Among the many environmental resources, water is regarded as the most essential to humanity. Ironically, water is largely threatened by social changes such as unplanned consequences of activities that cater to a rapidly growing population, or by natural events such as under the whims of climate variability. In the Philippines, Laguna de bay is the largest and among the most important freshwater lakes. While it has been mainly designated for fisheries activities, its waters were likewise collected and used for drinking, industrial cooling, irrigation and electricity production. However, due to the increase in industrialization and population in the area, as well as the constant risk to flooding, a considerable decline in both quality and quantity of the lake water has posed the question of water and food (fisheries) security. To present a world view of securing humanities and environments, a case study was conducted in Laguna de Bay. A great deal of this was tied at maintaining a desired level of ecosystem service by identifying and managing threats caused by significant social and natural processes. The approach consisted of operationalizing the security concept by using indicators and contributing to a more feasible and procedural assessment of a human- environmental system.