On April 22, 2016 the International Maritime Organization announced that ships and ferries would be banned from dumping untreated wastewater into the Baltic.
The ban is set to come into force in 2019 for newer ships and in 2021 for older vessels. The ban is chiefly directed towards the large ships that cruise the Gulf of Finland in the summer.
The Baltic Marine Environment Protection Commission, HELCOM, works to protect the marine environment of the Baltic Sea, and has been campaigning for the sea-dumping ban for the past decade.
Hermanni Backer, the professional secretary of HELCOM's maritime, response and fish departments, said that once the measure goes into effect, the Baltic will be the world's first sea region which outright bans passenger vessels' commonplace sewage-dumping practices.
Nearly 300 international cruise ships visit Helsinki every year, and with them arrives tonnes of dirty, untreated wastewater.
HELCOM estimates that the city's harbours host some seven million tourist overnight stays via the visiting cruise ships – which adds up to a lot of sewage. But those days will be over relatively soon.
Even though there is a transition period five years for vessels which are already in use, Backer said that the decision is good for the Baltic.