A collection of top water news from around California and the West compiled each weekday. Send any comments or article submissions to Foundation Writer Matt Jenkins.
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The headlines below are the original headlines used in the publication cited at the time they are posted here and do not reflect the stance of the Water Education Foundation, an impartial nonprofit that remains neutral.
The chances of a wet winter — with soaking storms, coastal
flooding and other problems — are growing in the Bay Area and
across California as El Niño conditions in the Pacific Ocean
continue to strengthen. On Thursday, scientists at NOAA, the
National Oceanic and Atmospheric Administration, said there is
a greater than 90% chance of a strong El Niño being
present in October, November and December, and a 75%
probability that it will rank as the strongest in history since
modern records began in 1950, up from 69% last month.
… In addition, supercomputer models from many of the
world’s top meteorological organizations are showing
increasing chances that all of California, not just
Southern California — which normally has higher odds
of a wet winter than Northern California during El Niño years —
could see heavy rainfall, particularly after
December.
Water officials from the United States and Mexico have signed a
new agreement for sharing the Colorado River. Mexico will take
less water from the river under the new deal, but gain a degree
of certainty about its ability to access a shrinking river with
a shaky future. Expert onlookers are heralding the deal
as a success and a rare example of cross-border
collaboration. They said the cuts are necessary in
response to a severely depleted Colorado River. … A
previous agreement from 2017 will expire at the end of this
year. The new one will be in effect from the beginning of 2027
to the end of 2028. For that term, Mexico will take larger cuts
than it has in the past. The new deal reduces Mexico’s
share of the Colorado River by 250,000 acre-feet, about 17% of
its original allocation from the Colorado River.
Last month tied July 2023 as the hottest month recorded
worldwide, with temperatures 1.65C above preindustrial levels,
the European Union’s Copernicus Climate Change Service said
Thursday. August 2026 was the first month since
November 2025 to exceed 1.5C of global warming.
Western Europe just completed its hottest summer on record,
eclipsing a mark set in 2003. In another sign of the planet
heating up, sea-surface temperatures across most of the
world’s oceans are expected on Thursday to mark their 100th
straight day at record levels for the time of year,
according to an analysis by Climate Central, an independent
nonprofit in Princeton, N.J. Daily sea-surface
temperatures outside the polar regions have been at record
levels since June 2, according to the analysis, which uses data
from the U.S. National Oceanic and Atmospheric Administration.
Gov. Gavin Newsom’s signature water deal is starting to unravel
just months before he leaves office. The governor’s plan sought
to direct billions of state, federal and water district dollars
toward restoring the sensitive Bay-Delta ecosystem
while providing farms and cities with more flexible access to
the water. Now, two of its most important partners,
the federal government and Westlands Water District, the
largest irrigation district in the Central Valley, are
threatening to walk away. This development puts Newsom in a
bind as he tries to cement a water legacy built around
making California’s water supply more reliable — an
agenda that has occasionally put him on the same side as the
Trump administration.
The San Francisco Bay shoreline’s first-of-its-kind horizontal
“living levee” project is now open to the public. More than
2,000 plants hailing from 30 species are planted on a
500-foot-long slope of the Harbor Marsh shores in the Palo Alto
Baylands. Traditional levees are constructed from rocks or
concrete, but this project is piled high with
vegetation to create a healthier ecosystem for the marsh,
acting as a natural buffer between the land and water.
Its overall goal: to provide the shore with protection from
rising sea levels, which can cause flooding. … The
plants are irrigated by treated wastewater
from the Regional Water Quality Control Plant, which is owned
by Palo Alto.
After a wildfire, water systems face two challenges: physical
damage to the system and public trust. Fires can damage pipes,
treatment facilities, and storage, while contaminants may enter
the water system and take time to detect and remove. At the
same time, residents may be asked not to use their tap while
systems are assessed and repaired. But even after service is
restored, people may remain unsure whether their water is safe.
Water systems need both the capacity to restore service quickly
— and clear, trusted communications to tell residents when tap
water is safe to use again. Those findings are at the center of
a new workshop synthesis report from the UCLA Luskin Center for
Innovation and UC Agriculture and Natural Resources.
