Bangkok has been experiencing a significant reduction in groundwater since the 1960s. Several reports have indicated that rapid development and climate change are the most likely causes of groundwater loss due to a decrease in the recharge of shallow aquifers. However, groundwater has also been affected by non-climatic factors such as industrial growth, population increase, a reduction in surface water resources, and land-use change practices. The high level of groundwater consumption in Bangkok and its vicinity has created adverse economic and environmental challenges like the continuous decline in the potentiometric surface of pumped aquifers, and water quality degradation by saltwater intrusion (Buapeng and Wattayakorn, 2008).