Review Article
A Review of On-Site Wastewater Treatment Systems in Western Australia from 1997 to 2011
Table 1
OWTS approved by LG (1997–2011).
| System type | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Septic tank | 322 | 546 | 782 | 795 | 618 | 630 | 655 | 687 | 556 | 616 | 693 | 753 | 615 | 688 | 626 | ATU | 49 | 61 | 73 | 50 | 36 | 44 | 63 | 125 | 189 | 149 | 177 | 197 | 155 | 241 | 214 | Treatment plant | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 3 | Composting toilet | 2 | 0 | 0 | 2 | 3 | 2 | 2 | 0 | 1 | 3 | 3 | 1 | 1 | 1 | 2 | Others | 0 | 7 | 7 | 11 | 9 | 16 | 24 | 17 | 35 | 58 | 56 | 61 | 48 | 46 | 41 | System not specified | 130 | 90 | 3 | 14 | 60 | 49 | 41 | 54 | 43 | 72 | 18 | 20 | 13 | 11 | 39 |
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