A report released Sept. 9 by California Ocean Science Trust
(OST), in partnership with UC San Diego’s Scripps Institution
of Oceanography, analyzes the state of the science behind flood
risk modeling and mitigation as part of an effort to
incentivize risk reduction. The report assesses current flood
modeling practices and offers eight recommendations to improve
how mitigation infrastructure is reflected in the catastrophe
models that are used to set insurance prices. Titled
Strengthening Incentives for Flood Risk Reduction in
Catastrophe Modeling and Insurance: Recommendations for
California Coastal Counties, it calls for improved practices
ranging from better representation of phenomena such as
atmospheric rivers in the models, greater access to federal
flood insurance data, and making it clear in insurance premiums
what savings could be achieved through risk reduction.
At the time of its initial construction, California’s State
Water Project was one of the largest water infrastructure
projects in U.S. history. Construction began in 1961, and the
first water deliveries reached Southern California in 1972.
Spanning over 700 miles from the Feather River watershed in
California’s upper northeast to Lake Perris in the south, it
remains a marvel of modern engineering and a testament to the
state’s 20th century technological dominance. Its construction
was witnessed and documented by both the public and the state
government, and California’s Department of Water Resources
(DWR) hosts a massive public photo archive that continues to
grow. … In addition to their technical and
aesthetic mastery, the images express a sense of utopian
optimism. The photos in this essay, all taken from 1962 to
1968, reflect a post-World War II confidence that grand
infrastructure could tame and re-engineer where “nature” fell
short.
Utah officials are increasing monitoring along the Colorado
River after an automated water sampler detected zebra mussel
DNA near Potash — a warning sign that officials say they are
taking seriously, but not yet considering an
infestation. The detection comes as Utah continues its
aggressive effort to keep invasive mussels from spreading
beyond Lake Powell. Bruce Johnson, with the Utah Department of
Natural Resources’ Aquatic Invasive Species program, says the
positive sample is an indicator that the state needs to take a
closer look. … Johnson says the state has designated the
Colorado River as infested as far south as the Utah border,
with detections around Grand Junction and Loma. Lake Powell,
meanwhile, is already infested with quagga mussels.
NOAA Fisheries has awarded $103 million in funding for 16
habitat restoration projects across the country. These projects
will recover and sustain our nation’s fisheries by ensuring
fish have access to high quality habitat. … Fisheries
rely on healthy habitats like wetlands, rivers, and coral reefs
as important areas to grow, eat, and reproduce. These projects
will restore healthy habitat for fish across the country. …
California: California Trout: Reconnecting floodplain habitat
for coho salmon in the Klamath River. ($5.4 million) California
Department of Water Resources: Restoring fish passage to
support habitat for salmon and sturgeon. ($8 million)
Colorado ranchers who own some of the state’s most scenic
landscapes are joining new research efforts to better
understand emerging water quality issues in the Yampa and
Gunnison basins, among others. Pressured by rising stream
temperatures and shrinking flows due to climate change, rivers
and lakes across the state are showing signs of distress,
including algae blooms, some of which are toxic. At the same
time, the Colorado Department of Public Health and Environment
and Colorado State University are analyzing water quality and
testing how voluntary best management practices, rather than
strict regulations, can protect these hallmark water bodies.
Officials from the United States and Mexico announced Wednesday
a Colorado River water-sharing dealfor next two years as the
basin continues to be overstressed by prolonged drought. The
short-term deal, formally known as Minute 334,
calls for Mexico to cut 250,000 acre-feet, or
more than 100,000 Olympic swimming pools’ worth of water, in
both 2027 and 2028. It also establishes an environmental work
group and a pilot program to manage the salinity of
Colorado River water as it reaches Mexico.
… Under the new international plan, Mexico’s share of
the Colorado River could decrease or increase based on
forecasts for upstream reservoir conditions at Lake Mead, on
the Arizona-Nevada border.
Temperatures in the Pacific Ocean are still rising as this
year’s El Niño strengthens. A monthly outlook
published Thursday by the National Oceanic and Atmospheric
Administration’s Climate Prediction Center gives a 75%
chance that El Niño will become “historic” from October to
December. … L’Heureux explained that the timing
of this precipitation will likely trail behind El Niño’s peak
strength in the ocean. “The outlooks show that the strongest
probabilities for increased precipitation in California
are during December-March,” [Climate Prediction Center
physical scientist Michelle] L’Heureux wrote. … And
oceanographers are also expecting El Niño to temporarily raise
sea levels and bump up winter wave energy, threatening
the coastline with erosion and flooding, especially during
storms.
