The Brief

The California State Water Resources Control Board on Tuesday approved new regulations for direct potable reuse, AKA "toilet to tap," or highly treated sewage that’s piped directly from a water treatment plant to your home.

Some of the largest direct reuse programs in the state are being developed here in Southern California.

So, when will you be able to gulp down water that’s gone from flush to faucet?

California Gov. Gavin Newsom (R) prepares to taste wastewater that was treated at the Antioch Water Treatment Plant with former Los Angeles Mayor Antonio Villaraigosa (L) and Antioch Mayor Lamar Thorpe (C) on Aug. 11, 2022 in Antioch, California.

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A bit of background

While this might sound like a new development, these regulations have been in the works for more than a decade now. And whether you realize it, there’s a decent chance you’ve already been drinking small amounts of purified sewage water in California.

Indirect potable reuse has been allowed for quite some time. That’s when sewage water is treated, pumped into a reservoir or some other environmental buffer, mixed with natural sources of water and then pumped back out and treated again.

Orange County has had one of these recycled water systems in place since 2008.

“The reality is that anyone out there on the Mississippi River, anyone out there on the Colorado River, anyone out there taking drinking water downstream from a wastewater treatment plant discharge, which I promise you you’re all doing, is already drinking toilet to tap,” said E. Joaquin Esquivel, chair of the California State Water Resources Control Board, during the meeting Tuesday.

Recycled water programs have been ongoing since the 1980s, with the finished product frequently used to irrigate places like golf courses and public parks.

Our water problems have been getting worse each year as a result of higher temperatures and extreme drought conditions exacerbated by the climate crisis. We need to explore alternatives to imported water, which is why recycling is a key part of the state’s water supply strategy.

A view of the lime post treatment section of a water treatment facility run by the Orange County Water District.

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In the near future, toilet to tap could account for as much as 10% to 15% of our supply, according to Darrin Polhemus, deputy director of the division of drinking water for the California State Water Resources Control Board.

Up to 90% of contaminated water streams can be reliably recycled, with the leftover discharge usually sent to the ocean.

The new regulations aren’t the final word on direct potable reuse. Guidance will continue to develop as systems are implemented. And there’s no requirement for localities to participate in wastewater reuse. Any projects that do go ahead should be open for public comment before they’re approved.

Is it safe?

“I would have no hesitation drinking the first glass out of the first potable reuse facility in California,” said Daniel McCurry, assistant professor of civil and environmental engineering at USC. “I think it’s going to be cleaner than most bottled water you could find.”

The new rules require a minimum of four separate treatment processes, ensuring redundancies in case one fails. And the process is monitored from beginning to end. If the water doesn’t pass the necessary requirements, it’s discarded.

A sample of purified water (L) flows next to wastewater following the microfiltration treatment process at the Groundwater Replenishment System (GWRS), the world's largest wastewater recycling plant, in the Orange County Water District.

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Reverse osmosis, UV lights and carbon filters are all part of the filtration process. Helping to pull out and eliminate everything from pharmaceuticals to PFAS, to enteric viruses and protozoa like giardia and cryptosporidium, all of which can cause serious gastrointestinal issues — 99.999999999999999999% (that’s 18 nines after the decimal point) have to be removed. That's a higher degree of purification than is required for indirect potable reuse, which has been in place.

“These are probably the most protective potable reuse regulations that’ve ever been written,” McCurry said. “There’s probably some in the industry who feel like they're too strict, but it’s probably wise for us to err on the side of caution for now.”

City of L.A.

L.A.’s recycled water program is called Operation NEXT, the goal of which is to retrofit the Hyperion wastewater treatment plant so that instead of sending our treated water out into the ocean, we can pump it back into storage systems, including the aquifer beneath the San Fernando Valley.

“It’ll create a new drinking water supply for the city of L.A. leading to sustainability and the development of local supplies. All the things that we know we need here, specifically in Los Angeles, given the climate crisis," said Jesus Gonzalez, manager of recycled water at LADWP.

Besides a retrofit to purification technologies, L.A. will also have to build pipelines all of the way from Hyperion to conveyance facilities.

Gonzalez anticipates that the $20 billion investment should supply roughly a third of the city’s future water supply. That said, it could take another 15-plus years before it’s up and running.

Los Angeles County

L.A. County is partnering with the Metropolitan Water District on a program called Pure Water Southern California, which could be the largest facility of its type in the United States, according Deven Upadhyay, executive officer at the MWD.

They’re currently in the environmental planning stage, and the cost estimate for the first phase of the program is going to be about $6 billion.

“That’s a lot of money in the water world,” Upadhyay said.

