A third of the world’s population uses groundwater as its source of drinking water. It can be a pure water source, though localised anthropogenic contamination from agriculture, industry, mining is increasingly common. Natural in origin, arsenic and fluoride are the most prevalent chemical contaminants in groundwater that affect human health on a global scale. It is estimated that over 300 million people are exposed to these chemicals through their drinking water.
We aim at combating this problem by facilitating the exchange of data and information through the online Groundwater Assessment Platform (GAP).

Under GAP Maps you can view arsenic and fluoride hazard maps and overlay these maps with climate, geology, socioeconomic, soil, topography and water quality layers.
Please register to get access to all GAP tools. As registered user you can upload and analyse your data (tables, shapefiles, rasters. You have sole access to your data and can share it, by invitation, with individuals, communities or publicly.
For how-to instructions and to discover the full potential of GAP Maps, please see GAP Help.

GAP Wiki is a wiki site where you can find information on geogenic contamination and contribute your own article.
The GAP team has started GAP Wiki with content from the Geogenic Contamination Handbook. We invite all users to contribute articles to GAP Wiki and join online discussions. We’re particularly interested in learning about mitigation options and their application.

Project Manager: Michael Berg, GAPadmin@eawag.ch
Project Coordinator: Joel Podgorski, joel.podgorski@eawag.ch
Eawag
Swiss Federal Institute for Aquatic Science and Technology
P. O. Box 611
8600 Dübendorf
Switzerland