In which area is saltwater intrusion into depleted aquifers becoming a significant issue?

Saltwater intrusion occurs when seawater encroaches into freshwater aquifers, particularly in coastal areas where groundwater levels are declining due to over-extraction or reduced recharge. This phenomenon can lead to the contamination of drinking water sources and negatively impact agriculture and ecosystems.

Southern California is particularly vulnerable to saltwater intrusion. The region has a high demand for water due to its large population and agricultural activities, leading to significant groundwater extraction from coastal aquifers. As these aquifers become depleted, the natural barrier preventing saltwater from migrating inland diminishes, making the area prone to saltwater intrusion. Additionally, factors such as rising sea levels, exacerbated by climate change, further increase the risk of saline water contamination in these aquifers.

In contrast, while saltwater intrusion is a concern in other regions, the extent and immediate threat posed are more pronounced in Southern California due to its specific environmental and geographical conditions, as well as its reliance on aquifers for water supply.