We’ll have to wait and see how the new regulations are used, but at least some of the water will be pumped into groundwater basins for storage. Upadhyay didn’t specify how much of our water could be covered by the new system.

Orange County

Orange County has the world’s largest water recycling plant, and has been running their indirect potable reuse program since 2008.

They currently produce about 130 million gallons of recycled water every day, processing all of the available wastewater across the O.C. Sanitation District.

About 40% of what’s put back into the aquifer is coming from their O.C. treatment facility.

“We’re recycling everything we can recycle in terms of taking the treated wastewater, putting it through advanced treatment to a point where it’s beyond drinking water quality, and then putting it back into the underground aquifer,” said Mehul Patel, executive director of operations for the O.C. Water District.

Patel doesn’t anticipate these new regulations will affect the current system they have in place.

However, he said there’s a possibility that O.C. could see changes as a result of the regulations south of Irvine, where they don’t have a lot of naturally occurring water storage areas, leaving them reliant on imported water. They may benefit from a direct potable reuse plant there, though nothing is planned at the moment.

San Diego

By 2035, San Diego wants recycled water to account for half of their supply. Currently, they recycle about 8% of their wastewater, sending the rest out to the Pacific Ocean.

Phase 1 of their Pure Water San Diego project is currently under construction, and is expected to be completed by 2026, providing as much as 30 million gallons of recycled water a day. That water is slated to be sent to the Miramar Reservoir, where it’ll be mixed with other water in the system.

There are no current plans for San Diego to implement direct potable reuse, according to a statement from city spokesperson Ramon Galindo. That could change with Phase 2 of the project.

The Long Beach Unified School District is looking for a new operator to handle a major after-school program following the city of Long Beach’s decision not to participate in an attempt to save money.

Since 2002, the city’s Parks Department has helped anchor the initiative, known to families as WRAP. It provides free programming for hundreds of transitional-kindergarten through eighth-grade students across seven local campuses: Garfield, Edison, King, Grant, Lafayette, Burbank and Herrera.

Long Beach Unified officials stress that the vital student services will continue under a new operator this fall. It’s not clear yet who it will be and what, if any, changes they’ll make.

The city’s quiet retreat from the program has sparked deep anxiety among three full-time and 80 part-time municipal workers who now face potential layoffs.

Workers say they were first notified of the decision during a June 15 staff meeting with a city superintendent, where they were told their employment with the program would conclude on Aug. 15.

“Everybody was kind of caught off guard,” said one 13-year city employee based at an elementary school, who spoke on the condition of anonymity to protect her position. “I mean, again, I’ve been doing this for 13 years; we had people there that had been doing it over 20 years that had never moved sites.”

Today, the before- and after-school services are paid for primarily through the state-funded Expanded Learning Opportunities Program (ELOP), a combination of California’s After School Education and Safety (ASES) grant and specific ELOP apportionments.

Historically, the city was granted this funding by the school district without a formal bidding process, typically receiving roughly $15 per student plus administrative fees, which it supplemented with allocations from its own general fund.

This year, however, the school district was forced to overhaul its grant-funding process and consider bids to meet tightening state mandates for the program’s ELOP funding.

Shortly after, the city informed the school district it would not bid on the program.

City spokesperson Jennifer De Prez said the decision “was made so that the department can focus its limited financial resources” on other programs it runs.

The city is facing an estimated $61 million budget shortfall in the upcoming fiscal year — a deficit that top administrators warn makes citywide reductions inevitable.

The city could not immediately provide numbers on how much money it expected to save by ending its participation in the WRAP program. Last year, the city provided $193,254 of in-kind-services at its own expense on top of the program’s grant-funded budget, according to documents provided by De Prez.

Meanwhile, the school district went ahead with a bid application for a replacement operator on May 22. Proposals were due June 12 and are scheduled to go before the Board of Education for consideration at its July 15 meeting.

District officials emphasized that the state funding remains fully intact and that student services will continue without interruption.

The district and the city are also working on a joint letter to families detailing the transition, which is scheduled to be sent out soon.

But for the frontline staff, the transition has been destabilizing and abrupt.

These part-time employees, who work between 20 and 30 hours per week depending on the season, rotate through campuses where individual site enrollment ranges from 85 to 160 students.

The employee who spoke with the Post said that despite directives from supervisors to keep the changes quiet until future plans solidified, she chose to notify parents so they would have time to prepare.

“As a parent, I would want to know if it’s not the same people that I’ve trusted my kids with for years,” she said.

The long-term fate of the workforce remains unresolved, forcing many to look for employment elsewhere.

“As far as employment opportunities, they didn’t lay us off, they didn’t fire us, they just basically told us the contract with the schools will be done August 15,” the anonymous employee said. “Past that, we have no idea what’s going to happen.”

