Serinol, Solutions et équipement de traitement des eaux

California: Turning wastewater into drinking water

Every year since 2012, southern California has been experiencing increasingly severe droughts. To protect the precious resource as best possible, we have to accept that we must reuse it. The obstacle for residents is, above all, in their minds. The idea of drinking water from toilets used to be unthinkable for many people, but now, this “yuck factor” is no longer a barrier.

Another summer of drought in southern California. The climate crisis is unprecedented and every year, the same bans on watering crops, washing cars, and filling swimming pools come back. The state consumes 150 billion litres of water per day and the water reserves are becoming increasingly limited. Every spring, those in charge of water management meet up at the Echo Summit, a ski resort north of San Francisco. They measure the depth of the snow to predict the water supply for the summer. In 2010, at an altitude of 2,000 metres, there were three metres of snow. In 2022, the ground was bare. Melted snow makes up 60 % of the water supply in California. This is the worst drought in 150 years.

Californie, traitement des eaux usees, vallee de salinas, irrigation, comte de Monterey
Irrigation watering system, Salinas Valley, Monterey County, California

Drastic water restrictions

Inspection patrols are deployed across Los Angeles. Lawns can only be watered twice a week for eight minutes. If these rules aren’t followed, residents can be given a verbal warning, and if they break the rules again, their water supply may be reduced. The aim of the authorities is to restrict residents’ consumption of drinking water to 300 litres per day, if necessary, using flow limiters installed on the water meters. The lavish properties of American stars have come under fire. Kim Kardashian and Sylvester Stallone are having to resort to watching their lawns turn yellow.

Gavin Newsom, the Governor of California, has announced that the state will lose 10 % of its water resources over the next 20 years.

Road Signal, California

The “Yuck factor”

This tense situation has had positive effects on Californians’ refusal to drink recycled water, also known as the “Yuck Factor”. The West Basin Municipal Water District manages water for 17 towns in California, including Beverly Hills. In 2015, a new wastewater treatment plant was opened. It has the capacity to supply 300,000 cubic metres of five types of water per day, from industrial use to drinkable tap water.

Drinking water from soiled water

The drinking water produced essentially undergoes three treatments. The wastewater is firstly filtered with microscopic sieves. It is then purified using reverse osmosis. This treatment is a special kind of filtration that uses the weight of the water to force it through specific filters. A specific membrane is used for each type of particle that needs to be removed. The water is also treated with ultraviolet light. This removes pathogens, viruses, and bacteria and prevents micro-organisms from spreading. The water produced by the West Basin Municipal Water District is actually so pure that mineral salts have to be added to make it fully drinkable.

Traitement des eaux usees, systeme de filtration, californie, station d'epuration
Water filtration system, California

The psychological barrier

Those in charge are using the drought emergency to promote recycled drinking water. To raise awareness, visits to these infrastructures are organised every week and they are open to schools. A stainless-steel sink with a large tap sits right next to the processing line and on every visit, everyone is invited to taste the quality of the water. Of course, the staff at the plant lead by example each time. Even if mindsets are changing, most of the drinking water produced by this treatment plant is not put directly into the drinking water grid. It is sent to groundwater tables, aquifers, or even lakes. It will take six months to come out of people’s taps. However, the need for water and the recurring droughts may well accelerate this process.

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