Guam Hydrological Survey
- Established to consolidate, inventory, and evaluate all of the current and historical hydrologic data pertaining to Guam. Site topics include topography, water quality, and karst.
- http://www.weriguam.org/

National Water and Climate Center (U.S.)
- Activities include forecasts of snowpack, streamflow, soil moisture and other climate variables relevant to hydrology and agriculture.
- http://www.wcc.nrcs.usda.gov/