A faint plume of smoke on a clear early August morning was the first harbinger of the Frijoles Fire, which ignited in the rugged Sangre de Cristo Mountains of northern New Mexico. The blaze, sparked by a lightning strike near the historic village of Cundiyó, rapidly consumed the drought-stricken canyons surrounding the Río Frijoles, an event that cast a long shadow over the region’s centuries-old agricultural traditions. This vital 13-mile stream, along with the Río en Media, originates in the Sangres and flows into Santa Cruz Lake. From this reservoir, their waters are channeled into the Santa Cruz River, which is further augmented by the Río Quemado.

These waterways are the lifeblood of numerous small family farms in several historic communities. Their sustenance flows not directly from the main rivers but through an intricate network of approximately 30 hand-dug channels, known as acequias. These communal arteries, collectively owned by around 3,000 parciantes, or water rights holders, are a testament to enduring agricultural practices. Established hundreds of years ago, the acequias predate the construction of the Santa Cruz Dam by many generations and are recognized as distinct political subdivisions within New Mexico. Their management and maintenance are overseen by dedicated commissions and individual mayordomos, who are responsible for the equitable distribution and upkeep of these critical irrigation systems.

The Frijoles Fire, however, posed a direct threat to this delicate ecological and agricultural balance. With more than half of the Río Frijoles watershed lying directly in the fire’s path, the health of the entire ecosystem and the future of the region’s irrigation infrastructure were in jeopardy. Ron Gallegos, chair of the Santa Cruz Irrigation District, which manages water for downstream irrigators, described the anxious wait for news, "Once it started, I was just waiting for a call, a text, a message from somebody to see if they could pump water from the lake." His premonition proved correct; within days, U.S. Forest Service aircraft began drawing water from the lake to combat the flames and deploying slurry to slow the fire’s advance.

Gallegos’s district entered into a contract with the Forest Service, receiving one cent per gallon of water used for firefighting efforts. While the payment amounted to roughly $8,500 for approximately 850,000 gallons – a relatively small volume in the grand scheme of water resources – the effort to safeguard the watershed, which supports the agricultural endeavors of some 3,000 people, made the compensation feel secondary.

As of early October, nearly two months after the Frijoles Fire ignited, containment reached approximately 90%. Initial assessments indicated that the majority of the fire burned at a low intensity, suggesting a potentially minimized impact on the post-fire landscape. Nevertheless, concerns linger regarding the potential for increased sediment runoff from the burned areas, which could lead to turbidity in Santa Cruz Lake. Local communities are understandably worried about the cumulative effects of this sediment and the fire retardants used on water quality, upon which their livelihoods depend.

Even before the Frijoles Fire erupted, the region had been grappling with increasingly precarious irrigation conditions. In recent years, the area has experienced rapid climatic shifts, oscillating between prolonged droughts and intense torrential rains. This year, a meager snowpack and persistently high temperatures severely curtailed natural runoff. "It could be the worst on record," stated Steve Finch, a hydrogeologist and geochemist based in Albuquerque. Data from a nearby U.S. Geological Survey gauge corroborated this grim assessment, registering a mere 4 cubic feet per second throughout the summer, a stark contrast to the typical 20 to 30 cubic feet per second.

These critically low water levels and warmer temperatures contributed to an earlier-than-usual algae bloom, transforming the lake into a murky green expanse emitting a strong, unpleasant odor. Joel Esquibel, who operates and maintains the Santa Cruz Dam, a role inherited from his father, expressed his growing unease as the fire raged. He monitors the lake’s water levels multiple times a week, climbing a concrete buttress to survey the dwindling reservoir. "The only time it was lower was when it was dredged in the late 1980s," he recalled. Fortunately, by the end of September, a moisture-rich plume from Hurricane Polo brought a welcome 15-foot rise in the lake’s water level.

However, the threat of excessive water also looms large. In 2025, a historic flood devastated acequia infrastructure, bringing irrigation to a standstill. The subsequent rebuilding of headgates and the removal of debris and silt consumed months and cost hundreds of thousands of dollars, highlighting the vulnerability of these ancient systems. The heavy rains in September 2025, while beneficial for water levels, also carried debris and silt from the Frijoles Fire into the lake. Finch expressed concern that this influx will reduce the reservoir’s storage capacity. He estimates that over the past century, Santa Cruz Lake has accumulated approximately 1,000 acre-feet of silt, representing about a quarter of its original capacity. While the precise amount of silt deposited by the post-fire rains remains unknown, Finch anticipates that the reservoir will eventually require dredging to restore its storage capabilities.

