Frequently Asked Questions
How can I obtain information about test holes and observation wells that have been drilled in the state?
The Geological Survey Program maintains a database of test holes and observation
wells. This database contains information for more than 32,000 test holes and
observation wells across the state. If you want to know what is available in any
specific location, you can contact the Geological Survey Program and request
site-specific information, or visit the
Test Holes and Wells page to view a map.
Are there any maps showing the location of the aquifers near my land?
The Geological Survey Program publishes reports that describe the geology and
hydrology of the state. These reports contain maps and figures
that show the locations of the aquifers. These reports can be obtained by
contacting the Geological Survey Program.
How many earthquakes have been recorded in South Dakota?
Eighty-seven earthquakes have been recorded with epicenters in
South Dakota from the years 1872 through March 2012. The first
one to be recorded was about 25 miles north of Pierre in February of 1872.
The most recent was a 3.0 magnitude (Richter scale) quake in
Shannon County in January 2012. View our
Earthquakes page
to see the locations of recorded earthquakes in South Dakota.
Are there any oil and gas wells in South Dakota?
Yes, there were 147 oil wells and 58 gas wells in production as of October 1997.
Oil was first discovered in Harding County in 1954, with later discoveries
as far east as the Lantry Field in Dewey County and as far south as Fall River
County. More information can be found on the Minerals and Mining Program's
Oil and Gas Section website.
How do I obtain reports and maps from the Geological Survey Program?
Reports and maps can be ordered directly from the
Geological Survey Program. A document listing all of the Geological
Survey Program publications is available in paper format at no charge and is
available for free download.
The Geological Survey Program is an Earth Science Information Center.
This means we are an authorized dealer of U.S. Geological Survey maps and other products.
The Geological Survey Program has an inventory of all topographic maps of the
State of South Dakota.
I just purchased land in the Black Hills. How do I develop a good quality water well and how deep will it need to be?
A person should always check into the potential water supply before purchasing the land.
In some areas, the water bearing materials are very deep and it is expensive
to drill for water. Other areas may have water quality problems or may not
yield sufficient quantities of water to supply a household. Check with the
Geological Survey Program for specific site information.