Is Used Cooking Oil Flammable, Combustible, Or Just Ugly?

Where and for how long is used oil allowed 
to be stored outside in the City of Hudson?

It was at least four months ago when I first noticed two nearly full containers of used cooking oil on the ground outside a side door to the Hudson Central Fire Station at the corner of Washington & North 7th.  Now there are eight of them, with only the eaves above offering protection.  Since meals are served to the elderly every weekday in the building, I'm thinking that some food is prepared in an oil fryer. Of course, the building is also the temporary location of City Hall offices.

Used cooking oil, also known as waste.

Is the person in charge of the meal preparation hoping that someone will come along and take the oil containers away sometime this year?  Or are they storing their used oil outside without any plan to dispose of it properly?  Would they be okay if some rascally children decided to dump all the oil in the street or on the sidewalk and see what happens to the next vehicle or pedestrian that passes?  Would the important people in City Hall (that building!) be okay if every eatery in town that produces used cooking oil just left their containers outside for months, 25 feet from a sidewalk for all to see and with no plan for proper disposal?  What would Kamal Johnson say, if anything?  Hell, maybe that's the oil he's been using to grease the wheels of his fine-tuned political machine!