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On the calendar today …
- EVENT: Emerging climate science symposium beginning at 9am. The Delta Independent Science Board, which provides scientific oversight of programs that support adaptive management in the Sacramento-San Joaquin Delta, is hosting a two-day symposium. Through presentations, panel discussions, and a breakout group activity, the symposium will explore the current climate projections for the Delta, related uncertainties, and how the current state of climate science is being integrated into decision-making in the Delta. The symposium will help identify information gaps that should be incorporated into existing decision support models and assess how current management approaches align with the latest research in the field. Click here for the agenda. Attendance is free. Register to attend virtually.
- MEETING: State Water Resources Control Board beginning at 9am. Agenda items include consideration of the 2026 Nonpoint Source Grant Program Guidelines, revision of core water quality regulatory fee schedules, and amending water rights fee schedules. Click here for the full agenda.
- WEBINAR: Critical Heads, Critical Decisions: Using Quantitative Methods to Model Subsidence from 12:30 to 1:30pm. Presented by DWR’s Basin Characterization Program with Ben Brezing (DWR) and John Ellis (INTERA Inc.). Land subsidence caused by groundwater extraction has long been a significant challenge in California, with impacts including infrastructure damage, permanent loss of groundwater storage, and many millions of dollars in associated costs. In early July, DWR released the draft Subsidence Best Management Practice (BMP) that describes activities, practices, and procedures to comply with the intent of the Sustainable Groundwater Management Act (SGMA) and avoid or minimize subsidence. Included in the Technical Assistance section of the BMP is a discussion of the importance of historical subsidence data compilations, subsidence modeling methods, as well as 1D subsidence modeling examples through the Central Valley. This presentation provides an overview of DWR’s Draft Subsidence BMP, explores historical subsidence across the Central Valley, examines the concepts of critical head, and the role of numerical modeling as an important tool for decision-makers to manage land subsidence. Click here to register.
In California water news today …
Antioch’s $160 million desalination plant begins operation in bid to boost city water supply
“Antioch has finally turned on the taps of its long-awaited brackish water desalination plant, which is expected to help the city safeguard its water supply for decades to come. The $160 million facility, hailed by city leaders as a milestone in California’s water sustainability efforts, will meet up to 40% of Antioch’s water needs. Residents and businesses use up to 11 million gallons of water daily in the winter and 23 million in the summer. With the plant in service, the city can treat and convert into drinking water about 6 million gallons a day of brackish water pumped from the Sacramento-San Joaquin River Delta. The city has already been pumping as much water as possible from the river; however, because of an increase in saltwater levels over the years, it has been unable to do so during the summer and fall. To fill the gap, Antioch purchases more expensive water from the Contra Costa Water District to fulfill the needs of some of its 110,000 residents. … ” Read more from the San Jose Mercury News.
New desalination facility is a major milestone for drought-smart infrastructure solutions in the Delta
“Following several years of planning and investment, the City of Antioch has reached a climate-resilient milestone: a new brackish water desalination facility near its existing water treatment plant. The facility, supported by $10 million in Proposition 1 desalination grant funding from the Department of Water Resources (DWR) and a $60 million low-interest loan from the California Water Boards’ Drinking Water State Revolving Fund, will produce up to 6 million gallons per day of treated drinking water —an important boost to regional supply reliability amid rising salinity in the San Joaquin River. … ” Read more from DWR.
Year in Review: State Water Board provides $2 billion to advance California’s water infrastructure
“Strengthening California’s infrastructure to increase water supplies, protect the environment and preserve economic progress, the State Water Resources Control Board provided $2 billion during the past fiscal year (July 1, 2024 to June 30, 2025) to water systems in about 390 communities for projects that capture and recycle more water, clean up and recharge groundwater, expand access to safe drinking water and sanitation and improve stormwater management. When complete, these projects will benefit over 18 million Californians, or 46% of the state’s population. They also will add 5,000 acre-feet to the state’s water supplies and substantially advance Gov. Gavin Newsom’s Water Supply Strategy and build more, faster agenda to deliver infrastructure upgrades across the state. … ” Read more from the State Water Resources Control Board.
