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MARPOL Optional Annex Annex IV: Regulations for the Prevention
of Pollution by Sewage from Ships

Regulation 1

Definitions

For the purposes of the present Annex:

(1) "New ship" means a ship:

(a) for which the building contract is placed, or in the absence
of a building contract, the keel of which is laid, or which is
at a similar stage of construction, on or after the date of
entry into force of this Annex; or

(b) the delivery of which is three years or more after the date
of entry into force of this Annex.

(2) "Existing ship" means a ship which is not a new ship.

(3) "Sewage" means:

(a) drainage and other wastes from any form of toilets, urinals,
and WC scuppers;

(b) drainage from medical premises (dispensary, sick bay, etc.)
via wash basins, wash tubs and scuppers located in such
premises;

(c) drainage from spaces containing living animals; or

(d) other waste waters when mixed with the drainages defined
above.

(4) "Holding tank" means a tank used for the collection and
storage of sewage.

(5) "Nearest land". The term "from the nearest land" means from
the baseline from which the territorial sea of the territory in
question is established in accordance with international law
except that, for the purposes of the present Convention "from
the nearest land" off the north eastern coast of Australia shall
mean from a line drawn from a point on the coast of Australia in

latitude 1100' South, longitude 14208' East to a point in
latitude 1035' South,

longitude 14155' East, thence to a point latitude 1000' South,

longitude 14200' East, thence to a point latitude 910' South,

longitude 14352' East, thence to a point latitude 900' South,

longitude 14430' East, thence to a point latitude 1300' South,

longitude 14400' East, thence to a point latitude 1500' South,

longitude 14600' East, thence to a point latitude 1800' South,

longitude 14700' East, thence to a point latitude 2100' South,

longitude 15300' East, thence to a point on the coast of
Australia in latitude 2442' South,

longitude 15315' East.

Regulation 2

Application

The provisions of this Annex shall apply to:

(a) (i) new ships of 200 tons gross tonnage and above;

(ii) new ships of less than 200 tons gross tonnage which are
certified to carry more than 10 persons;

(iii) new ships which do not have a measured gross tonnage and
are certified to carry more than 10 persons; and

(b) (i) existing ships of 200 tons gross tonnage and above, 10
years after the date of entry into force of this Annex;

(ii) existing ships of less than 200 tons gross tonnage which
are certified to carry more than 10 persons, 10 years after the
date of entry into force of this Annex; and

(iii) existing ships which do not have a measured gross tonnage
and are certified to carry more than 10 persons, 10 years after
the date of entry into force of this Annex.

Regulation 3

Surveys

(1) Every ship which is required to comply with the provisions
of this Annex and which is engaged in voyages to ports or
offshore terminals under the jurisdiction of other Parties to
the Convention shall be subject to the surveys specified below:

(a) An initial survey before the ship is put in service or
before the Certificate required under Regulation 4 of this Annex
is issued for the first time, which shall include a survey of
the ship which shall be such as to ensure:

(i) when the ship is equipped with a sewage treatment plant the
plant shall meet operational requirements based on standards and
the test methods developed by the Organization;

(ii) when the ship is fitted with a system to comminute and
disinfect the sewage, such a system shall be of a type approved
by the Administration;

(iii) when the ship is equipped with a holding tank the capacity
of such tank shall be to the satisfaction of the Administration
for the retention of all sewage having regard to the operation
of the ship, the number of persons on board and other relevant
factors. The holding tank shall have a means to indicate
visually the amount of its contents; and

(iv) that the ship is equipped with a pipeline leading to the
exterior convenient for the discharge of sewage to a reception
facility and that such a pipeline is fitted with a standard
shore connection in compliance with Regulation 11 of this Annex.

This survey shall be such as to ensure that the equipment,
fittings, arrangements and material fully comply with the
applicable requirements of this Annex.

(b) Periodical surveys at intervals specified by the
Administration but not exceeding five years which shall be such
as to ensure that the equipment, fittings, arrangements and
material fully comply with the applicable requirements of this
Annex. However, where the duration of the International Sewage
Pollution Prevention Certificate (1973) is extended as specified
in Regulation 7(2) or (4) of this Annex, the interval of the
periodical survey may be extended correspondingly.

(2) The Administration shall establish appropriate measures for
ships which are not subject to the provisions of paragraph (1)
of this Regulation in order to ensure that the provisions of
this Annex are complied with.

(3) Surveys of the ship as regards enforcement of the provisions
of this Annex shall be carried out by officers of the
Administration. The Administration may, however, entrust the
surveys either to surveyors nominated for the purpose or to
organizations recognized by it. In every case the Administration
concerned fully guarantees the completeness and efficiency of
the surveys.

(4) After any survey of the ship under this Regulation has been
completed, no significant change shall be made in the equipment,
fittings, arrangements, or material covered by the survey
without the approval of the Administration, except the direct
replacement of such equipment or fittings.

Regulution 4

lssue of Certificate

(1) An International Sewage Pollution Prevention Certificate
(1973) shall be issued, after survey in accordance with the
provisions of Regulation 3 of this Annex, to any ship which is
engaged in voyages to ports or offshore terminals under the
jurisdiction of other Parties to the Convention.

