recorded depths in the state USGS NWIS database. Half of all wells fall between 280 ft and 435 ft; 90% are shallower than 560 ft. Wells drilled since 2016 have a median depth of 931 ft.

How much does it cost to drill a well in St. Mary's County?

Applying published per-foot rates to the local median depth of 350 ft: drilling and casing alone typically runs $8,750–$22,750; a complete system including pump, pressure tank, and hookup typically runs $21,000–$35,000. Actual quotes depend on site access, geology, and casing requirements.

Get quotes from drillers active in St. Mary's County

Free for property owners. We route your request only to licensed drillers who actually file well logs in St. Mary's County — never sold elsewhere.

Pull every recorded well near a St. Mary's County address — $29

Drilled depth distribution

0–50 ft 123 50–100 ft 1 100–150 ft 1 150–200 ft 2 200–300 ft 199 300–400 ft 357 400–600 ft 268 600+ ft 75

Looking at a specific property in St. Mary's County?

See every recorded well near any address — depths, owners, drillers, original state well records — in a one-time report.

Free lookup Property report — $29

Method: medians computed from USGS NWIS records (USGS NWIS groundwater inventory, water-supply wells only (monitoring wells, test holes and injection wells excluded), and only wells carrying a measured depth). Cost estimate applies published per-foot ranges (checked 2026-06-11) to the local median depth — full methodology & sources.