Open water evaporation from reservoirs and lakes is becoming increasingly important for water management under a changing climate and increasing demands from growing populations. Remotely sensed evapotranspiration (ET) data have significantly advanced from MODIS to Landsat to ECOSTRESS. Here, we evaluate remotely sensed open water evaporation from NASA JPL’s ET data production team (e.g., ECOSTRESS) against in situ measurements of evaporation from multiple sites around the world.