The United States is taking innovative steps to address the water shortage through large-scale desalination, transforming ocean water into drinkable water to mitigate drought and protect crops. This technology, once seen as a last-resort solution, is now increasingly integrated into the country’s water supply systems.
Transformation of Ocean Water
By 2026, desalination is no longer perceived as an emergency measure but as an essential part of the water system. With more than 20,000 operational plants globally, the sector continues to expand, albeit with challenges such as high energy consumption, potential emissions, and saline waste management.
The United States, especially on its west coast, faces the issue of freshwater reliability due to decreasing snowfall and reservoir levels. This situation leads to considering ocean water as a regular source to meet urban needs.
In addition to seawater, brackish water desalination is also gaining popularity, as it requires less energy. In 2022, the country’s desalination capacity reached 479 million gallons per day, with Florida and California leading the way.
The Carlsbad plant in California is a notable example, producing nearly 190 million liters daily, representing 10% of the local supply. This type of infrastructure opens possibilities for regional water agreements, such as the one negotiated between Arizona and Nevada.
In the Sacramento and San Joaquin delta, the Antioch desalination plant processes up to 23 million liters daily, ensuring supply during periods of high salinity.
The reverse osmosis process is key to converting seawater into potable water. This method uses membranes to remove salts and impurities, followed by water remineralization to make it suitable for human consumption.
Desalination presents significant environmental challenges. High energy consumption and brine generation, which must be carefully treated, are critical aspects. Additionally, water intakes can affect marine life if not properly managed.
Regulations in California are driving more sustainable technologies, such as mixing brine with wastewater before discharge. Innovative projects, like wave-powered desalination buoys, aim to reduce environmental impact and energy consumption.
Ultimately, desalination can be a crucial tool for cities and agriculture, but it must be part of a broader approach that includes irrigation efficiency and urban water recycling. If implemented with renewable energies and proper waste management, it can be fundamental in adapting to more extreme climates.
