A group of anti-nuclear activists used data from Los Alamos National Laboratory to map places where plutonium contamination has been found in areas near the lab.

Nuclear Watch New Mexico says that the data indicates plutonium contamination has migrated through the subsurface and into important water sources. The group called for comprehensive cleanup at LANL.

The data is publicly available and there are more than 100,000 samples for plutonium dating from 1970 to 2023. However, Sophia Stroud, a digital content manager for Nuclear Watch New Mexico, explained that they did not want to include samples on their map that could be linked to fallout from nuclear weapons testing rather than activities at the lab.

They narrowed down the samples to remove plutonium samples that could have come from nuclear weapon testing. That left about 58,100 samples that were taken from below ground between 1992 and 2023.

Of those samples, about 70 percent of them were below detectable levels of plutonium.

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For years, the public had no clear picture of Los Alamos National Laboratory’s plutonium footprint. Had the ubiquitous plutonium at LANL infiltrated the soil? The water? Had it migrated outside the boundary of the laboratory itself?

A series of maps published by Nuclear Watch New Mexico are beginning to answer these questions and chart the troubling extent of plutonium on the hill. One map is included below, while an interactive version appears on Nuclear Watch New Mexico’s website. The raw data for both comes from Intellus New Mexico, a publicly accessible clearinghouse of some 16 million environmental monitoring records offered in recent decades by LANL, the New Mexico Environment Department and the Department of Energy.

Approximately 58,100 red dots populate each map at 12,730 locations, marking a constellation of points where plutonium — a radioactive element used in nuclear weapons — was found in the groundwater, surface water or soil. What’s alarming is just how far that contamination extends, from Bandelier National Monument to the east and the Santa Fe National Forest to the north, to San Ildefonso tribal lands in the west and the Rio Grande River and Santa Fe County, to the south.

The points, altogether, tell a story about the porous boundary between LANL and its surrounds. So pervasive is the lab’s footprint that plutonium can be found in both trace and notable amounts along hiking trails, near a nursing home, in parks, along major thoroughfares and in the Rio Grande.

Gauging whether or not the levels of plutonium are a health risk is challenging: Many physicians and advocates say no dose of radiation is safe. But when questions about risk arise, one of the few points of reference is the standard used at Rocky Flats in Colorado, where the maximum allowable amount of plutonium in remediated soil was 50 picocuries per gram. Many sites on the Nuclear Watch map have readings below this amount. Colorado’s construction standard, by contrast, is 0.9 picocuries per gram.

Trace amounts of plutonium from decades of weapons work at Los Alamos National Laboratory have contaminated the Rio Grande at least as far as Cochiti Lake and could be in the regional aquifer that serves a large population of New Mexicans, a nuclear watchdog says.