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Look up
groundwater and well data.
groundwater research.
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Look up groundwater data

To learn about the likely quantity and quality of groundwater in a geographic area, you’ll want to find data from several sources.

Groundwater quality and basic well parameters

Groundwater quality and basic well parameters can be found in the Groundwater Retrieval Network (GRN).

Local well testing data can be viewed using the Wisconsin Well Water Quality Viewer [exit DNR].

Private well construction information (well records)

Well construction information, including geology, construction method, well depth, water depth, well yield and other information about the well can be found using one or more of the well records search methods below.

Search private well records

Read this before you begin your search
  • All Well Construction Reports (WCRs) for private wells in Wisconsin are stored in two online databases. You can access these databases using the links below, and follow the tips to search for a report. Well Construction Reports are sometimes called well logs or well records.

  • DNR staff use the same online databases, which contain all the private well WCRs that DNR has on file. No separate or additional paper reports are stored elsewhere. Well contractors, inspectors, realtors and private well owners also use these databases to look for WCRs.

  • You are the best person to search these databases, since you have the most information about the property.

  • If you don’t find the report you are looking for, most likely there is no report on file. Depending on the age of the well, a report may not have been submitted. Some older WCRs do not contain enough location information to match the well with a current property address, so it may be helpful for you to try and match a past homeowner’s name with the name on a well record. If no well record is found, you can ask your well professional to measure the depth of your well, well casing and water level, along with the well coordinates and address. This information can then be reported to DNR. DNR will then create a well inventory report and assign a Wisconsin Unique Well Number (WUWN) for your well. If a well was drilled within the last two months, the Well Construction Report may not be in the database yet. WCRs for public water supply wells are not available online for security reasons.

Well construction reports FAQ
  • How can I find out how deep my well is?
    • Search the databases to find the Well Construction Report for your well. The report will indicate the drillhole depth and the casing depth. If you cannot find a Well Construction Report for your well, you can hire a licensed well professional to inspect the water supply system and measure the well depth for you.

  • Where do I find my Township/Range/Section information?
    • You can find this information on your property tax bill, in a plat book from your county, or click on the map in the database where your property is located.

  • How can I locate my well construction report in your database using my tax parcel number?
    • Well Construction Report databases do not use tax parcel numbers. Try entering other property information into the search boxes, or click on the map to find the Township/Range/Section for your property.

  • How can I find out my well yield or how many gallons per minute (gpm) of water supplies my house?
    • A Well Construction Report will only indicate the gpm of the initial test done when the well was drilled. You can hire a licensed well professional to inspect your water supply system and determine the current gpm or yield.

  • Where can I find a list of licensed well professionals in my area?
  • Where can I find information about the drinking water quality in my well or in an area of the state?
    • The Well Construction Report may include sampling results from when the well was constructed. You can look up information in other databases available on drinking water data page. You can also test your private well by collecting a sample and having it analyzed by a certified laboratory.

  • I am buying/selling property and have questions about a well inspection.
  • More questions?
    • If you have additional questions or technical difficulty using the databases, please email your question to DNR PrivateWellReport.

To locate records on file since 1988, search this database:

Tips for searching the Well Construction Reports on file since 1988 database

You can search by entering information or search the map.

Search by Entering Information

  • The best search results come from entering a limited amount of data.
    • If you have the WI Unique Well No (WUWN), search using only that number. The WUWN is the unique identifier of a well - for example: AB123 or WZ568
    • If you have a Township/Range/Section, search using those coordinates
    • If you have a property address, search by choosing the county and entering a portion of the street name only.
      • For example, for 123 West Birch Tree Way in Door County, enter: County: Door, Address: birch
    • Whatever criteria you use, note that different spellings, abbreviations and/or spaces may not give you a result. Also, older records may not always have a fire number or house number - for example: Route 1, River Road


Search the map

  • Zoom in to your well area using the + sign on the map and click the map on your well location
  • The PLSS description for your well will appear in Section/Township/Range format (for example [11 21N 04E])
  • Click Continue Search button at the upper right side of the screen
  • You will be taken back to the Information page

To find results of either search method above:

  • Scroll to bottom of the Information page
  • Click Retrieve Records button
  • The search results will appear in a table

To view and/or print:

  • To view Well Construction Report data, click on the WI Unique Well No (WUWN) link for the line you want to view
  • If this is not the report you are looking for, use the Back Arrow to return to the table of search results
  • To print, click on the Printer Friendly Version link

To locate records on file prior to 1988, search this database:

Tips for searching the Well Construction Reports on file from years prior to 1988 database

Search the map

  • Zoom in using the + sign until the well symbols are visible
  • Click on the symbols near your property (look at all symbols within ½ mile)
  • Click on the link that appears for an image of the well construction report
  • Several well construction reports may be associated with a single symbol


Search tab

  • Select your search in the pull-down menu
    • Public Land Survey: use Township/Range/Section format (for example, [21N 04E 11])
    • Coordinates: Latitude/Longitude in Decimal Degrees
    • County

About tab

  • Review important information explaining the well data on the WGNHS website

How to tab

  • Review the helpful general steps & notes

Well abandonment reports

High capacity wells

Groundwater levels

Groundwater levels measured in approximately 120 wells throughout Wisconsin, are available at the USGS web site:

Potential contamination sources

Potential contamination sources, including spill or remediation sites:

Additional groundwater data and analyses

Additional groundwater data and analyses available from:

Public water supply system well information

Construction reports and exact locations of public wells and high capacity wells are not available online for security reasons. If you need more detailed well locations, contact the Water System Security Officer.

Last revised: Tuesday August 14 2018