The International Sewage Pollution Prevention Certificate (ISPPC) is a mandatory statutory document issued under MARPOL Annex IV, which deals with the prevention of pollution by sewage from ships. It confirms that a vessel is constructed, equipped, and operated in compliance with international regulations to prevent the discharge of untreated sewage into the sea.
What is the ISPPC?
The ISPPC is issued by the Flag State Administration or its Recognized Organization (RO) (usually a classification society) after surveys confirm compliance with MARPOL Annex IV requirements.
It applies to:
Ships of 400 GT and above engaged in international voyages.
Ships certified to carry more than 15 persons (including passengers and crew).
Without this certificate, ships are not legally allowed to discharge sewage, even when treated, in international waters.
Key Areas Covered by the ISPPC
- Sewage Treatment Systems
Approval of an onboard sewage treatment plant that meets IMO effluent standards.
System must reduce bacteria, suspended solids, and oxygen demand before discharge.
- Sewage Comminuting and Disinfecting Systems
Ships may alternatively fit comminuting (grinding) and disinfecting units.
Discharge is permitted only when the ship is at least 3 nautical miles from the nearest land.
- Sewage Holding Tanks
Ships without treatment plants must have sewage holding tanks of adequate capacity.
Discharge is permitted only when the ship is at least 12 nautical miles from the nearest land, and sewage is discharged at a moderate rate while the ship is en route.
- Survey Requirements
Initial Survey: Before the ship enters service.
Renewal Survey: At intervals not exceeding 5 years.
Intermediate Survey: Between the 2nd and 3rd anniversary date.
Annual Surveys: Endorsements confirming continued compliance.
- Operational Provisions
Ships must maintain a sewage management plan approved by the administration.
Crew must follow sewage discharge regulations and log entries where required.
Details in the ISPPC
Name of the ship, IMO number, port of registry, and gross tonnage.
Description of sewage treatment system, comminuting/disinfecting system, or holding tank capacity.
Dates and endorsements of surveys.
Confirmation of compliance with MARPOL Annex IV regulations.
Validity and Endorsements
Validity: Maximum of 5 years, provided annual/intermediate endorsements are maintained.
If equipment becomes defective or the ship fails an inspection, the certificate may be withdrawn or suspended.
Importance of the ISPPC
- Environmental Protection – Prevents untreated sewage from polluting coastal waters and harbors.
- Crew and Passenger Health – Reduces the risk of disease transmission from contaminated waters.
- Regulatory Compliance – Mandatory under MARPOL Annex IV for applicable vessels.
- Port State Control (PSC) – Frequently checked during inspections.
- International Legality – Ships cannot legally discharge sewage without a valid ISPPC.
Conclusion
The International Sewage Pollution Prevention Certificate (ISPPC) is an essential document that ensures ships manage and discharge sewage in a controlled, environmentally responsible manner. By mandating proper treatment, storage, and discharge practices, MARPOL Annex IV plays a vital role in protecting marine ecosystems and safeguarding public health.
