Antibiotic drug residues were found in some urine samples from pigs in a Sheung Shui slaughterhouse.
The drug, chloramphenicol (CAP), is used to treat serious infections in humans and animals, public broadcaster RTHK reports.
Secretary for Food and Health Ko Wing-man said the findings are a “serious problem”.
Authorities are investigating how CAP, a potential carcinogen, was introduced into the animals.
They said it might have been done intentionally or ingested from pig fodder and other external sources.
Hong Kong’s public health ordinance bans the use of CAP in food-producing animals.
Offenders are liable to a maximum fine of US$100,000 (US$12,900) if convicted.
The US National Library of Medicine describes CAP as a potential cancer agent.
It’s banned in food-producing animals in the US, Canada, Australia, Japan, China and the European Union.
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