The city’s Streets and Sanitation commissioner agrees with some aldermen and recycling advocates that the department could use help from another city department to make sure large apartment and office buildings separate recyclables, he said Wednesday.

Members of the City Council Committee on Ethics and Government Oversight and the Committee on Environmental Protection and Energy on Wednesday grilled streets and sanitation department leaders, Inspector General Joseph Ferguson and Chief Sustainability Officer Angela Tovar on why the city’s recycling program for large buildings is not being properly enforced.