The area around Alamogordo, New Mexico still carries trace levels of radioactivity from the Trinity nuclear test, detonated on July 16, 1945, about 60 miles northwest of town at what is now the White Sands Missile Range. The radiation at the Trinity site itself has declined dramatically over nearly 80 years, but it hasn’t disappeared entirely. And for the communities that lived downwind of the blast, the health consequences are still unfolding.
What’s Left at the Trinity Site
The bomb that exploded over the Jornada del Muerto desert created a half-mile-wide crater and fused the sandy soil into a glassy, mildly radioactive mineral called Trinitite. That green-tinted glass still contains detectable amounts of several radioactive materials: plutonium (multiple forms), cesium, cobalt, barium, europium, and americium. These aren’t just theoretical traces. Lab analysis using advanced spectroscopy can still identify and measure them decades later.
The U.S. Army bulldozed much of the Trinitite layer in 1952, partly because collectors kept sneaking onto the site to take souvenirs. Removing Trinitite from the site is now illegal, though pieces still circulate among collectors. The remaining material sits beneath a thin layer of soil and poses minimal risk to visitors who spend a short time there. The site is open to the public only two days per year, and a typical visit lasts a few hours at most. Visitors during those open houses receive a radiation dose roughly comparable to what you’d get from a chest X-ray or a short commercial flight.
Radiation Levels Today vs. 1945
Most of the radioactive materials produced by the Trinity blast had short half-lives, meaning they decayed to negligible levels within weeks or months. The isotopes that remain, like cesium-137 (with a 30-year half-life) and various plutonium isotopes (with half-lives ranging from thousands to tens of thousands of years), are present at low concentrations. Standing at ground zero today exposes you to radiation levels roughly 10 times the natural background for the region, but still well within what radiation scientists consider a safe range for brief exposure.
That said, “low” and “safe for a short visit” are not the same as “gone.” The plutonium and americium embedded in Trinitite will remain detectable for thousands of years. The site is radioactive in a measurable, scientific sense. It’s just not radioactive at levels that pose a meaningful health risk to someone passing through.
The Downwinder Health Crisis
The story is very different for the people who lived in the surrounding communities in 1945. When the Trinity bomb detonated, no one evacuated the small towns, ranches, and Indigenous communities scattered across the Tularosa Basin. Fallout drifted across the region, settling on water sources, crops, livestock, and rooftops. Families drank contaminated water, ate contaminated food, and breathed contaminated dust for weeks and months afterward, with no warning and no knowledge of what had happened.
The health toll has been severe. Cancer rates in Lincoln, Otero, Sierra, and Socorro counties, the four counties surrounding the test site, run three to eight times higher than the national average. The Tularosa Basin Downwinders Consortium has collected over 800 health surveys from residents of Otero and Socorro counties, documenting patterns of cancer and thyroid disease that align closely with known effects of radiation exposure. Many families report multiple generations affected.
The critical distinction is between the site itself and the people who absorbed fallout into their bodies. Radioactive particles that are harmless under glass at a museum become dangerous when inhaled or ingested. Internal exposure, where radioactive material lodges in bones, lungs, or thyroid tissue and irradiates cells for years, is far more damaging than walking across contaminated ground.
Compensation for New Mexico Residents
For decades, New Mexico’s downwind communities were excluded from the federal Radiation Exposure Compensation Act (RECA), which originally covered only residents of Nevada, Utah, and Arizona who lived near the Nevada Test Site. That changed in July 2025, when RECA was reauthorized under the One Big Beautiful Bill Act and expanded to include New Mexico.
Under the updated law, individuals who lived in New Mexico for at least one year between September 24, 1944, and November 6, 1962, and who were later diagnosed with a qualifying cancer or illness, can file for a one-time payment of $100,000. If the affected person has died, surviving family members can apply to split that amount. All claims must be filed by December 31, 2027.
What This Means Practically
If you’re planning to visit the Trinity site during one of its biannual open houses, the radiation exposure is minimal and comparable to everyday sources like air travel or medical imaging. The site is not dangerous for a brief visit.
If you or your family lived in the Tularosa Basin or surrounding counties during or after the 1945 test, the picture is more complicated. The land itself no longer poses the acute contamination risk it did in 1945, but the biological damage from that original exposure has cascaded through families for generations. The expanded RECA program represents the first federal acknowledgment that New Mexico communities bore real health consequences from Trinity, though many advocates argue the $100,000 payment falls far short of covering the medical costs families have accumulated over eight decades.