City officials say they will soon meet with representatives of the International Association of Machinists (IAM) union to discuss the workers’ future.

“We are committed to ensuring this process is transparent, informed by complete information, and focused on protecting both employees and the quality and continuity of the vital services the WRAP program provides to the Long Beach community,” said Sashi Muralidharan, a spokesperson with IAM 947.

Editor’s note: This story was updated with more information about the program’s cost to the city.

A community organization in Los Angeles is criticizing how the FBI enforced a strict no-drone policy around World Cup venues after federal agents disrupted a community gardening event in South L.A.

The incident took place the first Sunday of the tournament, while crowds were watching matches at the FIFA Fan Festival at the Los Angeles Coliseum. Nearby, the Los Angeles Neighborhood Land Trust was hosting a celebration for teenagers who had created a native plant garden on a patch of land that used to be an oil drilling site.

Then someone flew a drone to photograph the moment. Minutes later, Department of Homeland Security agents and Los Angeles police officers were on the scene, according to Bz Zhang, a project manager who was helping run the event. Soon the FBI arrived. They confiscated the drone and fined the person operating it.

The Neighborhood Land Trust was hosting a celebration for teenagers who had created a native plant garden on a patch of land that used to be an oil drilling site when authorities arrived.

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Wendy Salvador

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" We were unknowingly in violation of federal airspace, and we were told that we were a threat to national security," said Zhang, who witnessed the encounter.

The drone had violated temporary flight restrictions implemented for the World Cup. The Federal Aviation Authority has banned unauthorized drones within "3-nautical-mile radius and up to 3,000 feet above ground level" around stadiums on match days and also prohibited them around certain fan events, like the one at the Coliseum.

Since the tournament started in L.A., federal authorities have seized dozens of drones near SoFi Stadium and the Coliseum, according to the FBI. In total, more than 600 drones have been confiscated across the country.

The crackdown is part of an effort across all 11 U.S. host cities to identify and remove unauthorized drones from the skies around World Cup venues and fan events. Ahead of the tournament, FEMA awarded host cities $250 million specifically to combat drone usage.

"We knew we needed to act quickly to keep the World Cup safe from the rising threat of unmanned aircraft systems and that’s exactly what we did,” said Karen Evans, FEMA's acting cdministrator, in a statement announcing those funds.

But Zhang said that the incident at the garden represented the unintended consequences of hosting mega-events like the World Cup for ordinary community members.

" It's one thing to be aware of construction. … It's another to be expected as residents to know, to the 10th of a mile, that I'm in a particular zone and that, to the hour, I need to be in compliance," Zhang said.

Laura Eimiller, FBI spokesperson, disagreed. She said drone operators are responsible for knowing the rules and that every person in L.A. who had a drone confiscated during the World Cup also received a fine.

"There's been a zero-tolerance approach," Eimiller said.

Hiding out among the luxury beachfront condos in the Newport Beach neighborhood of Corona Del Mar is an outpost where scientists have been conducting important marine research for nearly a century.

And you can go check the place out for yourself.

A ‘magical’ marine station 

With its Spanish style architecture that includes a central tower and red-tiled roof, Caltech’s Kerckhoff Marine Laboratory looks like it’s been teleported in from another time and place.

Originally built as a boat and club house, it was purchased by Caltech in 1929 for use as a beachfront science outpost.

Victoria Orphan, James Irvine Professor of Environmental Science at Caltech and director of the Kerckhoff Marine Lab, said the place is one of the oldest running marine labs on the West Coast.

“There’s something just really magical about marine stations. They’re rustic, so it’s not like you’re going into a fully polished clean room. But that’s part of the charm and you really feel the history,” Orphan said.

One of her favorite spots? The tower. That’s where Orphan said some famous papers were written.

“Sometimes when I have writer’s block, I’ll go and sit in the tower and try to channel the scientists of old,” she told LAist.

That would include the work of Wheeler North, one of Orphan’s heroes. From 1962 to 2002, he conducted pioneering research on the ecology of kelp forests. Orphan said North’s work was instrumental for learning how an imbalance in the sea urchin population can decimate kelp forests.

These days that important research continues, with scientists at the lab looking at how microbes can capture carbon dioxide, mitigating global warming. They even have a 4-foot, bright yellow autonomous vehicle that scans the seafloor so scientists can learn more about seagrasses, which are important for oxygen creation and carbon capture, serve as fish nurseries and help protect the coastline from storm surge.

Kerckhoff Marine Laboratory in Corona del Mar

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“In areas where you have seagrass, you get less sediment erosion [and] a little more protection of the property on land, which people who live on the coast care about,” Orphan explained.

