In 1998, Silja Line collected approx. Since 1998 the personnel on board have regular systematic environmental courses were they are taught how to minimise the impact of waste on the environment. Lectures for groups of passengers can be realised upon request. Since the beginning of the 1990s, the ships have been using low-sulphur fuel, and catalytic exhaust emission control has been introduced. The large ships deliver 100 per cent of the wastewater to facilities ashore.
Solid waste is sorted on board and recycling stations have been set up ashore.