A plumber found a fetus in a drain pipe at a Brooklyn home Tuesday, police sources said.

The human remains were found at a house on East 83rd Street in Canarsie.

A plumber doing work on the main sewer line in the basement made the grisly discovery, cops said.

Authorities were questioning a woman who lives in the two-family home and may have been pregnant in October, according to sources.

Police notified the city Medical Examiner’s Office and their investigation is ongoing.