Water and Sewerage Regulation 2001

The following requirements are prescribed:

if a closet pan and cistern are to be installed—the pan must be a reduced-flush closet pan and the cistern a dual-flush reduced volume cistern;

if a closet pan only is to be installed—the pan must be a reduced‑flush closet pan;

if a cistern is to be installed that is connected to an existing full‑flush closet pan—the cistern must be a separate dual-flush cistern that—

is of at least 11L capacity; and

gives an effective full-flush not larger than 10L, and for test purposes, 9L; and

gives an effective half-flush not larger than 5.5L, and for test purposes, 4.5L;

if a cistern is to be installed that is connected to an existing reduced-flush closet pan—the cistern must be a dual-flush reduced volume cistern;

if a closet pan is to be flushed with water drawn from a central storage cistern installed before 1 January 1994 and—

the pan is a full-flush closet pan—the pan must be flushed with an effective full-flush not exceeding 10L and for test purposes, 9L; or

the pan is a reduced-flush closet pan—the pan must be flushed with an effective full-flush not exceeding 10L and for test purposes, either 6L or 9L;

the pan may be flushed with a half-flush of at least 4.5L and not exceeding 5.5L if a full-flush closet pan is to be flushed—

with water drawn from a central storage cistern; and

by control fittings that allow the user to decide whether to give a full-flush or half-flush;

the pan may be flushed with a half-flush of at least 3L and not exceeding 4L if a reduced-flush closet pan is to be flushed—

with water drawn from a central storage cistern; and

by control fittings that allow the user to decide whether to give a full-flush or half-flush;

if a central storage cistern installation is to be installed—

reduced-flush closet pans must be installed; and

control fittings must be installed that automatically control the amount of water used in a way that each flush uses—

on a full-flush—at least 6L and not exceeding 7L; or

on a half-flush—at least 3L and not exceeding 4L.

In this section:

dual-flush reduced volume cistern means a cistern that has the capacity to—

give an effective full-flush not exceeding 7L and for test purposes 6L; and

give an effective half-flush not exceeding 4L and for test purposes 3L.

full-flush closet pan means a closet pan that is a full-flush pan under AS 1172, as in force from time to time.

reduced-flush closet pan means a closet pan that is a reduced-flush pan under AS 1172, as in force from time to time.