Internazionali
- International Groundwater Resources Assessment Centre (http://www.un-igrac.org/)
- International Hydrological Programme (UNESCO-IHP) (http://www.unesco.org/new/en/ihp)
- The Groundwater Governance (http://www.groundwatergovernance.org/)
- USGS Groundwater Information Pages (http://water.usgs.gov/ogw/)
- Water Resources Programme (IAEA) (http://www-naweb.iaea.org/napc/ih/index.html)
- World Meteorological Organization (WMO) (http://www.wmo.int/pages/index_en.html)