Singapore legislation
Regulation 4
of Prevention of Pollution of the Sea (Sewage) Regulations 2005
Regulation 4
Discharge of sewage
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.