Regulation 5

Issue of a Certificate by another Government

(1) The Government of a Party to the Convention may, at the
request of the Administration, cause a ship to be surveyed and,
if satisfied that the provisions of this Annex are complied
with, shall issue or authorize the issue of an International
Sewage Pollution Prevention Certificate (1973) to the ship in
accordance with this Annex.

(2) A copy of the Certificate and a copy of the survey report
shall be transmitted as early as possible to the Administration
requesting the survey.

(3) A Certificate so issued shall contain a statement to the
effect that it has been issued at the request of the
Administration and it shall have the same force and receive the
same recognition as the Certificate issued under Regulation 4 of
this Annex.

(4) No International Sewage Pollution Prevention Certificate
(1973) shall be issued to a ship which is entitled to fly the
flag of a State, which is not a Party.

Regulation 6

Form of Certificate

The International Sewage Pollution Prevention Certificate (1973)
shall be drawn up in an official language of the issuing country
in the form corresponding to the model given in the Appendix to
this Annex. If the language used is neither English nor French,
the text shall include a translation into one of these
languages.

Regulation 7

Duration of Certificate

(1) An International Sewage Pollution Prevention Certificate
(1973) shall be issued for a period specified by the
Administration, which shall not exceed five years from the date
of issue, except as provided in paragraphs (2), (3) and (4) of
this Regulation.

(2) If a ship at the time when the Certificate expires is not in
a port or offshore terminal under the jurisdiction of the Party
to the Convention whose flag the ship is entitled to fly, the
Certificate may be extended by the Administration, but such
extension shall be granted only for the purpose of allowing the
ship to complete its voyage to the State whose flag the ship is
entitled to fly or in which it is to be surveyed and then only
in cases where it appears proper and reasonable to do so.

(3) No Certificate shall be thus extended for a period longer
than five months and a ship to which such extension is granted
shall not on its arrival in the State whose flag it is entitled
to fly or the port in which it is to be surveyed be entitled by
virtue of such extension to leave that port or State without
having obtained a new Certificate.

(4) A Certificate which has not been extended under the
provisions of paragraph (2) of this Regulation may be extended
by the Administration for a period of grace of up to one month
from the date of expiry stated on it.

(5) A Certificate shall cease to be valid if significant
alterations have taken place in the equipment, fittings,
arrangement or material required without the approval of the
Administration, except the direct replacement of such equipment
or fittings.

(6) A Certificate issued to a ship shall cease to be valid upon
transfer of such a ship to the flag of another State, except as
provided in paragraph (7) of this Regulation.

(7) Upon transfer of a ship to the flag of another Party, the
Certificate shall remain in force for a period not exceeding
five months provided that it would not have expired before the
end of that period, or until the Administration issues a
replacement Certificate, whichever is earlier. As soon as
possible after the transfer has taken place the Government of
the Party whose flag the ship was formerly entitled to fly shall
transmit to the Administration a copy of the Certificate carried
by the ship before the transfer and, if available, a copy of the
relevant survey report.

Regulation 8

Discharge of Sewage

(1) Subject to the provisions of Regulation 9 of this Annex, the
discharge of sewage into the sea is prohibited, except when:

(a) the ship is discharging comminuted and disinfected sewage
using a system approved by the Administration in accordance with
Regulation 3(1)(a) at a distance of more than four nautical
miles from the nearest land, or sewage which is not comminuted
or disinfected at a distance of more than 12 nautical miles from
the nearest land, provided that in any case, the sewage that has
been stored in holding tanks shall not be discharged
instantaneously but at a moderate rate when the ship is en route
and proceeding at not less than 4 knots; the rate of discharge
shall be approved by the Administration based upon standards
developed by the Organization; or

(b) the ship has in operation an approved sewage treatment plant
which has been certified by the Administration to meet the
operational requirements referred to in Regulation 3(1)(a)(i) of
this Annex, and

(i) the test results of the plant are laid down in the ship's
International Sewage Pollution Prevention Certificate (1973);

(ii) additionally, the effluent shall not produce visible
floating solids in, nor cause discolouration of, the surrounding
water; or

(c) the ship is situated in the waters under the jurisdiction of
a State and is discharging sewage in accordance with such less
stringent requirements as may be imposed by such State.

(2) When the sewage is mixed with wastes or waste water having
different discharge requirements, the more stringent
requirements shall apply.

Regulation 9

Exceptions

Regulation 8 of this Annex shall not apply to:

(a) the discharge of sewage from a ship necessary for the
purpose of securing the safety of a ship and those on board or
saving life at sea; or

(b) the discharge of sewage resulting from damage to a ship or
its equipment if all reasonable precautions have been taken
before and after the occurrence of the damage, for the purpose
of preventing or minimizing the discharge.

Regulation 10

Reception Facilities

( 1) The Government of each Party to the Convention undertakes
to ensure the provision of facilities at ports and terminals for
the reception of sewage, without using undue delay to ships,
adequate to meet the needs of the ships using them.

(2) The Government of each Party shall notify the Organization
for transmission to the Contracting Governments concerned of all
cases where the facilities provided under this Regulation are
alleged to be inadequate.

Regulation 11

Standard Discharge Connections

Omitted

Appendix

Form of Certificate

Omitted