When ships discharge their bilge water the maximum level of hydrocarbons in the water is regulated by various Environmental Protection Agencies, for example there is a limit of 15ppm enforced by the IMO (International Maritime Organisation) in all international waters. Companies breaching these limits are liable to significant fines.
Further regulations have been introduced to control the use of bunker fuels. The Marine Environment Protection Committee (MEPC) of the IMO has approved proposed amendments to the MARPOL Annex VI regulations to reduce harmful emissions from ships.