Washington, D.C
Aggressive Algae Bloom Clogged Water System, Prompting Boil Water Advisory in D.C. and Parts of Virginia – Inside Climate News
A severe algae bloom clogged equipment at one of the treatment facilities providing drinking water in the Washington region, forcing officials to declare a boil-water advisory on the night of July 3—as thousands of visitors arrived to celebrate Independence Day.
The advisory was lifted the morning of July 4. But the incident was an ominous sign of how warming water temperatures caused by climate change can disrupt essential civic services.
The algal blooms caused a drop in water supply at the Dalecarlia Water Treatment Plant on the Maryland-D.C. border. All water treatment operations were switched to the McMillan Treatment Plant in Northwest D.C. to ensure adequate supply of water, the District of Columbia Water and Sewer Authority (DC Water) said in its July 3 advisory.
The disruption in water supplies affected the entire District of Columbia and parts of Arlington, Virginia, including the Pentagon, Arlington National Cemetery and Reagan National Airport. Among the blooms’ impact: increased turbidity, a measure of cloudiness in water.
The U.S. Army Corp of Engineers (USACE) operates the treatment plants located in D.C. and supplied by the Washington Aqueduct, which collects, treats and pumps drinking water for nearly 1 million customers in Washington, Arlington County and other areas in northern Virginia.
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The algae intruded at a time when demand for water was particularly high due to the influx of visitors and possible firefighting activities related to the annual fireworks display on the National Mall.
“DC Water issued a precautionary boil water advisory to protect public health and safety due to a sharp reduction in the volume of water being supplied by the Army Corps of Engineers’ Washington Aqueduct and due to the Aqueduct expressing concerns that they might be unable to comply with strict U.S. EPA water quality standards while simultaneously attempting to increase water supply volumes to levels adequate to meet DC Water’s customer demands,” said Sherri Lewis, senior manager of communications at DC Water, in emailed remarks. “The combined output of treated water from both of the Aqueduct’s plants was insufficient to meet DC Water’s water consumption demands.”
Lewis said the week of the July 4th holiday has historically been one of DC Water’s highest water demand days of the year.
Affected customers scrambled to stock up on bottled water supplies after the advisory was announced, quickly emptying out aisles in supermarkets and local stores.
“We had floating algae mats along the top of our sedimentation basin at our Dalecarlia Treatment Plant, which then washed into the filter building, clogging filters in the process,” said Cynthia Mitchell, a public affairs specialist with the U.S. Army Corps of Engineers.
The sedimentation portion of the water filtration process removes suspended particulates in water. In emailed comments to Inside Climate News, Mitchell said the situation at Dalecarlia led to a decrease in supply, while the McMillan Treatment Plant continued to operate under normal conditions.
“Our recent algae bloom was not a cyanobacterial harmful algae bloom—we had green algae which does not pose a risk to human health,” Mitchell added.
The U.S. Environmental Protection Agency EPA, warns that “blooms of red tides, blue-green algae, or cyanobacteria can result in severe impacts on water quality, human health, aquatic ecosystems, and the economy.”
In the case of the July 3 event, it was the sheer amount of algae that caused problems. The region’s record-high temperatures are driving growth, and climate change is expected to worsen the situation, Mitchell said.
“Washington Aqueduct staff that have served for decades, including General Manager Rudy Chow with 40 years of experience in the water utility industry, agree the severity of algae blooms this summer is unprecedented,” Mitchell said.
DC Water’s Lewis said several other utilities that use the Potomac River as one of their water supply sources, such as Fairfax Water in Virginia and the Washington Suburban Sanitary Commission in Maryland, encountered and successfully treated these same algal blooms.
Nitrogen, key fuel for algae, flows into water bodies from sewage overflows and runoff. Bill Dennison, a professor and vice president at the University of Maryland Center for Environmental Science, said the Potomac River has historically had high levels of pollution from sewage but now agriculture and stormwater runoff is the biggest source of pollution in the Chesapeake Bay watershed.
“Generally, both cyanobacteria and green algae form in the Potomac River,” Dennison said. “Fortunately, green algae don’t tend to be as toxic as cyanobacteria. But they’re not a pleasant addition to the environment and can clog the waterways … and produce bad taste in drinking water.”
Climate change contributes a one-two punch. More rain instead of snow in the winter leads to extra pollution runoff earlier in the season, Dennison said. And warming temperatures allow algae to bloom earlier in the summer than before.
DC Water officials said they are reviewing their actions and communications to the public about the July 3 event to determine what can be improved.
Lewis said that unlike the majority of other public water utilities, DC Water does not have a second source of water and is fully dependent on the Aqueduct to supply its needs. “It is also extremely unusual for a water utility serving a large metropolitan city not to also have direct responsibility for water supply and water treatment. DC Water will be reviewing the Aqueduct’s actions to determine if any changes are necessary to ensure proper notification steps are taken in a timely manner,” she said.
While greater D.C. avoided major calamity with this algae bloom, other cities haven’t been as lucky. In 2014, the water supply of Toledo, Ohio, had to be shut down because of a harmful algal bloom in Lake Erie, and the toxin associated with that algae could not be destroyed by boiling. Half a million people could not use water supplies for days. Agricultural runoff was later declared the cause of the ordeal.
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Aman Azhar is a Washington, D.C.-based journalist who covers environmental justice for Inside Climate News with focus on Baltimore-Maryland area. He has previously worked as a broadcast journalist and multimedia producer for the BBC World Service, VOA News and other international news organizations, reporting from London, Islamabad, the United Arab Emirates and New York. He holds a graduate degree in Anthropology of Media from University of London’s School of Oriental and African Studies (SOAS) and an MA in Political Science from the University of the Punjab, and is the recipient of the Chevening scholarship from the UK government and an academic scholarship for graduate studies from the Australian government.
