Garbage piles have appeared along and in between the tracks at the Kosciuszko stop on the J train.
A rider tweeted the NYCTSubway account on Friday morning about the conditions.
The MTA says it will be investigated.
The agency does have portable sweepers and a new vacuum train is in use.
With reports of falling debris, inspections and cleaning has been stepped up.
PIX11 News Reporter Greg Mocker also reported the problem to the MTA.