To report illegal dumping that has been witnessed (not loose litter) in a City of Toronto park, ravine/trail, you can submit a service request online at https://www.toronto.ca/311 , or call 311.
To report illegal dumping that has not been witnessed, you also submit a service request online at https://www.toronto.ca/311 , or call 311.
For Rouge Park & Tommy Thompson Park (Leslie St. Spit), contact the Toronto & Region Conservation Authority
To report litter or illegal dumping at the front of the Provincial Legislature (Queen's Park Circle) you must contact Precinct Properties with the Provincial Government.