WASHINGTON (7News) — An ice cream truck caught fire in Southeast D.C. on Thursday, the D.C. Fire and EMS Department said.
The commercial vehicle was reported fully engulfed when crews arrived in the 1700 block of Tobias Drive SE.
SEE ALSO | Man, woman injured in Southeast DC double shooting
Firefighters quickly put out the flames and prevented the fire from spreading to nearby buildings.
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No injuries were reported.
WASHINGTON (7News) — The Catholic archbishop of Washington, D.C., Cardinal Robert McElroy, on Wednesday removed a well-known priest as an exorcist of the archdiocese after he made public comments suggesting that UFO sightings were the work of demons.
McElroy said the archdiocese also was cutting ties with the St. Michael Center for Spiritual Renewal, a Washington-based nonprofit headed by the priest, Monsignor Stephen Rossetti.
The archbishop said Rossetti’s statements “linking UFOs to demonic presence and the Center’s recent use of social media gravely undermine the Church’s very precise teaching on the devil, demons and exorcism.”
“There’s a danger here,” Rossetti said in a May 29 video posted on his Facebook page addressing UFO sightings and the existence of aliens. “As an exorcist I wanted to raise that danger. And that is that demons like to hide. … They don’t want us to know what they’re doing because they’re more effective when we don’t realize it.”
“They can kind of get into your head, you know, and manipulate things in the world to influence us to do evil.”
“It’s my personal belief that probably many if not most of these UFO sightings are in fact demons,” Rossetti added.
Rossetti also said that people can be good Catholics and believe there’s life on other planets, though he does not personally believe life exists elsewhere.
In a statement posted on the St. Michael Center website, Rossetti said he was saddened by the action of the archdiocese.
“I ask forgiveness for any ways that I have not been faithful to the teachings of the Church’s Magisterium, particularly in the cited video on ‘aliens and the demonic,’” he said. “I believe it is of the utmost importance to be obedient to the Church and I will continue to endeavor to subject all that I do and the Center to be thus obedient.”
Rossetti, who has over 148,000 followers on Instagram, is a prominent psychologist as well as an exorcist. His center has specialized in offering spiritual healing for priests troubled by various difficulties.
In 2023, he told The Associated Press there was increasing and renewed appetite for information about demonic possession and exorcism.
Washington, D.C
Nurses at Washington D.C.’s largest hospital call on leadership to reverse planned cuts to maternal health
RNs at MedStar Washington Hospital Center say closure of postpartum unit will disproportionately harm marginalized and underserved communities
Union nurses at MedStar Washington Hospital Center (MWHC) in Washington, D.C. are demanding that management stop the planned closure of an entire postpartum unit, announced National Nurses Organizing Committee/National Nurses United (NNOC/NNU). The hospital notified the union on May 26, 2026 of its intention to eliminate 11 maternal health beds and displace eight nurses by July 26, 2026, leaving MWHC with one postpartum unit.
In a follow-up town hall with staff nurses, Chief Nursing Officer Ariam Yitbarek confirmed the closure. Other leaders have additionally informed staff that the hospital will strictly limit scheduled C-sections and inductions for patients from numerous D.C. maternal health organizations. The list of organizations includes many that primarily serve low-income patients, immigrants, and patients of color, all communities with significantly higher risks of maternal mortality. Additionally, staff were informed that Kaiser Permanente, which notably insures a large number of DC city employees and even many of MWHC’s own workers, will see a strict limit on scheduling inductions and C-sections for their patients as well.
“Closing postpartum unit 5F will gravely impact those most affected by health disparities,” said Stephanie Sims-Coates, RN in the neonatal intensive care unit. “Our low-income families and families of color will be most affected by this closure. Families trust the medical staff at MWHC and plan to come to us for their care. In a city where Black women make up 90 percent of pregnancy-related deaths despite being only half the population, the hospital’s decision to close this unit is a significant mistake.”
Community leaders and healthcare workers are joining the call for MedStar to put patients before profits and keep the unit open. This past weekend, nurses met with D.C. mayoral candidate and Ward 4 councilwoman Janeese Lewis George about the planned closure and the impact it would have on DC’s most vulnerable residents.
“Maternal mortality is a crisis for Washington, DC, and our healthcare system needs to address the crisis immediately, rather than exacerbate the challenges that birthing parents face,” said Councilwoman Janeese Lewis George. “Now is the time to invest in health care, rather than make cuts. I want to work with the hospital to identify solutions that work for patients and the provider.”
“In my time at Washington Hospital Center, I’ve seen the hospital tout its Safe Moms, Safe Babies program and host a community baby shower specifically designed to call attention to the maternal mortality crisis,” said Marcqueata “Tiya” Butler, RN in the Mother/Baby unit. “Their current plan to shut down 11 postpartum beds betrays the hospital’s stated commitments. They are aware of persistent inequities in access to care. We are calling on the hospital to consider the impacts on the community, safeguard the mothers and infants of DC and commit to addressing the maternal mortality rate.”
In 2024, MedStar Health, a registered non-profit, reported $9 billion in operating revenue.
NNOC/NNU represents more than 2,200 registered nurses at Washington Hospital Center.
National Nurses United is the largest and fastest-growing union and professional association of registered nurses in the United States with more than 225,000 members nationwide. NNU affiliates include California Nurses Association/National Nurses Organizing Committee, DC Nurses Association, Michigan Nurses Association, Minnesota Nurses Association, and New York State Nurses Association.
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