The use of fire retardants in combating the Frijoles Fire also sparked renewed scrutiny. On August 4th, the day the fire began, New Mexico Representative Teresa Leger Fernández, D, formally requested that the Government Accountability Office (GAO), a federal watchdog agency, investigate the prevalence and potential environmental effects of toxic metals in fire retardants employed by the Forest Service and the Department of the Interior. Her letter, co-signed by eight other members of Congress, acknowledged the "essential, lifesaving support" provided by aerial firefighting but also noted that "recent reports have raised questions about the safety of fire retardants commonly used by aerial firefighters."

A spokesperson for the Forest Service, Claudia Brookshire, stated in an email that all fire retardants used by the agency fall under the Environmental Protection Agency’s "practically non-toxic" classification for mammals and aquatic species. She further emphasized that the Forest Service prohibits retardant drops within waterways and designated avoidance areas for cultural resources or sensitive species. While fire retardants primarily consist of two forms of phosphate, commonly found in fertilizers, investigations in California have detected the presence of arsenic, cadmium, chromium, and lead in samples collected after major wildfires.

These findings echo concerns raised following the Hermit’s Peak/Calf Canyon Fire, which ravaged over 340,000 acres of forest land in northern New Mexico three years prior. Independent analyses conducted after that blaze revealed the presence of heavy metals in private well water, with a 2026 report attributing these contaminants to both naturally occurring ores and burnt structures, alongside fire suppressants. In the Frijoles Fire, approximately 453,000 gallons of retardant were deployed, a significant amount but less than a quarter of the 1.6 million gallons used on the much larger Hermit’s Peak/Calf Canyon Fire. The Frijoles Fire, at 16,000 acres, represents less than 5% of the scale of the Hermit’s Peak blaze.

When questioned about the presence of heavy metals in the retardant used on the Frijoles Fire at a public meeting in early September in Truchas, Lawrence Lujan, a deputy district ranger for the Santa Fe National Forest, directed inquiries to the manufacturer. Zak Bollenbacher, president of the Americas Retardants business at Perimeter Solutions, the retardant’s manufacturer, clarified that no heavy metals are intentionally added to PHOS-CHEK formulations. He explained that any trace amounts detected are naturally occurring within the raw materials. Bollenbacher added that the phosphate used in the Frijoles Fire retardant undergoes processing to reduce heavy metal levels below fertilizer grade.

PHOS-CHEK, a brand of firefighting foam developed by Monsanto in the late 1960s, is sprayed from aircraft to curb wildfire propagation. While most of its components are publicly available through material safety data sheets, a small percentage remains proprietary as trade secrets. This opacity prompted a team of researchers from the University of Southern California to investigate the presence of heavy metals in retardants, analyzing data from fires between 2009 and 2021. Their 2024 findings identified concerning levels of heavy metals in one Phos-Chek product, Phos-Chek LC95-W, which was once considered the world’s most widely used retardant. The study indicated levels orders of magnitude higher than the EPA’s drinking water standards. Although the Forest Service phased out this specific product in 2024, it confirmed its use on the Hermit’s Peak/Calf Canyon fire, along with two other Phos-Chek variants. Another retardant used on Hermit’s Peak and, according to Bollenbacher, also employed to help contain the Frijoles Fire, had previously been linked to high heavy metal concentrations in recent major California fires.

Lead researcher Daniel McCurry noted that the USC team was unable to analyze a second type of retardant used on the Frijoles Fire, Phos-Chek 259-Fx, due to a lack of access to all manufacturer samples. On the ground, the acequia parciantes are anxiously awaiting the full impact of these events. The entire lake has taken on a dark, ash-like hue, and water quality concerns persist. With no further water releases scheduled for the remainder of the year, any debris and silt that has entered the lake will have the winter months to settle. This settling process is expected to prevent the immediate distribution of these contaminants into the acequias, at least for the current year.