This talk will highlight method innovations in water research using satellite earth observations (SEO) in the Canada Centre for Mapping and Earth Observation (CCMEO) of Natural Resources Canada (NRCan). They include dynamic surface water mapping and modelling for water areas and water volume changes, terrestrial water storage variations, groundwater recharge evolution and storage changes, water extreme events (drought and flood) characterization, and environmental and climate impacts on the water and energy cycles and their feedback. This talk will also introduce the long-term, national scale, data production for the fundamental water datasets that are essential for hydroclimate research and water resources management.