TABLE 1.
Bacterial water quality data for samples taken from of the distribution networks of urban and semiurban areas
| Bacteria | Measurement | Value for:
|
|||
|---|---|---|---|---|---|
| Pretoria (31)a | Pietermaritzburg (20) | Botshabelo (5) | Towns (22) | ||
| Heterotrophic plate counts | |||||
| In water (CFU · ml−1) | Minimum | 10 | NDb | ND | ND |
| Maximum | 3 × 108 | 3 × 108 | 3 × 108 | 3 × 108 | |
| Geometric mean | 1.2 × 104 | 1.7 × 104 | 4 × 106 | 1.8 × 104 | |
| In biofilm (CFU · cm−2) | Minimum | 30 | 30 | 3 × 108 | 7,400 |
| Maximum | 3 × 108 | 2 × 109 | 3 × 108 | 6 × 107 | |
| Geometric mean | 3.2 × 105 | 1.4 × 105 | 3 × 108 | 8.6 × 105 | |
| NTM (CFU · cm−2) | Minimum | ND | ND | ND | ND |
| Maximum | 2,300 | 9,300 | ND | 4.6 × 105 | |
| Geometric mean | 3 | 0 | ND | 0 | |
| Fecal coliforms (CFU · 100 ml−1) | Minimum | ND | ND | ND | ND |
| Maximum | ND | 163 | ND | 3 | |
| Geometric mean | ND | 0 | ND | 0 | |
a
Number of sites sampled is given in parentheses.
b
ND, not detected.