Prevention of pollution by sewage from ships.

Annex IV entered into force on September 27, 2003, and applies to ships of 400 GT and above and ships below 400 GT that are certified to carry more than 15 persons.

Annex IV contains a set of regulations regarding the discharge of sewage into the sea, ships' equipment and systems for the control of sewage discharge and requirements for survey and issuance of International Sewage Pollution Prevention Certificates (ISPP).

DNV has been authorized by numerous flag administrations to issue International Sewage Pollution Prevention Certificates (ISPP).