on
this link,
the institudo estadual do ambiente (inea)provides the
suitability of several
beaches on paquetá island, including
praia da imbuca, that can be used to guess water quality at
praia dos frades.
constantly updated, the red flags mean that swimming is not
advisable, green flags mean waters are clean, and yellow
flags suggest using own judgment.
any of rio's beaches
may have polluted
waters within 24 to 48 hours following heavy rains.