Groundwater Watch Latest News...

  Groundwater Watch News

Tuesday, December 27, 2016

HTTPS/SSL has been implemented for Groundwater Watch. If you are a Google Chrome browser user and don't see the green padlock in the URL text box, or can't see ESRI maps, please review this page for a quick fix:

Thursday, November 3, 2016

A new feature has been added to Groundwater Watch for selected Principal Aquifers, the Composite Water-Level Hydrographs. A composite water level is an average water level calculated from selected wells. The composite groundwater level uses the median annual water level for the period of interest for each index well and then averages all the index wells for the particular year to determine a composite water level. The composite water levels representing the average or mean water level of all the index wells is then presented on a hydrograph. Click here to explore

Wednesday, August 3, 2016

On Monday, August 8, 2016, Groundwater Watch data may be unavailable at times due to the NWISWeb changeover to NWISTS DDL, which implements the new time series ID feature. In order to accommodate the changes, GWW will have to perform a full data reload on Monday morning, followed by the real-time data refresh. In addition to spot data outages, real-time data will not be refreshed until sometime Monday afternoon. This means that the maps and hydrographs will also be late. Please plan accordingly.

Wednesday, February 10, 2016

Groundwater Watch now has a complete set of maps of the Principal Aquifers of the United States with active wells. The maps can be viewed on the main web page located at:

Wednesday, April 22, 2015

We have had reports of slow map-loading and symbol rendering when displaying dynamic ESRI maps, especially with Microsoft Internet Explorer. Web browser performance does vary significantly; if you encounter slow loading, try Mozilla Firefox or Google Chrome.

Tuesday, March 3, 2015

Groundwater Watch now fully incorporates discrete water-level data aging codes in all products, providing the ability to distinguish between provisional and approved groundwater-level measurements in hydrographs and data listings. In addition, median statistics used in Groundwater Watch now include only water-level measurements that are approved.

Thursday, February 5, 2015

The Winter 2014 release of NWISWeb and Water Web Services introduced discrete water-level data aging codes, providing the ability to distinguish between provisional and approved groundwater-level measurements. Groundwater Watch incorporates the new groundwater "lev_age_cd" into the statistical, graphical and plot products that use discrete groundwater levels. Users of the "Download Groundwater levels in text format" and the "Download Groundwater levels in text format of all data types" options should note the change in output format required to serve the new water-level approval status, i.e., aging code.

Wednesday, August 13, 2014

Notice - Groundwater Watch (GWW) will be down from approximately 3:00 pm Eastern Time on Friday, August 15, 2014 until sometime on Saturday or Sunday, August 16-17, due to the relocation of the Reston Information Technology Center, where the GWW server is located.  This means that the weekend refresh of GWW will not take place.  Ramifications include:


1. no new sites (wells or springs) will be automatically added to GWW,

2. no non-real-time Daily Values data edits pushed to NWISWeb will be applied,

3. no station manuscript or vertical datum revisions will be applied,

4. no non-real-time Daily Values will be updated,

5. no new statistics will be computed,

6. no non-real-time Daily Values hydrographs will be generated and

7. no updates to non-real-time color-coded map symbols will take place.


However, starting Monday morning, August 18, 2014, real-time values and periodic water-level measurements will be updated, color-coded map symbols will be updated and hydrographs for real-time wells and wells with new periodic measurements added to NWISWeb will be updated. Non-real-time Daily Values wells will not be to be fully updated until the following weekend.


If you have any questions, please contact Linda Debrewer at (703) 648-5011

Tuesday, July 8, 2014

Groundwater Watch has upgraded the mapping system to interactive ESRI maps at the state, county, and local levels.  The user may select among multiple base maps at the state and county level, and zoom and pan within all maps.  The water level and spring data, statistics, and hydrographs that you’ve come to expect in GWW are unchanged.

Tuesday July 30, 2013

A new 'Principal Aquifers' network page has been added to Groundwater Watch and the existing 'State and Local' networks have been moved to a separate web page. Direct links to both pages that display map thumbnails can be found on the Groundwater Watch home page.


Tuesday, April 4, 2013

Groundwater Watch now converts water-level measurements from NGVD29 to NAVD88 when measurements referenced to both vertical datum codes are served at the same well located in the conterminous 48 states. The converted measurements are used in statistics, hydrographs and data listings. Wells located outside of the conterminous 48 states serving measurements referenced to multiple vertical datums will continue to use their appropriate local vertical datum codes on a per-measurement-basis; statistics and hydrographs will not be displayed for these wells.


Thursday, February 21, 2013

The monthly statistic plots have been upgraded to more accurately reflect the underlying statistics. 'Error bar' style plots for months with more than 4 month-years of record and less than 10 month-years of record now are included, and individual months with less than 4 month-years of record are left blank.  Full percentile color bands for months with 10 or more month-years of record are maintained.


Wednesday, December 12, 2012

The 'View latest data on NWISWeb' feature in the 'Daily Values' section of the site page has been enhanced to point to the NWISWeb unit values page if the well serves real-time data, and to the NWISWeb daily values page if the well serves non-real-time, continuous data. In addition, a link has been added to the NWISWeb daily values with measurements page in the 'Period of Record, All Data Types' section.  


Monday, December 3, 2012

Column sort capability has been added to the "View month/year statistics" report found in the Site Statistics Options section. The report displays the period of record monthly statistics for all approved data for a station.

Monday, September 17, 2012

New site location maps for wells in Puerto Rico and Guam have been introduced to enhance detail.

Tuesday, September 4, 2012

A new version of the site page has been installed that automatically displays the correct network name in the header at the top of the page.

Tuesday, January 17, 2012

New statistical reporting has been implemented which preserves decimal point precision throughout the calculation of percentiles. The results are displayed in the table found in the "Site Statistics" section of the Site Page for each well.

Monday, July 4, 2011

Due to network problems, Groundwater Watch did not fully refresh Daily Values or GWSI data over the weekend. Not all wells/data may be available.

Tuesday, May 24, 2011

Groundwater Watch announces a new feature...

For periodic groundwater data, the 'Download Groundwater levels in text format' option now displays two added fields, 'sl_datum_cd' (Referenced vertical datum) and 'lev_agency_cd' (The agency code of the person measuring the water level).

Sunday, November 28, 2010

Groundwater Watch announces two new features...

1. Dual-axis hydrographs

For wells that have the Altitude of Land Surface component populated, new dual-axis hydrographs show depth to water level below land surface on the left vertical axis and elevation relative to sea level on the right vertical axis.  Wells that do not have the Altitude of Land Surface component populated will continue to display the older single-axis hydrographs.

2. Wells serving multiple parameter codes

Wells that serve multiple water-level parameter codes now display hydrographs and statistics.  Note: statistics are displayed if the well has a sufficient period of record to show either descriptive or percentile statistics.  See the Groundwater Watch "Help" page for more information.

Friday, October 1, 2010

Beginning October 1, 2010, only groundwater daily values (continuous and real-time sites) that are coded as "Approved" will be used to calculate statistics on Groundwater Watch.

*References to non-Department of the Interior (DOI) products do not constitute an endorsement by the DOI.

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