California’s Central Valley waterways could look a lot different in the future
“California’s water system is considered to be one of the most complex in the world. Thousands of miles of canals snake through Central California’s agricultural fields, transporting water from the state’s intricate network of dams and reservoirs to feed the thirsty almonds, strawberries and grapes (among other crops) that cover sprawling fields. Most Californians only glance at this system from a passing highway, remarking at its many miles of efficient uniformity. But soon, these waterways may start to look a little different. Near Hickman, California, just outside Modesto, a 110-foot-wide grid of solar panels now tops a section of canal, arching over the gently flowing water. Solar projects have long been a crucial piece of the state’s movement to clean energy, and these panels are part of a new project that’s hoping to do far more than just generate electricity. Dubbed Project Nexus, the $20 million state-funded initiative hopes to better understand whether these installations can be an even more efficient approach to solar energy. … ” Read more from SF Gate.
SEE ALSO: California Completes Solar Canopy Over Irrigation Canal, from Clean Technica
Working with nature to protect California’s agricultural regions: How nature-based solutions can build resilience
“California’s agriculture regions are at a crossroads. There is not enough water to maintain the state’s current agricultural water uses, while extreme heat, droughts, floods, air pollution, and economic instability affect farmers, communities, and the environment. Nature-based solutions offer a powerful approach to address these challenges by working with natural systems to increase climate resilience, create economic opportunities, improve water sustainability, and enhance public health. Examples of nature-based solutions include: Managed aquifer recharge, floodplain restoration, buffer zones around communities, constructed wetlands, and ecovoltaics.In this guide, case studies of these solutions in action are presented along with frameworks for implementation. … ” Read more from the Union of Concerned Scientists.
Podcast: Don Cameron: California ag leadership & challenges
“Don Cameron, president of the California State Board of Food and Agriculture, is not only a prominent voice in policy but also a hands-on farmer. Based in the Viola area, Cameron manages Terranova Ranch, a diverse farming operation producing more than 20 different commodities. Alongside his main operation, he also runs his own smaller farm growing almonds, walnuts, tomatoes, carrots, and corn. With about 65 full-time employees, his leadership reflects both administrative vision and boots-on-the-ground farming experience.” Listen to podcast or read excerpts from AgNet West.
Ninth Circuit upholds Clean Water Act exemption for irrigated agriculture
“In a decision with major implications for Western agriculture, the Ninth Circuit Court of Appeals has upheld the Clean Water Act exemption for irrigation return flows. The ruling in Pacific Coast Federation of Fishermen’s Associations v. Nickels affirms that discharges from irrigated agriculture are exempt from federal permitting requirements so long as they do not include additional point source discharges unrelated to crop production. The case centered on California’s Grassland Bypass Project, a drainage system that conveys water from nearly 100,000 acres of farmland. Environmental groups argued that pollutants entering the project from sources such as groundwater seepage, dust, or runoff should disqualify it from the exemption and trigger federal permitting under the National Pollutant Discharge Elimination System (NPDES). The Ninth Circuit disagreed. … ” Read more from the Western Farm Press.
Native American agriculture: roots of U.S. farming
“When Europeans first arrived in the New World, many believed they had discovered untouched wilderness—vast forests, endless plains, and fertile river valleys waiting to be cultivated. But this perception was far from the truth. Long before European settlement, Native American communities had already been shaping, managing, and cultivating the land through advanced agricultural practices.” Listen to podcast, read excerpts at Ag Net West.
La Niña winter is coming. Will that mean less rain in valley and snowpack in Sierra?
“National Oceanic and Atmospheric Administration forecasters are predicting a La Niña winter for California, increasing the potential for warmer and drier weather. The forecast is based on data collected from tropical Pacific Ocean surface temperatures, ocean currents, and atmospheric winds to calculate the El Niño-Southern Oscillation, which is used to predict whether the upcoming fall and winter will be El Niño, La Niña, or neutral. In La Niña events, “it’s one of those things where you can go one way or the other, but typically it tilts drier,” said Stephen McCoy, a meteorologist with the National Weather Service in Hanford. But a La Niña forecast is no guarantee that the winter will be a dry one, he said. In the winter of 2022-23, “we were actually in a strong La Niña event, which brought heavy, heavy rainfall to the area,” McCoy said. “Typically, we do see drier, warmer conditions with La Niña, but it’s not always the case.” … ” Read more from GV Wire.
