Table 3.
Total Coliform and Escherichia coli Concentrations from Household Stored Water Samples (N) in Different Seasons and from Different Water Sources in Two Communities
| Number of samples | Total coliforms |
Total coliforms |
E. coli |
||
|---|---|---|---|---|---|
| Mean ± SD, MPN/100 mL | 95% CI, MPN/100 mL | % positive (N) | % positive (N) | ||
| All samples | 309 | 45 ± 179 | 25–65 | 30 (92) | 2 (5) |
| Samples by source | |||||
| WTP | 258 | 39 ± 164 | 19–59 | 27 (69) | ≤1 (2) |
| Rain | 31 | 81 ± 250 | 0–172 | 55 (17) | 10 (3) |
| River | 15 | 69 ± 261 | 0–213 | 20 (3) | 0 (0) |
| Snow | 5 | 76 ± 141 | 0–251 | 60 (3) | 0 (0) |
| Samples by season | |||||
| Winter | 66 | 21 ± 125 | 0–52 | 20 (13) | 0 (0) |
| Spring | 70 | 58 ± 215 | 7–109 | 27 (19) | 0 (0) |
| Summer | 92 | 72 ± 228 | 5–94 | 33 (30) | 5 (5) |
| Fall | 81 | 23 ± 99 | 1–45 | 37 (30) | 0% (0) |