UPDATED: THREE DEAD, FIRST RESPONDERS HOSPITALIZED IN MOUNTAINAIR HAZMAT INCIDENT — TEST RESULTS STILL PENDING

By Alamogordo Town News Staff | May 21, 2026 — Updated

MOUNTAINAIR, N.M. — A deadly hazmat incident at a rural Torrance County home has left three people dead, 18 first responders hospitalized, and an entire small community shaken — as officials await lab results to confirm what toxic substance caused the tragedy.

New Mexico State Police responded around 11:00 a.m. Wednesday to 306 Hanlon Ave. in Mountainair after the Torrance County Sheriff's Office called for backup on what initially appeared to be a suspected overdose. When first responders arrived, four people were found unresponsive inside the home. Three of those individuals were pronounced dead. One surviving occupant was transported to a hospital for treatment.

The situation rapidly escalated into a full hazmat emergency. Police said 18 first responders were exposed to the substance and transported to UNM Hospital. A total of 23 people were exposed, according to UNMH, and several patients experienced headaches, nausea and vomiting after arriving at the Albuquerque hospital. Eighteen patients who were decontaminated did not develop symptoms and have been discharged, with one still in the process of being discharged. Medical teams continue to monitor three symptomatic patients.

Mountainair EMS Chief Josh Lewis — the first responder to enter the residence — remains hospitalized overnight for observation. Various agencies responded to the incident, including the FBI.

Test Results Still Pending

As of Thursday morning, the substance has not been publicly identified. Mayor Peter Nieto posted on Facebook: "I know many of you are waiting for an update. At this time, the test results have not yet been returned. Law enforcement agencies are prepared to notify the public as soon as we have confirmed information. Testing can take time, but we hope to have more details soon."

In a late Wednesday night update, the mayor said there were still "many unknowns," adding: "We remain committed to being as transparent as possible, and as soon as we receive confirmed information, we will continue to share it with the public." He also announced that Mountainair Town Hall would be closed Thursday — not due to any immediate threat, but because employees and EMTs "experienced an extremely difficult and emotional morning and continue to carry that weight tonight."

Authorities previously indicated that all indications are pointing toward narcotics as a possible factor, though no final conclusions have been confirmed. Public works crews have confirmed the health issues were not related to carbon monoxide or natural gas.

"We Have to Live in Fear"

Volunteer firefighter Antonette Alguire, who helped give CPR to a woman outside the home, described watching EMTs and firefighters begin coughing, vomiting, and becoming dizzy. "I guess we're just going to have to start wearing hazmat suits into these calls and wearing oxygen," she said. "It's getting to that point where we just have to live in fear, even saving lives."

A nearby resident, Xavier Romero, told KRQE: "It is a scary situation. It's just awful. I never thought something like this would happen in Mountainair."

The home sits on a dirt road in a rural subdivision. A single-wide trailer was visible in the backyard, with several cars, trucks and vans in the driveway. A secure perimeter remains in place.

The New Mexico State Police are leading the investigation. Additional updates will be released as test results become available. The public is asked to continue avoiding the area.

Alamogordo Town News will continue to follow this developing story.

SOURCE LINKS

1. KRQE News 13 — Three dead, 18 first responders taken to hospital after hazmat situation in Mountainair

2. The Hill — 3 dead, more than a dozen first responders taken to hospital after hazmat situation in New Mexico town

3. PBS NewsHour / AP — 3 dead and first responders decontaminated in New Mexico after exposure to unknown substance

4. Santa Fe New Mexican — State police: 3 dead, 18 first responders hospitalized in Mountainair substance exposure

5. NM.News — Three dead, 18 first responders hospitalized after hazmat incident at Mountainair home

6. Newsweek — 3 Dead, 18 First Responders Hospitalized by Unknown Substance in New Mexico

7. New Mexico State Police Public Affair 

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