Wild weather week possible in California as humid heat transitions to potential dry-to-wet thunderstorm outbreak thanks to tropical storm remnants
“The month of September started with a bang–or, rather, the near-constant rumble of thunder from thousands of lightning strikes amid an intense thunderstorm outbreak that affected a broad portions of interior central and much of northern California. (These were, BTW, the “potential surprises” I alluded to in the last blog post.) Many of these storms, especially initially, produced dry lightning (i.e., were associated with little or no rainfall). Many dozens of vegetation/wildfires were reported–and a handful of these went on to become large, threatening, and/or damaging–mainly in the Sierra Nevada foothills. The most destructive of these numerous lightning-ignited blazes, dubbed the “6-5 Fire,” overwhelmed the small but historic (and still actively populated) foothill community of Chinese Camp. Nearly the entire town was destroyed–around 100 structures in total–along with a dozen or so structures in other fires in surrounding communities. … ” Read more from Weather West.
California could be hit by unusually strong thunderstorms. Here’s when
“The odds of a potentially volatile weather event in California later this week are climbing. The remnants of Tropical Storm Mario in Baja California are being drawn north, setting the stage for scattered and potentially strong thunderstorms and dry lightning. The first strikes could arrive as early as Tuesday night in Southern California, raising the risk of enhanced fire weather conditions in the coastal foothills and inland valleys, before the storms spread into the Central Coast and Bay Area on Thursday and Friday. … ” Read more from the San Francisco Chronicle.
Atmospheric rivers and floods in California’s changing hydroclimate
“The paper titled Atmospheric Rivers and Floods in California’s Changing Hydroclimate was co-authored by SIO/CW3E’s Sasha Gershunov, Alexander Weyant, Michael Dettinger, Lu Su, Dan Cayan, Rosa Luna Niño, Kristen Guirguis, Tom Corringham and Marty Ralph, as well as seven other scientists and water management practitioners, including colleagues at DWR. It was recently published in a special issue of San Francisco Estuary and Watershed Science. It presents the state of the science on atmospheric rivers, extreme precipitation and flood risk in the changing climate, as impacts California’s water management systems. The article was commissioned by California’s Delta Stewardship Council that acts as the steward for sustainable and ecologically-responsible management of California’s water as part of the State of Bay-Delta Science (SBDS) synthesis report. … ” Read more from the Center for Western Weather & Water Extremes.
Klamath water bill awaits Newsom’s signature
“A bill aimed at preserving flows for fish on two Klamath tributaries passed through both chambers of the state legislature last week and awaits signature by Governor Gavin Newsom. Assembly Bill 263, authored by North Coast Assemblymember Chris Rogers (D-Santa Rosa), would maintain existing minimum flows for the Shasta and Scott rivers. The flow regulations were established as part of an emergency drought declaration four years ago. If enacted, the regulations would be kept until 2031 or whenever the State Water Board sets permanent rules that are currently in the works. “The Shasta and Scott rivers are currently under emergency regulations that took tribal voices and our state’s fisheries into consideration when they were developed,” said Rogers in a press release. The rivers are major tributaries to the Klamath River and host spawning grounds for fish, including threatened populations of salmonids. … ” Read more from the Eureka Times-Standard.
California lawmakers pass PFAS ban, bill heads to governor
“California is on the verge of becoming the next state to ban the use of per- and polyfluoroalkyl substances (PFAS), often called “forever chemicals” because they persist in the environment and the human body. Senate Bill 682, authored by Sen. Ben Allen (D-Santa Monica), has cleared the Legislature and now awaits Gov. Gavin Newsom’s signature. If signed into law, the bill would ban the sale and distribution of many consumer goods containing intentionally added PFAS beginning in 2028. Those products include cleaning supplies, dental floss, plastic food packaging and ski wax. A second phase, taking effect in 2030, would prohibit the sale of cookware with intentionally added PFAS. … ” Read more from Consumer Affairs.
Beavers return to tribal lands: a win for ecosystems
“The pictograph, an ochre-red outline with four paws and an unmistakable paddle of a tail, has been on the reservation “my whole life,” said Kenneth McDarment, a member of the Tule River Tribe. It’s just one of many paintings — of people, geometric designs and other wildlife — from 500 to 1,000 years ago adorning the walls of a site called Painted Rock in the southern California foothills of the Sierra Nevada mountains. But today, it stands out to McDarment, who formerly served on the Tule River Tribal Council. “Sometimes you need to just look at things more often,” he told Mongabay. About a decade ago, a succession of drought years parched the land, and leaders were searching for ways to shore up the reservation’s water. … So, the Tule River Tribe decided to find a way to bring them back. … ” Read more from Mongabay.
