What the Potomac River Sewage Spill Reveals About U.S. Water Infrastructure

Critical Questions by Tanvi Nagpal

Published February 20, 2026

On January 19, a section of a large wastewater pipe (sewer) called the Potomac Interceptor collapsed about seven miles outside of Washington, D.C., resulting in what has become the largest wastewater spill in U.S. history. The pipe runs along a local highway and the C&O Canal National Historical Park by the Potomac River, and the spill has endangered river water quality in D.C. and parts of Maryland, Virginia, and West Virginia. DC Water, the utility responsible for water and wastewater for 700,000 D.C. residents and millions of visitors to the capital, and for treating wastewater for 1.8 million customers in the National Capital Region, reported that approximately 243 million gallons of wastewater had been released into the Potomac River as of February 6. On February 9, pumps clogged by non-flushable wipes led to another failure, releasing 600,000 additional gallons of sewage. In the days following, E. coli levels near the spill were nearly 12,000 times the U.S. Environmental Protection Agency (EPA) limit for recreation. Crews have been working night and day to install new pipes and pumps to divert the wastewater away from the site of the spill. Both the utility and local governments have assured the public of the safety of their drinking water, which is drawn from reservoirs upstream of the spill.

Q1: What are the immediate and long-term impacts of the Potomac River sewage spill?

A1: An accident of this size has disastrous environmental impacts. The Potomac is a critical resource for millions who use the river for fishing, recreation, and agriculture. Within days, DC Water assured customers that it was monitoring the river's water quality, and E. coli levels have begun to return to prior levels at testing sites downstream. However, local environmental nongovernmental organization Potomac Riverkeepers Network reported that tests it has conducted with the University of Maryland have shown dangerously high levels of E. coli and staphylococcus up to 10 miles from the spill, making the river dangerous for recreational use. he State of Maryland banned shellfish harvesting 50 miles downstream of the spill. DC Water and the District of Columbia's Health Department are posting updated test results on their websites showing that E.coli levels continue to fluctuate and remain elevated at some testing sites.

As the weather warms, and the millions of residents who live in the Potomac Basin return to boating, fishing, and swimming in the river, it will be important for authorities to communicate when the river is indeed safe once more. On February 18, D.C. Mayor Muriel Bowser declared the spill a "public emergency," requesting financial assistance from "the Federal Emergency Management Agency, any other federal, private, or nonprofit disaster relief and recovery organizations, and any other federal agencies to recoup expenditures incurred, or obtain funding needed to respond to and address the impacts of the incident." DC Water had previously budgeted $625 million to upgrade the interceptor, and the utility is in the midst of a $3.8 billion Clean Rivers Project which is projected to cut 93 percent of runoff into the Potomac by 2030.

Q2: What does the Potomac River spill reveal about broader challenges to U.S. water infrastructure?

A2: There are 152,000 publicly owned drinking water systems and nearly 18,000 publicly owned wastewater treatment facilities that provide year-round drinking water and wastewater treatment in the United States. Water and wastewater systems manage millions of miles of underground pipes that bring drinking water to and remove wastewater from most U.S. homes. Operating and managing this infrastructure is complicated and expensive. Many utilities struggling to meet operational costs defer maintaining, replacing, and upgrading outdated infrastructure. Breaks and leaks are common in drinking water and sewage pipes. The EPA estimates that there are between 23,000 and 75,000 sanitary sewer overflows in the United States every year. In addition, even though suppliers are prioritizing replacing old drinking water pipes, 20 percent of all water mains that carry treated drinking water to neighborhoods are past their useful life.

In 2024, the EPA projected that new and upgraded wastewater and stormwater infrastructure would cost $630.1 billion (in 2022 dollars) over the next 20 years to meet federal water quality standards. A year prior, the EPA reported that in order to provide safe drinking water, water systems need to invest $625 billion (in 2021 dollars) over two decades. In 2024 alone, the gap between the amount needed and the actual spending on water infrastructure was projected at $91 billion. When the Bipartisan Infrastructure Investment and Jobs Act (IIJA) was passed in 2021, it provided $50 billion for drinking and wastewater system upgrades, removal of lead lines, and remediation of chemicals such as polyfluoroalkyl substance. This investment, the largest-ever infusion of federal funds into U.S. infrastructure, has been key to beginning improvements, especially in the removal of lead lines across the country. However, the act expires in 2026, water infrastructure is still far from secure, and the needs are even more pressing. A 2025 annual assessment of the state of public infrastructure gave drinking water infrastructure a C-, stormwater a D, and wastewater a D+, reflecting the slow pace of progress. A recent assessment suggests that the financial requirements for modernizing water infrastructure have actually increased substantially to more than $3.4 trillion between now and 2040. The recent spill clearly reveals that more attention should be given to this issue.

Q3: What are some of the other threats that water utilities face in addition to aging infrastructure?

A3: Among the many threats facing U.S. water infrastructure, three are commonly noted: (1) extreme weather events, (2) the increased frequency and complexity of cyber threats, and (3) the workforce shortage. Directing more federal resources and attention to these is key to securing water infrastructure and the critical services it provides.

Extreme weather events: More frequent and intense weather events such as rainstorms and hurricanes are leading to severe inland and coastal flooding, including in places that had never experienced such phenomena. In 2024, there were 27 weather related disasters that together resulted in $182.73 billion in damages. For example, Hurricane Helene, which devastated parts of Georgia, North Carolina, and Tennessee, led to nearly $80 billion in damages. Hurricane Milton, which made landfall in Florida, led to over $34.3 billion in damages. Even without the high winds that accompany hurricanes, extremely heavy rainfall brings water in volumes that can overwhelm pipes and pumps, disrupting and damaging drinking water services and stormwater and wastewater treatment. One study estimates that the annual cost of extreme rain events will rise to $41 billion per year by 2050.

