DNR Groundwater Retrieval Network
Welcome to the Groundwater Retrieval Network (GRN)
This system reports data from the Department's Public Water Supply
(public drinking water supply wells), Private Water Supply (private
drinking water supply wells, non-point source priority watershed projects,
and special groundwater studies), the Bureau of Waste's Groundwater and
Environmental Monitoring System (GEMS) (landfill wells) and the Bureau
of Watershed Management's System for Wastewater Applications and Monitoring
Permits (SWAMP) (wastewater treatment facilities and land spreading sites).
Data covers the period from the early 1970s to present for the Public Water
Supply data; 1988 to present for the Private Water Supply data; from the mid
1970s to present for the GEMS database; and from the mid 1970s to present for
the SWAMP system. The SWAMP data must undergo review from the facilities and
only previously reviewed data is available. Not all programs which currently
generate groundwater related data are linked into the GRN system. Data from the
Bureau of Remediation and Redevelopment (LUST, spills, or remediation sites) is
not currently retrievable through the GRN system.
At any time, you may click the "Help" button at the
top of a page to get the glossary of terms and the list of
acronyms and abbreviations for more information explaining terms
used in the GRN files.
GRN Query Limits Notice! (03/06/2006)
GRN web retrieval mechanism will be limited to returning no more than 10,000 records per retrieval.
You will get a error message if the search criteria returns more than 10,000 records.
Please use additional search criteria options to reduce the number of records per retrieval.
GRN redesign updates! (03/22/2005)
- Data included in eq_sample_point in GRN include - Public Wells, Private Wells,
GEMs (Monitoring wells), springs, Surface water sources of drinking water, Out of state wells,
and Wastewater Monitoring wells. Because some of these are not wells, the generic term "
sample points" is used.
- The locational data source table (eq_sample_point) in GRN was replaced with a SDE
point feature class (spatial GIS layer) that identifies wells and locations. This feature
class has WTM coordinates in it that can be used for mapping purposes. In addition it has
calculated values for other locational fields (lat./long, PLSS, county, GMU, etc.). The goal
is to have this be the single place where locational information about these sample points is managed.
- A Wisconsin Unique Well Number (WUWN) is no longer required for GRN so those wells or sample
points with no WUWN will be included in the locational table.
- When a new location is received from any one of the systems, the new value is recorded in a
"holding bin"(logged). From there, it is determined it is determined whether or not the
value is more accurate than the existing best value. If it is, WTM coordinates are calculated and
updated in the feature class. If it is not, it is stored but not displayed explicitly.
- A version of the data was created that matches the structure of the old eq_sample_point
so that applications that use it do not have to be changed immediately.
- The wells and other sample points are tied to "DNR Interests". This information allows
users to query wells based on a particular interest that the DNR might have. For each well or sample point,
you can see which DNR programs have collected samples or reported data. The information states the DNR program
that is interested and provides a link (url) to a program's web page if available.
Search the Well Inventory
Search by Well Owner/Operator Name
Analytical Data - Sample History Report
Sample Analytical Data - Sample Summary Count Report
GRN Glossary of Terms and
If you have questions or comments regarding GRN or this website please contact
by phone (608) 266-2955 or e-mail firstname.lastname@example.org