Table 1.
WHO health risk levels derived from the mean concentrations of Escherichia coli as determined by Colilert and the CBT in water samples collected from 35 households in western Kenya and included stored drinking water (N = 31) and source water (N = 21)
| Colilert—Frequency of water samples in each WHO health risk level (N = 52) | ||||||
|---|---|---|---|---|---|---|
| Low risk/safe (< 1 MPN/100 mL) | Intermediate risk (1–10 MPN/100 mL) | High risk (> 10–100 MPN/100 mL) | Very high risk (> 100 MPN/100 mL) | Total | ||
| CBT—frequency of water sample in each WHO health risk level (N = 52) | < 1 MPN/100 mL | 14 | 1 | 0 | 0 | 15 |
| 93.3% | 6.7% | 0% | 0% | 28.8% | ||
| 1–10 MPN/100 mL | 1 | 3 | 0 | 0 | 4 | |
| 25% | 75% | 0% | 0% | 7.7% | ||
| 10–100 MPN/100 mL | 3 | 6 | 1 | 1 | 11 | |
| 27.3% | 54.5% | 9.1% | 9.1% | 21.2% | ||
| > 100 MPN/100 mL | 1 | 0 | 0 | 21 | 22 | |
| 4.5% | 0% | 0% | 95.5% | 42.3% | ||
| Total | 19 | 10 | 1 | 22 | 52 | |
| 36.5% | 19.3% | 1.9% | 42.3% | 100% | ||
CBT = compartment bag test; WHO = World Health Organization.