You are here: Home > Water > Key performance indicators

Key performance indicators

 

2006/07
2007/08
Target
Result
Target
Result
Target met
Production/storage  
Operate water supply system within
environmental requirements (% compliance)
100
99.58
100
99.58*
√
Contribute to the Government’s
15% water conservation target (%)
2.5
2.8
2.9
4.2
√ √
Water transfer  
Reduce system losses as a percentage of water supplied to retail water businesses (%)
0.76
1
< 1
0.98
√ √
Compliance with retail water business pressure requirements as set out in the Bulk Water Service Agreements (BWSAs) (%)
99.6
99.9
99.6
100
√
Water quality  
Compliance with BWSA water quality
requirements (%)
• Microbiological standards (E.coli)
99.99
100
99.99
100
√ √
• Disinfection by-products
100
100
100
100
√
• Aesthetics (turbidity)
86.8
91.7.5
86.8
79.4*
X
• Aesthetics (aluminium)
99.9
98.2
99.9
99.75**
X
√ Target met      √√ Target exceeded      X Target not met


*Target was not achieved mainly due to high turbidity in the source water from Upper Yarra Reservoir caused by the June 2007 storm event.

**Target was not achieved due to two results from the Yan Yean supply to Whittlesea in which the pH stabilisation exceeded BWSA standards. Plant operations were reviewed and no reasons for the higher aluminium level were identified. However, the higher results could be connected with the shutdown of the plant, where a residual volume of water remains in the tank until the next time the reservoir starts up.