Table 1.
Physicochemical properties of water in distribution systems BCV and PCFa
| Water distribution system and source | Temp (°C ± SD) | pH ± SD | NH4+ (mg/liter ± SD) | NO3− (mg/liter ± SD) | Total Cl2 (mg/liter ± SD) | TOC (mg/liter ± SD) |
|---|---|---|---|---|---|---|
| BCV | ||||||
| First draw | 20.8 ± 2.8 | 7.85 ± 0.24 | 0.58 ± 0.15 | 0.35 ± 0.05 | 2.02 ± 0.63 | 2.56 ± 1.18 |
| Postflushing | 19.7 ± 2.4* | 7.85 ± 0.23* | 0.63 ± 0.14 | 0.34 ± 0.05 | 2.21 ± 0.63 | 2.36 ± 2.96 |
| Water heater | 37.3 ± 8.4 | 8.02 ± 0.32 | 0.64 ± 0.10 | 0.37 ± 0.05 | 1.81 ± 0.62 | 2.87 ± 3.00 |
| PCF | ||||||
| Postflushing | 26.8 ± 0.9* | 7.63 ± 0.21* | 0.45 ± 0.36 | 0.25 ± 0.21 | 2.15 ± 1.13 | 3.51 ± 2.68 |
| Water heater | 43.2 ± 6.0 | 7.66 ± 0.24 | 0.47 ± 0.33 | 0.24 ± 0.22 | 1.27 ± 0.93 | 5.84 ± 2.51 |
a
The first draw data from PCF was not available. *, significant difference with 95% confidence (P < 0.05) in postflushing sample results between BCV and PCF.