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Aggressive Algae Bloom Clogged Water System, Prompting Boil Water Advisory in D.C. and Parts of Virginia – Inside Climate News

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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.  

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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. 

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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.” 

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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.” 

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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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READ: Report accuses DC Police Chief Pamela Smith of ‘fear, intimidation, threats’

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READ: Report accuses DC Police Chief Pamela Smith of ‘fear, intimidation, threats’


Metropolitan Police Department (MPD) Chief Pamela Smith is facing yet another scathing report accusing her of manipulating crime data in the city.

The 22-page document from the House Committee on Oversight and Government Reform comes less than a week after a separate draft report from the Department of Justice (DOJ) and days after Chief Smith turned in her resignation.

The main difference between the Congressional report and the DOJ report is that this new one, released on December 14, contains transcribed interviews directly with commanders from all seven MPD patrol districts.

RELATED | DC Police settles with former employee over claims that crime numbers were manipulated

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The testimony reveals how Chief Smith chastised and, in some cases, publicly humiliated staff in crime briefings.

“The Committee’s investigation heard consistent testimony about frustration and exhaustion among MPD commanders and the manifestation of a culture of fear, intimidation, threats, and retaliation by Chief Smith. Often, these manifestations were triggered whenever the Chief was presented with what she considers ‘bad news,’ particularly when that news pertained to any rise in public crime statistics. Chief Smith, according to testimonies, regularly took action against her subordinates who failed to aid in the preservation of her public image,” the report states on page two.

RELATED | Trump announces probe into DC police for inflating crime stats amid safety claims

The committee launched the investigation in August when whistleblowers came forward with concerns about data manipulation.

One line of questioning in the report states:

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Question: Over the last few years, has there been any internal pressure to simply bring down crime statistics?

Answer: Yes, I mean extreme… there’s always been pressure to keep crime down, but the focus on statistics… has come in with this current administration or regime, and you know, that has manifested publicly.

7News reached out to Mayor Bowser’s Office for a comment in response to the report. A spokesperson provided the following statement:

The men and women of the Metropolitan Police Department run towards danger every day to reduce homicides, carjackings, armed robberies, sexual assaults, and more. The precipitous decline in crime in our city is attributable to their hard work and dedication and Chief Smith’s leadership.

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I thank Chief Smith for her commitment to the safety of D.C. residents and for holding the Metropolitan Police Department to an exacting standard, and I expect no less from our next Chief of Police.



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DC police chief accused of manipulating crime data in new House Oversight Committee report – WTOP News

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DC police chief accused of manipulating crime data in new House Oversight Committee report – WTOP News


D.C. Police Chief Pamela Smith has been accused of manipulating crime data to “maintain the appearance of low crime” in a new report released Sunday by the House Committee on Oversight and Government Reform.

D.C. Police Chief Pamela Smith has been accused of manipulating crime data to “maintain the appearance of low crime” in a new report released Sunday by the House Committee on Oversight and Government Reform.

The interim staff report came from transcribed interviews with the commanders of all seven D.C. patrol districts, as well as one former commander currently placed on suspended leave, according to a news release.

The report alleges Smith “punished and removed officers for reporting accurate crime numbers and fostered a toxic culture.”

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D.C. police Chief Pamela Smith recently announced she is stepping down at the end of the month after two years leading the department.

Mayor Muriel Bowser’s office told WTOP they “are reviewing the report.”

Read the full report here.

This is a developing story and will be updated.  

Get breaking news and daily headlines delivered to your email inbox by signing up here.

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© 2025 WTOP. All Rights Reserved. This website is not intended for users located within the European Economic Area.



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How Maryland is Tackling Traffic Delays and Enhancing Travel to Washington D.C. Through Key Infrastructure Upgrades, Here is All You Need to Know – Travel And Tour World

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How Maryland is Tackling Traffic Delays and Enhancing Travel to Washington D.C. Through Key Infrastructure Upgrades, Here is All You Need to Know – Travel And Tour World



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December 14, 2025

Traffic delays in D.C. have long been a challenge for both residents and visitors. In Maryland, addressing these issues has become a top priority, with major projects aimed at easing the notorious Beltway congestion. Among the most crucial initiatives are the reconstruction of the American Legion Memorial Bridge and the Francis Scott Key Bridge. These key infrastructure upgrades are essential not only for reducing traffic delays but also for improving access to Washington D.C.’s famous attractions. With millions of tourists visiting the nation’s capital every year, these projects aim to enhance the flow of traffic, ensuring a smoother travel experience for all. By tackling congestion head-on, Maryland is making significant strides in boosting Washington D.C. tourism. The ongoing improvements promise to make visiting the capital more convenient and enjoyable, benefiting both locals and travelers alike.