Too little water is as great a challenge as too much water. Extended drought such as the American Southwest megadrought, which has lasted 22 years, have stressed water providers over long periods of time. Droughts raise utility costs, as they require utilities to find water from alternate sources. When droughts are accompanied by heat waves, demand for water rises as supply falls, placing strains on providers and their customers. Hot and dry conditions also increase fire risks and place additional stress on water availability and quality. Local governments, households, businesses, and service providers are all struggling to adapt to these new climate realities.

Cyber threats: Providing safe water and treating wastewater are considered national critical functions according to the Cybersecurity and Infrastructure Security Agency, which states, "These functions are so vital to the U.S. that their disruption, corruption, or dysfunction would have a debilitating effect on national security, economic stability, and public health and safety."

Cyber threats are a quickly growing danger. Large utilities, which already have highly automated operations, are experimenting with AI tools for predictive and diagnostic analytics. As utilities digitize operations, use cloud-based services, and integrate AI tools, they need to invest more into cybersecurity upgrades to protect their monitoring and control systems, metering and billing, and physical operations. Ransomware and malware can disrupt the functioning of their pumps and meters or introduce glitches in their ability to oversee how their system is operating. In a worst-case scenario, a cyberattack could shut down drinking water or treatment systems, jeopardizing the health and safety of thousands of citizens and effectively shutting down all economic activity. While more utilities are turning to the use of automated and digital systems, they must simultaneously spend more on securing these systems, especially as the ability to understand and deploy AI tools has not kept pace with the technological advances.

Workforce shortage: All utilities-but especially those in small towns and rural areas-are contending with a workforce shortage. Of the 300,000 people who work in utilities, approximately one-third are operators, where shortages are most critical. More than half of all water and wastewater plant operators are above 45 years of age, and fewer than 5 percent are under 24. With rising demands for a more skilled and technologically savvy workforce, the sector needs an infusion of talent. Approximately 85 percent of utilities have three or fewer employees, and they already struggle to make timely repairs and procure parts, leaving no time or resources to invest in gaining advanced certifications, applying for grants or loans, or setting up systems to attract new talent. Dramatic differences between the scale of operations and resources available to large versus small utilities also make it difficult to create and share solutions that work for everyone.

Q4: What is the current funding landscape of water infrastructure in the United States?

A4: Local and state governments are responsible for almost 90 percent of the expenditure on water infrastructure. This spending comes from user charges on water bills, local taxes, and municipal bonds. Thus, it is essentially rate payers who are responsible for funding operations and financing new infrastructure. State Revolving Funds (SRFs), administered by EPA and capitalized by the federal government, provide low-interest loans to utilities based on set formulas and assessment of environmental benefit and economic need. Other federal agencies including Housing and Urban Development, the Department of Agriculture, the Environmental Protection Agency, and Health and Human Services also provide grants and loans for water infrastructure, particularly for small or rural systems. Additionally, the EPA-administered Water Infrastructure Finance and Innovation Act makes low interest, long-term loans to supplement other credit sources for infrastructure projects that cost more than $20 million (large utilities) or $5 million (small utilities). While all these sources of finance exist, it is often difficult or impossible for small utilities to meet all the technical requirements to access this money. Decades of foregone maintenance and a customer base that cannot afford to pay higher rates make it impossible for the smallest systems, who may serve 500 or fewer customers, to repay any loan. They must compete for state or federal grants to make much needed investments.

Q5: What policies are needed to make U.S. water infrastructure more resilient?

A5: The benefits of investing in water infrastructure far outweigh the costs. Every dollar spent in communities on improving resilience saves $13 in disaster-related costs. Reauthorizing spending at previous levels set by the IIJA and ensuring that SRFs are widely available to utilities of all sizes are of utmost importance. The recent compromise budget appropriated $2.76 billion in SRFs for drinking water and clean water. Another $1.6 billion would be distributed to 1,163 individual project earmarks requested by members of Congress. While this level of funding for 2026 was a welcome relief, sector actors have noted that earmarks are grants instead of loans, so they do not return money to SRFs, potentially reducing funds available for all the other projects prioritized and ranked by states with established criteria.

Utilities rely on customers for over 90 percent of their operational budgets, but many customers cannot afford to pay higher rates. According to a 2024 EPA report, 23 percent of community water systems serve populations where a majority of customers need assistance to pay their bills. When utilities cannot charge higher rates, they also cannot take on the financial risk of borrowing to invest in additional cybersecurity, workforce recruitment and training, or strengthened resilience to extreme weather events. One way to ensure that utilities can finance upgrades is by approving a permanent federal program that supports low-income households by helping to pay their water bills. This is critical to ensuring that everyone can be served, and community water systems can raise rates so that they can cover higher costs of supplying and treating water. In addition, smaller systems need grants and technical assistance to prepare congressionally mandated risk and resilience plans, so that they can respond to natural disasters, extreme weather events, cybersecurity breeches, sudden infrastructure failure, and contamination events.

Tanvi Nagpal is a senior associate (non-resident) for the Global Food and Water Security Program at the Center for Strategic and International Studies in Washington, D.C.

The author would like to thank Rose Parker, program manager with the CSIS Global Food and Water Security Program, and Defne Aslan, intern with the CSIS Global Food and Water Security Program, who contributed research to this piece.

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