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Authorities may also want to consider avoiding building infrastructure such as schools, fire stations and wastewater treatment plants in areas “that we’ve shown are likely to become in the flood plain,” Dura said.

The Boring Company initially planned to dump wastewater in the nearby Colorado River but, after local pressure, signed a deal to send the sludge to a Bastrop wastewater treatment plant.

They’ve said the state should instead bolster water supplies by upgrading aging levees in the Delta and investing more in recycling wastewater, capturing stormwater locally and making other improvements to use water more efficiently.

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.