Western Australian Current Regulations Western Australian Current Regulations (1) The Chief Health
Officer shall not approve the use of minimum flush fixtures and fittings on
any land unless —
(a) the
pan is mounted within 2.4 m of the septic tank; and
(b) the
pan compartment is detached from the residential premises or, if attached to
the residential premises, at least 2 sides are external walls, has no
opening to the inside of the residential premises and no opening to the pan
compartment is within 915 mm of any opening to the residential premises;
and
(c) the
dimensions and construction of the compartment shall be in accordance with the
by‑laws in force under the Act but, in addition, fixed glass louvres of
not less than 0.19 m 2 shall be provided in one of the external walls and any
screens or partitions erected for the purpose of securing privacy are so
placed as not to interfere with adequate fresh air ventilation of the pan
compartment; and
(d) a
water supply of not less than 9 kl is available to the land.
(2) Fixtures and
fittings approved by the Chief Health Officer under this regulation shall not
be connected to septic tanks to serve residential premises containing more
than 5 bedrooms or to tanks treating all household wastes.
(3) Notwithstanding
Part 3, a septic tank connected to the fixtures and fittings referred to in
this Part shall —
(a) have
a liquid capacity of at least 1 820 litres; and
(b)
where the tank is cylindrical, have a cylindrical diameter of at least
1 520 mm; and
(c)
where the tank is rectangular, have a length that is at least twice its width,
and effluent from the
tank shall be disposed of within the boundary of the premises on which the
tank is situated by one of the means approved under Part 7.
(4) Notwithstanding
the provisions of regulation 38(2) —
(a)
where a water seal is used, the depth approved by the Chief Health Officer of
the seal shall be maintained after flushing; and
(b)
where there is no water seal, the sealing device shall be such that 570 ml of
water poured into the pan above the seal will not leak past the seal in less
than 20 seconds; and
(c) the
inspecting officer shall from time to time after the installation has been
completed repeat the test on the seal and where the seal is defective shall
require the owner by notice in writing within a time specified in such notice
to repair or adjust the seal, or both, so that the test will be passed.
[Regulation 39 amended: Gazette
29 Jun 1984 p. 1781; 15 Dec 1989 p. 4549;
29 Jul 1997 p. 4079 and 4083; 10 Jan 2017
p. 287‑8.]