Grand Canyon’s Dragon Bravo megafire shows the growing wildfire threat to water systems

Tourists watch smoke from the Dragon Bravo wildfire float through the Grand Canyon. Scott Olson/Getty Images

As wildfire crews battled the Dragon Bravo Fire on the Grand Canyon's North Rim in July 2025, the air turned toxic.

A chlorine gas leak had erupted from the park's water treatment facility as the building burned, forcing firefighters to pull back. The water treatment facility is part of a system that draws water from a fragile spring. It's the only water source and system for the park facilities on both rims, including visitor lodging and park service housing.

The fire also damaged some of the area's water pipes and equipment, leaving fire crews to rely on a fleet of large water trucks to haul in water and raising concerns about contamination risks to the water system itself.

By mid-August, Dragon Bravo was a "megafire," having burned over 140,000 acres, and was one of the largest fires in Arizona history. It had destroyed more than 70 structures, including the iconic Grand Canyon Lodge, and sent smoke across the region.

A National Park Service worker assesses a split in an exposed section of the Grand Canyon's fragile water lines in 2014. The water pipeline, installed in the mid-1960s, feeds water from Roaring Springs, located approximately 3,500 feet below the North Rim. Grand Canyon National Park via Flickr

Wildfires like this are increasingly affecting water supplies across the U.S. and creating a compounding crisis that experts in water, utilities and emergency management are only beginning to wrestle with.

A pattern across the West

Before 2017, when the Tubbs Fire burned through neighborhoods on the edge of Santa Rosa, California, most research on the nexus of wildfire and water had focused on issues such as drought and how climate change effects ecosystems.

The Tubbs Fire destroyed thousands of buildings and also melted plastic water pipes. After the fire, a resident's complaint about the taste and odor of tap water led to the discovery that the fire's damage had introduced contaminants including benzene, a carcinogen, into parts of the public water system.

It quickly became obvious that the damage discovered at the Tubbs Fire was not unique.

Similar damage and pollutants were discovered in another California water system after the 2018 Camp Fire destroyed much of Paradise, a town of over 25,000 people.

The list of incidents goes on.

In southern Oregon, the 2020 Almeda Fire damaged water pipes in buildings, leaving water to flow freely. That contributed to low system pressure just when people fighting the fire needed the water.

Water meters and pipes are vulnerable to damage during a fire. Andrew Whelton/Purdue University, CC BY

In Colorado, the 2021 Marshall Fire burned through urban water lines, damaging six public drinking-water systems along with more than 1,000 structures in the Boulder suburbs. All six systems lost power, which in some cases led to a loss of water pressure, hampering firefighting.

As firefighters worked on the Marshall Fire, water system operators raced to keep water flowing and contaminants from being transported into the water systems. But tests still detected chemical contamination, including benzene, in parts of the systems a few weeks later.

Then, in January 2025, the Los Angeles fires supercharged concerns about water and wildfire. As firefighters raced to put out multiple fires, hydrants ran dry in some parts of the region, while others at higher elevations depressurized. Ultimately, over 16,000 structures were damaged, leading to insured losses estimated to be as high as US$45 billion.

Water supplies are crucial to fighting fires. In cities, fire crews like this one battling the Palisades Fire in Los Angeles in January 2025 can often rely on hydrants. But water systems can lose pressure and potentially the power to run their pumps during fires. AP Photo/Etienne Laurent

Water infrastructure is not merely collateral damage during wildfires – it is now a central concern.

It also raises the question: What can residents, first responders and decision-makers reasonably expect from water systems that weren't designed with today's disasters in mind?

Addressing the growing fire and water challenge

While no two water systems or fires are the same, nearly every water system component, ranging from storage tanks to pipelines to treatment plants, is susceptible to damage.

The Grand Canyon's Roaring Springs system exemplifies the complexity and fragility of older systems. It supplies water to both rims of the park through a decades-old network of gravity-fed pipes and tunnels and includes the water treatment facility where firefighters were forced to retreat because of the chlorine leak.

Many water systems have vulnerable points within or near flammable wildlands, such as exposed pump houses that are crucial for pulling water from lower elevations to where it is needed.

A stand pipe at Zorthian Ranch in Altadena, Calif., failed during the January 2025 fire there, making it even more difficult for Alan Zorthian to fight the flames sweeping across his property. He used a pump drawing water from a swimming pool to try to fight the flames, but numerous structures were destroyed. Myung J. Chun/Los Angeles Times via Getty Images

In addition, hazardous materials such as chlorine or ammonia may be stored on-site and require special considerations in high fire risk areas. Staff capacity is often limited; some small utilities depend on a single operator, and budgets may be too constrained to modernize aging infrastructure or implement fire mitigation measures.

As climate change intensifies wildfire seasons, these vulnerabilities can become disaster risks that require making water infrastructure a more integral part of fighting and preparing for wildfires.

Ways to help everyone prepare

As a researcher with Arizona State University's Julie Ann Wrigley Global Futures Laboratory, I have been working with colleagues and fire and water systems experts on strategies to help communities and fire and water managers prepare.

Here are a few important lessons:

Prioritizing fire-resistant construction, better shielding of chemicals and, in some cases, decentralizing water systems can help protect critical facilities, particularly in high-risk zones. Having backup power supplies, mobile treatment systems and alternate water sources are essential to provide more security in the face of a wildfire.Emergency command protocols and interagency coordination are most effective when they include water utilities as essential partners in all phases of emergency response, from planning to response to recovery. Fire crews and water operators can also benefit from joint training in emergency response, especially when system failure could hinder firefighting itself.Longer term, protecting upstream watersheds from severe fire by thinning forests and using controlled burns, along with erosion control measures, can help maintain water quality and reduce water pollution in the aftermath of fires.Smaller and more isolated systems, particularly in tribal or low-income communities, often need assistance to plan or implement new measures. These systems may require technical assistance, and regional support hubs could support communities with additional resources, including personnel and equipment, so they can respond quickly when crises strike.

Looking ahead

The Dragon Bravo Fire isn't just a wildfire story, it's also a water story, and it signals a larger, emerging challenge across the West. As fire seasons expand in size and complexity, the overlap between fire and water will only grow.

The Grand Canyon fire offers a stark illustration of how wildfire can escalate into a multifaceted infrastructure crisis: Fire can damage water infrastructure, which in turn limits firefighting capabilities and stresses water supplies.

The question is not whether this will happen again. It's how prepared communities will be when it does.

Faith Kearns does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.