The obituaries have a certain sameness to them: full of praise and regret for lives cut short, marked by telltale details and omissions. The deaths occurred at home, or at a friend’s house elsewhere on Staten Island. The mourned were often young and white, and although how they died was never mentioned, nearly everyone knew or suspected the cause.

A 23-year-old man, a cello student in high school and the son of an elevator company vice president died in March. A former high school hockey player who delivered newspapers died in 2013 at 22. Another 23-year-old man who was working construction died at home in July 2012. Family members and autopsy reports revealed that they died from heroin or combinations of drugs including heroin.

Staten Island, long a blue-collar bastion of police officers and other New York City workers, is confronting a heroin epidemic.

Thirty-six people died from heroin overdoses in 2012, the highest number in at least a decade, according to the most recent available city health department records; the death rate was higher than the city’s other four boroughs had seen in 10 years. The amount of heroin seized by the Police Department on Staten Island has jumped more than 300 percent from 2011 to 2013, and this year shows no sign of abating: Through April 13, officers seized roughly 1,700 glassine bags of heroin, up from about 1,200 bags over the same period in 2013. That number does not include the 347 bags seized on Wednesday in raids at an auto-repair shop and its owner’s home.