Regulation 4
Discharge of sewage
of Prevention of Pollution of the Sea (Sewage) Regulations 2005
For the purposes of regulation 11.2 of Annex IV, the discharge of sewage in Singapore waters is prohibited, except when —
the ship discharges —
comminuted and disinfected sewage using a system approved in accordance with regulation 9.1.2 of Annex IV, at a distance of 3 nautical miles or more from the nearest land; or
sewage which is not comminuted or disinfected at a distance of 12 nautical miles or more from the nearest land, provided that in any case, sewage that has been stored in holding tanks shall be discharged at a rate approved by the Director based on standards developed by the IMO and accepted by the Government when the ship is en route and proceeding at not less than 4 knots; or
the ship has in operation a sewage treatment plant approved in accordance with regulation 9.1.1 of Annex IV —
where the test results of the plant are laid down in the ship’s ISPP Certificate; and
the effluent so discharged shall not produce visible floating solids nor cause discolouration of the surrounding water.