Engineers from Jet Propulsion Laboratory are also interested in using autonomous vehicles in cooperation with the lab to see how they can help study the deep ocean right outside the harbor.

You can visit the lab to learn about all of the science going on there, with free open houses on Tuesdays and monthly ‘Science and Sunsets’ events that include dinner and cocktails at the historic outpost.

A pop-up book that’s seeking to break the world record for size has unfolded at the Central Library in downtown Los Angeles.

The art piece is 31 feet wide, more than 11 feet tall, and weighs in at 1,800 pounds.

Luceros y Penumbras, which roughly translates to “starlight and shadows,” is rooted in L.A. artist Daniel González’s experience visiting the library and his family in Mexico as a child.

“It's a knowledge tree that's been shaped by all these different things that I've learned at the library, about myself, about the city I grew up in, [and] about the town where my family's from,” González said.

The nonprofit Library Foundation of Los Angeles collaborated with the library to commission the piece as part of the Central Library’s centennial celebration.

The project is inspired, in part, by the library’s Toy Movable collection, an archive of more than 2,000 pop-up books.

“Normal pop-up books … they seem so simple, but something amazing pops out when you open the page,” said Todd Lerew, the foundation’s director of special projects. “That sort of childlike wonder that you feel that's persistent, even as an adult, is something that was really important to capture and dial up to 11 with this project.”

The origin of 'Luceros'

The foundation asked González in June 2025 to create a book that told the story of his personal relationship with the library. As González pondered questions including  ”What did the library do for me as a young person?" and "Why was I so attracted to it?" he thought about how knowledge was passed down in his family through the generations.

His grandmother told him stories about the stars above her farm near Teúl, Zacatecas, in Mexico. She said those that emerged at dawn — luceros — were among the most special because they signaled the start of a new day.

“ I looked at those stars … and the histories that my grandparents were sharing with me as these guiding lights,” González said. “Just like the library is a guiding light for many people.”

Daniel González's maternal grandmother, Isabel Gómez, told him stories about the creatures that lived near her farm, including owls, that could teach healing.

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González grew up blocks away from the Benjamin Franklin Library in Boyle Heights.

“ I spent summers there because it was literally the coolest place to be,” González said. “It just gave me the opportunity to explore anything that I had an interest in.”

Daniel González, as a child, after an unsuccessful attempt to make a kite after a trip to the library.  "My dad's like, 'I'm gonna take a picture of you so you can see what you look like when you get grumpy,'" he said.

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Later, he’d visit the Central Library during a middle school field trip and return on the bus to wander the stacks and ask the staff questions.

“ I'm really lucky that I met the people that nurtured that curiosity,” González said.

From sketches to ‘paper engineering’

First, González sketched the images, carved them into linoleum, printed them with ink and digitized them to add color and other details.

A few of Daniel González's tools. In the future, he plans to sell prints related to "Luceros y Penumbras."

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Matthew Reinhart, children’s book author, illustrator and “paper engineer,” was tasked with translating the images into three dimensions.

“ My job is really making mistakes,” Reinhart said. “Making mistakes, figuring out where they are and solving them and — of course — making them look good.”

The construction and the fabrication of the book took the work of more than 30 people over a series of months. At least a dozen people using giant poles capped with cushions turn the pages.

Luceros y Penumbras is four pages that open to create two scenes — one of the Central Library building and another of a sprawling tree with an I Spy-like collection of creatures and images throughout. The featured pages will change throughout the exhibition, which is open until mid-November.

There are at least a dozen different symbols throughout “Luceros y Penumbras."

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Mariana Dale

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The sea turtle at the base of the tree is a reference both to the creatures that live in the San Gabriel River and to the original inhabitants of the L.A. basin. The Gabrielino-Tongva Tribe tells a story that connects the region’s earthquakes to the turtles.

“When we think of sea turtles, we think of these faraway places where they live, like tropical places,” González said. “But they exist here and they've had to adapt to a changing climate, a changing environment, and find places to call home, just as people do.”

Other images include:

• A star resting in an outstretched hand in honor of Octavia E. Butler, the science fiction writer who also spent time in the library. 
•  Quetzalcoatl, the feathered serpent Aztec deity and a frequent motif in East L.A.’s murals. 
• An owl, a symbol of knowledge associated with the Greek goddess Athena and the Roman goddess Minerva. 

González said the goal is for viewers to create their own narrative about what they see.

“ I just hope that people carry with them a sense of curiosity to further explore the things that I present, but also maybe something within them,” González said.

Visit the pop-up book

Central Library Centennial Festival

On display