California’s beloved condors and sea otters have
rebounded from the brink of extinction thanks to the Endangered
Species Act. Now the state is going to court to keep the
50-year-old law intact, filing two lawsuits Wednesday to block
what Democratic leaders describe as the Trump administration’s
rollback of its protections. Attorney General Rob Bonta filed
the suits with a coalition of 21 attorneys general, adding to
dozens California has already filed to combat the Trump
administration’s deregulatory agenda. … Trump’s changes,
finalized in July, rescind a definition of harm that
made it illegal to damage the places that endangered species
call home — effectively opening up habitat where they
shelter, breed and eat to mining, logging and other
development.
Aurora Water is in talks to purchase land and water from two of
the most historic farms in the Lower Arkansas Valley, adding to
farm communities’ worries about “buy and dry” pressure
from cities amid historic drought and a dwindling agricultural
economy. But Aurora Water says it has learned lessons
from past controversies and is structuring the latest buy-up to
preserve southeastern Colorado farm life, not destroy it.
… Recent southeastern Colorado water purchases by Aurora
Water and other utilities have given the agencies rights to dry
up farmland in, for example, three out of 10 years. Many local
farmers and water conservancy officials say that casts
too much uncertainty on a farm owner’s economic plans.
They are also not convinced that farmland can recover after
being completely dried up for entire seasons.
Rising global temperatures caused by the burning of fossil
fuels are transforming the world’s forests, wetlands and tundra
to the point they are releasing emissions that could further
worsen global heating by as much as 30%, a new study has found.
As the world heats up, permafrost in the high latitudes is
thawing, fiercer wildfires are burning in drying forests and
wetlands and lakes are warming. All of these changes are
themselves causing the release of planet-heating methane and
carbon dioxide locked in trees and soils, therefore worsening
the climate crisis, the paper states. … “This hidden
multiplier is missing from the models guiding climate policy,
so those models are likely underestimating how much warming is
coming – and overestimating how much carbon we can still afford
to emit,” said Sam Abernethy, a scientist at Spark Climate
Solutions who led the research,
published in Environmental Research Letters.
… The National Oceanic and Atmospheric Administration (NOAA)
announced new agency priorities last week that they say are a
commitment to “cutting bureaucracy, modernizing our science,
and putting our fishing communities first.” But experts say the
agency’s actions will erode fish stocks, threaten endangered
species and surrender marine habitats to destructive trawlers.
… On the table: opening marine national monuments to
commercial fishing operations, scaling back critical habitat
designations to focus more on the downstream economics of
conservation and weakening decades of peer-reviewed science.
The Orange County Water District (OCWD) and the U.S. Army Corps
of Engineers (USACE) captured 18.1 billion gallons of
stormwater at Prado Dam between July 2025 and June 2026, the
highest total since the 1940s, according to OCWD. …
Water captured at Prado Dam flows downstream to OCWD’s recharge
facilities in Anaheim and Orange, replenishing the Orange
County Groundwater Basin, which supplies around 85 per cent of
the drinking water for 2.5 million people across north and
central Orange County. During fiscal year 2025-26, Santa Ana
River flows, including captured stormwater, accounted for
roughly 60 per cent of the district’s groundwater recharge.
An Amazon data center under construction in Gilroy is
frustrating a local transparency group and residents who
are voicing concerns about the city’s lack of openness in
allowing the project to move forward. Americans for
Transparency, a grassroots initiative led by Gilroy resident
Georgine Scott-Codiga, filed a formal demand of violations with
Gilroy asking for an admission that the land where the Amazon
data center is being developed has allegedly violated the
California Subdivision Map Act. … Scott-Codiga wants four
issues addressed by the city attorney and Gilroy City Council:
stop accepting Amazon’s water connection applications until the
subdivision issue is resolved; formally investigate whether the
Amazon parcel was illegally created; refer the matter to Santa
Clara County for enforcement; and notify Amazon in writing no
approvals will be issued until the alleged parcel defect is
corrected.
As the Newsom administration nears the end of its term, the
Department of Water Resources (DWR) continues to seek key
approvals for the Delta Conveyance Project (DCP), which would
divert up to 6,000 cubic feet per second from the
Sacramento River in southern Sacramento County and convey it
via a 45-mile long, 40-foot diameter tunnel to the south Delta
for export. The Delta Stewardship Council (Council) has
scheduled a hearing on October 15, 2026, on the three
appeals of DWR’s Revised Certification of Consistency with the
Delta Plan on Remanded Items (Revised Certification) for the
DCP. The Revised Certification responds to deficiencies
identified in the Council’s April Decision D20257 on DWR’s
October 2025 certification for the DCP.