Maryland’s Focus on Infrastructure Upgrades

One of the most pressing issues currently being tackled by Maryland officials is the ongoing traffic delays in D.C. caused by outdated and overcrowded bridges. The Francis Scott Key Bridge, in particular, has seen its estimated costs balloon as the need for reconstruction becomes more urgent. The Maryland Department of Transportation has faced increasing pressure to ensure the timely and efficient completion of this project, which is expected to be fully funded by taxpayers.

In September 2025, U.S. Transportation Secretary Sean P. Duffy raised concerns regarding the proposed budget and timeline for the FSK Bridge replacement. This project, aimed at addressing significant traffic bottlenecks, is crucial to improving the daily commute for both locals and visitors heading into Washington D.C. for business, leisure, or cultural experiences.

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Addressing Congestion on the American Legion Memorial Bridge

Another key project under discussion is the American Legion Memorial Bridge, which connects Maryland to Virginia along the I-495 Beltway. This bridge is notorious for heavy congestion, contributing significantly to the broader traffic delays in D.C. In 2025, Washington, D.C. was rated the worst city in the nation for traffic, with an average delay of more than six hours. As part of efforts to alleviate this problem, Secretary Duffy and Maryland Governor Wes Moore are exploring ways to accelerate the reconstruction of the American Legion Memorial Bridge.

A major focus of this initiative is the public’s input on how best to alleviate congestion in the I-495/I-270 corridor. The Federal Highway Administration (FHWA) has recently released a Request for Information (RFI) to gather feedback on potential solutions. The aim is to develop a multi-state plan to address the congestion that affects both Maryland and Virginia, directly benefiting travelers heading into Washington D.C. This effort is seen as vital for improving the overall travel experience in the region, particularly for tourists navigating the Beltway.

Improving Access for Washington D.C. Tourists

Tourism in Washington D.C. is a significant economic driver for the region. Each year, millions of tourists flock to the nation’s capital to visit iconic landmarks such as the White House, the U.S. Capitol, the Lincoln Memorial and the Smithsonian museums. However, these visitors often face traffic delays that hinder their ability to enjoy their trip. The ongoing congestion on the I-495 Beltway and critical bridges like the American Legion Memorial Bridge and the Francis Scott Key Bridge directly impact the ease with which tourists can access these sites.

Improving these key transportation routes will not only benefit local commuters but also enhance the tourism experience in Washington D.C. Faster and more efficient access to the city’s major attractions can encourage more visitors, boosting local tourism revenue and supporting the area’s hospitality sector. By addressing Beltway congestion and modernizing key infrastructure, Maryland is taking a proactive approach to ensuring that tourists spend less time stuck in traffic and more time exploring the capital’s many cultural and historical offerings.

The Role of the Capital Beltway Accord

Maryland’s commitment to improving transportation in the region is also evident in its collaboration with Virginia through the “Capital Beltway Accord.” In 2019, Maryland and Virginia announced a bipartisan agreement to build express lanes on the Beltway, designed to ease congestion. Virginia completed the 495 Express Lane Extension in November 2025, a move that aims to improve the flow of traffic between the two states.

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The express lanes offer an expedited route for drivers and are expected to have a direct impact on reducing congestion, particularly in areas where traffic delays have historically been the most severe. For tourists traveling to Washington D.C., these lanes represent a potential shortcut that could significantly shorten travel times to key attractions. The implementation of such infrastructure upgrades helps ensure that both residents and tourists benefit from improved access to the region.

Public Input and Community Involvement

Secretary Duffy has emphasized the importance of involving the public in the planning and development of these transportation projects. The release of the Request for Information (RFI) for the American Legion Memorial Bridge reconstruction is a clear indication of Maryland’s commitment to ensuring that local communities, commuters and tourists alike have a say in how congestion is addressed. Public input is vital for shaping the future of transportation in the region, particularly when it comes to making improvements that impact everyday lives and travel experiences.

A Brighter Future for Maryland’s Transportation Network

With ongoing efforts to tackle Beltway congestion, rebuild the Francis Scott Key Bridge and improve the American Legion Memorial Bridge, Maryland is positioning itself to enhance travel to Washington D.C. for years to come. The state’s focus on modernizing key infrastructure projects is crucial for easing traffic delays and improving the overall experience for both residents and tourists. As these projects progress, they promise to unlock smoother, more efficient travel, benefiting everyone who relies on these critical routes.

Conclusion: Enhancing Travel Through Strategic Infrastructure Investment

Maryland’s commitment to addressing traffic delays in Washington D.C. through key infrastructure upgrades is set to have a significant impact on both local commuters and tourists. The reconstruction of the American Legion Memorial Bridge and the Francis Scott Key Bridge will not only ease Beltway congestion but also improve access to the capital’s major attractions. By ensuring that these vital projects are completed on time and within budget, Maryland is making strides in improving travel for everyone who relies on these roads. With the ongoing public input process and collaboration with neighboring Virginia, the future of travel in the Washington D.C. metro area looks brighter than ever.



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