As sea level rises, coastal cities and towns are growing increasingly concerned that fresh water sources used for drinking water, wastewater treatment, agricultural irrigation, and industry could be fouled by saltwater intrusion. Saltwater intrusion occurs when higher sea level forces saltwater inland at the surface or underground through porous rock and sand. When the salt water reaches fresh water intakes on rivers or underground wells, the fresh water become unfit for human consumption and most other uses.
According to a study published in the Journal Nature, millions of Americans live in coastal communities at risk of losing access to fresh water due to saltwater intrusion. KCRA in San Francisco aired a report last week that examined the threat saltwater intrusion poses to the state’s Central Delta waterways.
As sea level rises, it threatens to push salty ocean water up into delta rivers and estuaries that provide drinking water to 27 million California residents as far away as Southern California. The water is also used to irrigate the Central Valley’s farmland.
Sea level rise isn’t the only contributor to the saltwater intrusion problem. The West’s ongoing mega-drought is also drawing down river levels, which could potentially hasten the inland movement of saltwater from the sea. The only way to prevent this is by releasing more water from reservoirs or the construction of a barrier to block the saltwater, which California is trying on the West False River.
The threat to real estate owners and buyers in all of this is that any community that loses access to fresh water is a community in distress. This could cause real estate values to plummet. Clearly everyone involved in coastal real estate needs to be aware of where their fresh water comes from and how safe it is from saltwater intrusion.