Western Australian Current Regulations

HEALTH (TREATMENT OF SEWAGE AND DISPOSAL OF EFFLUENT AND LIQUID WASTE) REGULATIONS 1974 - REG 28

28 .         Liquid capacity of septic tanks on residential premises

        (1)         Every septic tank described in column 1 of the Table serving or to serve residential premises with the number of bedrooms specified in column 2 of the Table shall have a liquid capacity of at least that specified in column 3 of the Table opposite the relevant entries in columns 1 and 2 of the Table.

        (2)         Notwithstanding subregulation (1), if a septic tank serves or is to serve residential premises used by more than 100 people, the liquid capacity of the tank shall be as approved by the Chief Health Officer.

Table

Type of tank	Number of bedrooms	Liquid capacity (litres)
Septic tank serving water closets and urinals only	5 or less	1 820
	more than 5	1 360 plus 90 litres per bedroom
Septic tank treating all wastes	5 or less	3 180
	more than 5	1 820 plus 270 litres per bedroom

        [Regulation 28 inserted: Gazette 15 Dec 1989 p. 4549; amended: Gazette 29 Jul 1997 p. 4078; 7 Jan 2005 p. 68; 10 Jan 2017 p. 287‑8.]