About
The Northern Guam Lens Aquifer (NGLA) is Guam’s major source of utility water, from which military and government of Guam draw up to 90% of the island’s potable water. As we continue to develop above and increase demand of utility water from this water source, we need to be careful. And we need more detailed information and availability of map products that can help strategize development. The NGLA Maps is the main source collection of useful spatial information obtained as an individual GIS shapefile or a blend of map layers that will be the most useful information for optimum development concerning our most valuable resource.
Updates
Last updated in 2021.
Web Map App
See some of the viewing options of the map below:
Mobile View
Desktop View
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Downloadable Map Content
Click on one of the tabs below to view a list of shape files or raster files available for you to download.
Basement topography | Elevation contours, meters, Vann, Bendixson, Habana 2018
Basement contours | Select contours 0, -20, -40 meters
Saltwater toe extracted from groundwater model | No pumping, 50% isochlor, Gingerich 2014
Aquifer basins 2021 | Basement and flow line delineation, from Gingerich 2013 model
Water table contours | No pumping condition, from Gingerich 2013 model
NGLA Map 2021 | Basic shapefiles package
