As per new regulation 77/2019 in force since February 02nd local goverment sanitary agency (SENASA) does not decide when a vessel has to land garbage.
Now on vessel's arrival, forms with details on vessel's garbage on board shall be presented to Coast Guard (as it was already done) and they are the ones that can order and control the landing in case needed. SENASA's role shall be supervising the correct disposal of wastes once at shore. Only in cases where Coast Guard deems necessary SENASA may embark for an inspection, and only after CG's authorization to do so.
Hopefully this will avoid SENASA's explotation of previous regulations where garbage was being landed on most vessels (whether it was really necessary or not)
Keep you posted.