It happened on West Beech Street in Long Beach.
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Arriving officers found an unconscious male in the side yard, and the ensuing investigation found a heat source and chemicals that appeared to be cooking in the garage.
"The Nassau County Fire Marshal's Office hazardous materials team and recon team is presently operating at the scene of a chemical lab in the garage of a private home," authorities said in a statement. "There was one civilian removed by LBFD Ambulance in serious condition."
There are some evacuations, all believed to be precautionary, but police could not say how many.
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The man found outside the garage was taken to the hospital with a head injury. It is unknown know if he sustained an injury in the lab, possibly becoming faint or light-headed and fell, or if he was assaulted, possibly during a robbery attempt.
Authorities later confirmed it to be a methamphetamine lab.
Nassau County police are leading the investigation, assisted by the DEA and the New York State Police.
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