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Analyzing data for large sewage treatment plants in seven states that rely on Colorado River water, the researchers found California is recycling only 22% of its treated wastewater.

For Windermere that's set to mean nine wastewater treatment works, including two that were included in the campaigners' analysis being upgraded and a reduction in the number of overflows discharging into the lake.

Supporters say gas-fired electricity would bolster Gaza’s overall energy supply and enable major new industrial infrastructure, like desalination plants and wastewater treatment, that would improve everyday life.

Southern California’s water agencies are moving ahead with plans to build new facilities that will transform wastewater into clean drinking water, and have also been investing in projects to capture more stormwater.

In response to the BBC's questions, it says it has efficient wastewater treatment systems and effective contingency plans for oil spills.