A Review of On-Site Wastewater Treatment Systems in Western Australia from 1997 to 2011

Table 4

Type of OWTS approved by DOHWA periods 1997–2011.

Number	Location	System type	Year															Total	Total per LG
			97	98	99	00	01	02	03	04	05	06	07	08	09	10	11
1	Belmont	ATU				1										3		4	25
		Unknown				5	2			1		1		1	4	2	5	21
2	Cockburn	Septic tank	19	6	9	5	3		7	8	4	3	8	3	3	5	1	84	89
		ATU	1	1	2			1										5
3	Cue	Septic tank												2				2	3
		Treatment plant													1			1
4	Dandaragan	Septic tank			27	47	31	36										141	141
5	Derby	Unknown	39	38	17	22	29	34	29	13	8	15	17	15	6	14	9	305	305
6	Donnybrook-Balingup	Unknown															1	1	1
7	Esperance	Septic tank						1	1	1				3	3	1	3	13	24
		ATU												1	2	2	3	8
		Composting toilet										1						1
		Others												1			1	2
8	Fremantle	Septic tank	1	1										1				3	4
		Composting toilet				1												1
9	Gosnells	Septic tank												1				1	3
		ATU										1					1	2
10	Joondalup	Septic tank	10	1			1											12	12
11	Kalamunda	Septic tank									3	2	3	2	4	6	4	24	48
		ATU									3	2		5	3	3	3	19
		Treatment plant															1	1
		Others											1	1		2		4
12	Manjimup	Septic tank	6	14	11	7	15	8	8	4	2	4		3				82	92
		ATU	1	1	2	1						2		2				9
		Composting toilet					1											1
13	Mundaring	Septic tank	1	1	1	5	3		2		1	9	10	9		5	14	61	76
		ATU		2	1	1		2				1	1			2	2	12
		Greywater								1								1
		NRS										2						2
14	Murchison	Treatment plant												2				2	2
15	Plantagenet	Septic tank										1		1				2	2
16	Port Hedland	Septic tank											9	24	26	13	22	94	114
		ATU											1	1	2	2	4	10
		Treatment plant															1	1
		Others											3	1	1	1	3	9
17	Serpentine-Jarrahdale	Septic tank												1	1	2		4	13
		ATU											1	1	1	4	2	9
18	Stirling	Septic tank	8	20	14	7	8			1		1	1					60	69
		ATU		3	2	3	1											9