Climate, diseases driving death of several tree species in multiple California regions
“The trees that beautify California landscapes and provide food, shade and many other benefits are under attack by fungi that are increasingly causing trees to decline and die, according to a new study led by University of California Agriculture and Natural Resources scientists. “This paper is kind of a turning point in our understanding of major drivers responsible for changing our landscape as climate changes,” said lead author of the study Matteo Garbelotto, UC Cooperative Extension forest pathology specialist in UC Berkeley’s Department of Environmental Science, Policy and Management. “It is also a wonderful example of how collaboration between county-based UCCE advisors, landowners and campus-based researchers provides a powerful and unrivaled approach for early detection of new threats to plants at a large geographic scale,” Garbelotto added. … ” Read more from UCANR.
California’s environmental past confronts economic worries of the present
“California has long prided itself as an environmental trailblazer. It was the first state to set its own vehicle emission rules and the first to outlaw plastic shopping bags. In 2020, Gov. Gavin Newsom, a Democrat, went so far as to seek a ban on the sale of new gas-powered vehicles by 2035. Standing in front of several electric cars, he warned automakers against being on “the wrong side of history.” So it surprised environmentalists this year when Mr. Newsom and Democratic lawmakers began backtracking on signature green initiatives. They rebuked the state’s coastal preservation commission for regulatory overreach and rolled back the landmark California Environmental Quality Act, better known as CEQA, to address the state’s severe housing shortage. Then, to environmentalists, came the unthinkable: pushing legislation to keep oil refineries open and make oil drilling easier in California.“It’s a complete 180,” said Hollin Kretzmann, a lawyer at the Climate Law Institute, part of the nonprofit Center for Biological Diversity that focuses on protecting endangered species. … ” Continue reading at the New York Times.
And lastly … Every watershed deserves a rock opera
“The municipal sewer system in Hood River, Oregon, is in most ways like any other: essential to daily life, vulnerable to clogs, and rarely discussed in polite company. But it is surely the only sewer system in the world to play a starring role in a rock opera. The Watershed Rock Opera, which was performed live in Hood River last spring and is now available to watch online, was the brainchild of Sarah Fox, a local multimedia producer. As the director of a popular annual lecture series called Sense of Place, Fox invites community experts to address topics ranging from salmon migration to Japanese American history to the evolution of mountain biking. “I’m always looking for things that, whether we recognize it or not, whether we acknowledge it or not, connect us all,” she says. During a chance conversation with a local official, Fox realized that one of the most basic of those connections lay under the city streets. Every resident depends on the system of pipes that collect waste from homes, businesses, and schools and carry it to the wastewater treatment plant—and every resident plays a part in their maintenance by keeping grease and debris out of household drains. … ” Read more from the Sierra Club.
In regional water news and commentary today …
SACRAMENTO VALLEY
Butte County unveils Five-Mile flood project
“Something big was stirring in the flora at the Five-Mile Recreation Area as trees rustled and vibrations ran along the ground Monday. It was the work of heavy machinery like excavators and bulldozers, clearing out debris and biological materials with the goal of clearing more space for water in Big Chico Creek and the surrounding flood protection channels. Butte County announced its new plan to mitigate flood risk in northeast Chico on Monday, the Five-Mile Stream Action for Flood Emergency project, which is already underway at the park. According to a press release issued by the county, the goal is to remove vegetation and sediment to ultimately protect nearby homes, businesses and parkways before the winter months bring on the storms. … ” Read more from the Chico Enterprise.
SEE ALSO: Chico’s Five-Mile SAFE Project begins ahead of winter storm season to reduce flood risks, from KRCR
BAY AREA
Push to protect Bay Area coastlines from rising seas
“The topic of sea level rise and potential solutions took center stage in San Francisco Monday, much to the relief of many homeowners near the water. The San Francisco Bay Conservation and Development Commission (BCDC) is guiding coastal communities to develop their own rising sea level plans and said a recent $20 million boost from voter-approved bond measure Prop 4 is helping to make it happen. “It’s not going to be enough for everything all the time because rising sea levels are going to continue to happen,” BCDC Executive Director Larry Goldzband said. “So after the first plan is approved and it starts getting implemented, the communities and cities are going to have to look around and say, ‘OK, what do we do next?’” … ” Read more from NBC Bay Area.
