Table 3.
Lead concentration and physical properties of water samples and the comparison with available standards
| Parameters | Lead concentration in first-flushed water (µg/L) | Lead concentration in fully-flushed water (µg/L) | Temperature (°C) | pH | Conductivity (µS/cm) | Total Dissolved Solids, TDS (mg/L) |
|---|---|---|---|---|---|---|
| Mean | 3.041 | 1.064 | 26.86 | 8.19 | 25.75 | 12.87 |
| Median | 1.313 | 0.702 | 27.35 | 8.08 | 26.30 | 13.15 |
| Std Deviation | 6.967 | 1.103 | 2.44 | 0.48 | 2.31 | 1.15 |
| 5th Percentile | 0.169 | 0.034 | 20.91 | 7.66 | 21.41 | 10.71 |
| 10th Percentile | 0.479 | 0.079 | 23.13 | 7.76 | 22.04 | 11.22 |
| 25th Percentile | 0.675 | 0.370 | 26.23 | 7.91 | 24.2 | 12.1 |
| Median | 1.313 | 0.702 | 27.35 | 8.08 | 26.3 | 13.15 |
| 75th Percentile | 2.546 | 1.445 | 28.3 | 8.31 | 27.3 | 13.68 |
| 90th Percentile | 5.297 | 2.473 | 29.09 | 8.73 | 28.3 | 14.1 |
| 95th Percentile | 8.133 | 4.057 | 30.47 | 9.58 | 28.7 | 14.3 |
| Min value | 0.097 | 0.000 | 19.2 | 7.16 | 16.88 | 8.4 |
| Max value | 56.490 | 5.215 | 31.6 | 9.79 | 30.60 | 15.3 |
| Drinking water standards | 10a | 10a | Not available | 6.5-9a | 500b | 1000a |
a
National Drinking Water Quality Standard 2009
b
Water Supply (Water Quality) Regulations 1989