LA Restores 43M Gallons Daily of Contaminated Water

Los Angeles is turning one of its biggest environmental challenges into a solution that will provide clean drinking water for up to 400,000 homes.

Mayor Karen Bass and city leaders celebrated the completion of two new groundwater treatment facilities in North Hollywood that will restore up to 43 million gallons of contaminated groundwater every single day. The facilities use advanced technology to remove decades of industrial pollution from the San Fernando Basin, one of LA's most important local water sources.

For years, the basin sat contaminated and unusable, later designated a federal high priority cleanup site. Now, that same water will flow through taps across the city as safe drinking water.

The project directly tackles a critical vulnerability. Right now, LA imports more than 70% of its water from outside sources that are becoming increasingly unreliable as droughts intensify. By 2035, the city aims to flip that number and produce 70% of its water locally.

These two facilities are part of a three-facility program that will collectively treat roughly 92 million gallons per day when the third opens in 2027. That's enough to supply nearly half a million homes annually while reducing dependence on imported water.

The facilities pump groundwater from contaminated areas, treat it to meet drinking water standards, and send it directly into the city's distribution system. Each gallon treated is one less gallon that needs to be imported from hundreds of miles away.

The financial commitment matches the ambition. The state provided approximately $308 million in Proposition 1 grant funding, significantly reducing costs for ratepayers while ensuring the project could move forward.

The Ripple Effect

This isn't just about Los Angeles. As climate change makes water supplies less predictable across the West, cities everywhere are watching how LA transforms a contaminated resource into reliable local supply.

The project proves that cleaning up past environmental damage can become the foundation for future resilience. What was once an unusable, polluted basin is now a critical asset that will serve generations.

Other water districts facing similar contamination challenges now have a roadmap. The technology works, the funding models exist, and the payoff extends far beyond just water security into climate adaptation and community health.

LA's success demonstrates that cities don't have to wait for perfect conditions to act on climate resilience. They can start with the resources they have, even contaminated ones, and build the infrastructure needed for an uncertain future.

Turning on the tap just became a little more reliable for hundreds of thousands of Angelenos, and the water flowing through is truly homegrown.