CENTRAL COAST
Above state standard levels of Hexavalant Chromium found in Watsonville water supply
“The Pajaro Valley Unified School District (PVUSD) notified parents that Watsonville’s water supply showed Hexavalant Chromium levels above the state standard, but the city telling people that its water is still safe. The water samples showed levels between 12 to 20 parts per billion, which is above the state standard of 10 parts per billion (ppb). The city says that it is working to address these levels, but stress that this is not an emergency. … ” Read more from KION.
Never Again Moss Landing presses county on missing data, county points to Tuesday meeting
“The public is slated to hear “essential updates” from the Environmental Protection Agency about the Jan. 16 Moss Landing battery plant fire at Tuesday’s County Board of Supervisors meeting. Meanwhile, local watchdog group Never Again Moss Landing is asking the county and federal agencies for answers about air monitoring and chemical sampling related to the fire and its aftermath. In a letter dated Aug. 28, the group laid out six unresolved issues and requested that all related documents, both released and unreleased, be made public. The requests include missing air monitoring records from Jan. 18, hydrogen fluoride monitoring data from PG&E and results from the Feb. 18 flare-up. The group also questioned how background samples are being taken, citing concerns that samples may be collected from areas already exposed to the plume. … ” Read more from the Monterey Herald.
SOUTHERN CALIFORNIA
Eaton fire contaminated Altadena with lead. It’s lingering even after cleanup, final county report finds
“The Eaton fire left significant levels of lead in Altadena’s soil, according to a final report from the Los Angeles County Department of Public Health. The U.S. Army Corps of Engineers hauled away debris and soil from destroyed properties, but that did not completely remove the contamination, the report, released Friday, found. People whose homes are still standing, or are partially damaged, also face significant contamination. That is true both within and outside the burn scar. Most experts think the lead in the soil comes from incinerated lead paint that coated most homes built before it was banned in 1978. The findings are important because lead can permanently damage the brain, leading to developmental and behavioral issues in kids. … ” Read more from the LA Times.
Santa Monica’s waves have turned a bright pink. How can the dye job improve water quality?
“Over the next two weeks, surfers and beachgoers in Santa Monica may spot waves that have a pink, fluorescent hue — but officials say not to worry. The luminous, pink color spreading across the Santa Monica Bay is from a temporary, nontoxic dye that researchers are using to study how ocean circulation might contribute to the bay’s poor water quality. The project kicked off Monday morning, as researchers with UCLA and the Bay Foundation discharged the first of four batches of the pink dye near the Santa Monica Pier. “By following where the dye goes, we will better understand how the breakwater changes the environment around it, providing insight into Santa Monica beach’s poor water quality,” Isabella Arzeno-Soltero, an assistant professor of civil and environmental engineering at UCLA and a researcher on the project, said in a statement. … ” Read more from the LA Times.
SEE ALSO: Why was the ocean near Santa Monica Pier dyed pink? Scientists are studying currents, breakwater, from ABC 7
IMPERIAL/COACHELLA VALLEYS
Brawley to consider backing Salton Sea Authority in $5 million funding bid
“The City of Brawley will consider on Tuesday supporting a $5 million funding request by the Salton Sea Authority (SSA), advocating for an equitable distribution of funds from Proposition 4, a $10 billion climate resilience bond approved by California voters in November 2024. The decision, spearheaded by City Manager Rebecca Terrazas-Baxter and Assistant to the City Manager Emmet Fried, authorizes Mayor Gil Rebollar to sign a letter of support to the California Natural Resources Agency and legislative budget committees. … ” Read more from the Imperial Valley Press.
SAN DIEGO
Where oh where are my Tijuana River sewage updates
“In “Pirates of the Caribbean: The Curse of the Black Pearl,” Captain Jack Sparrow led his crew to buried treasure on Isla de Muerta – a place that could not be found, except by those who already know where it is. That’s how I feel about getting information on the Tijuana River sewage crisis from the Trump Administration’s new leadership. It’s out there – somewhere – but only those who know it exists can find it. Public updates alerting when sewage pumps or pipes burst or broke on either side of the border used to hit email inboxes within fairly short order under the previous administration. But under President Donald Trump’s newly appointed Commissioner Chad McIntosh, that’s no longer the case. Frank Fisher, a spokesperson for the International Boundary and Water Commission or IBWC – the cross-border water and sewage management agency – told me the agency switched to using X, formerly Twitter, for those updates. “It’s quicker and simpler,” Fisher said. … ” Read more from the Voice of San Diego.
Along the Colorado River …
‘No one comes out of this unscathed’: Experts warn that Colorado River use needs cutting immediately
“Consumption of Colorado River water is outpacing nature’s ability to replenish it, with the basin’s reservoirs on the verge of being depleted to the point of exhaustion without urgent federal action to cut use, according to a new analysis from leading experts of the river. The analysis, published Thursday, found that if the river’s water continues to be used at the same rate and the Southwest sees another winter as dry as the last one, Lakes Mead and Powell—the nation’s two largest reservoirs—would collectively hold 9 percent of the water they can store by the end of next summer. After enduring decades of overconsumption of the river’s water, the lakes would have just under 4 million acre feet of water in storage for emergencies and drier years when demand can’t be met. Every year, roughly 13 million acre feet is taken from the river for drinking water and human development across the region, with conservative forecasts estimating roughly 9.3 million acre feet of inflow next year. … ” Read more from Inside Climate News.
Study looks at ‘realistically available’ water in Lake Mead, Lake Powell a year from now
““Immediate and substantial reductions” in Colorado River water use could be needed much sooner than anyone predicted, according to a study published last week. The problem: People are using more water than the amount that has been coming down the river and it could reach a tipping point by the end of next summer, a University of Colorado study suggests. That means hard choices are ahead unless a very wet winter rescues 40 million water users along the river. A repeat of conditions this year — near-average snowpack (91% of normal), but streamflow levels projected at 52% of average — could put new pressure on the river. “If next year is a repeat of this year and uses of water remain the same, we estimate that consumptive use will exceed the natural flow in the Colorado River Basin by at least 3.6 million acre feet,” the CU study said. An acre foot is the amount of water needed to cover an acre of land in water a foot deep — 325,851 gallons. … ” Read more from Channel 8.
SEE ALSO: As the Colorado River Dies, A New Battle Over Water Rights, from the Flagler
Adult zebra mussels found in Colorado River, which is now designated “infested”
“Adult zebra mussels have been found in the Colorado River and a nearby lake in Grand Junction, Colorado Parks and Wildlife said Monday. The agency has detected the invasive species in its larval stage, called a veliger, in past sampling efforts in the river and nearby lakes. This is the first time an adult zebra mussel, a sign of a more established population, has been found in the Colorado River in Colorado. “While this is news we never wanted to hear, we knew this was a possibility since we began finding veligers in the river,” CPW Director Jeff Davis said in the news release. “I can’t reiterate this enough. It was because we have a group of individuals dedicated to protecting Colorado’s water resources that these detections were made.” The agency’s Aquatic Nuisance Species program staff confirmed zebra mussel veligers in West and East Lake near Clifton on Aug. 28. During a follow-up survey Sept. 2, staff discovered suspected adult zebra mussels in the lake, located west of 31 Road within the wildlife area section of James M. Robb-Colorado River State Park, the news release said. … ” Read more from the Colorado Sun.
In national water news today …
AI boosts National Weather Model flood prediction accuracy sixfold
“A new machine learning tool can reduce errors in national flood prediction programing, resulting in more accurate predictions of where floods will occur. In a new study, scientists found that when the AI was used in combination with the National Water Model, developed by the U.S. National Oceanic and Atmospheric Administration, the resulting hybrid model was four to six times more accurate. The AI was trained on NOAA data for the United States, but the system can be specialized for any country. The study was published in AGU Advances, which publishes high-impact, open-access research and commentary across the Earth and space sciences. This AI is a neural network, or a deep learning model, and is trained to find errors. The network was trained on historical observational and National Water Model simulated data on rainfall and flooding. Researchers created a hybrid program by combining the AI system with the National Water Model, which forecasts streamflow for the entire United States. … ” Read more from the American Geophysical Union.
