Table 2. Microorganisms identified in Xochimilco-canal water samples.
| Isolated microorganisms | Rainy season (n = 37) | Dry season (n = 37) |
| Total coliforms | ||
| Escherichia coli | 24 | 63 |
| Klebsiella pneumoniae | 15 | 45 |
| Klebsiella oxytoca | 3 | 14 |
| Enterobacter cloacae | 10 | 34 |
| Enterobacter aerogenes | 3 | - |
| Citrobacter freundii | 1 | 1 |
| Proteus mirabilis | 1 | - |
| Providencia rettgeri | - | 4 |
| Serratia odorifera | 9 | - |
| Salmonella arizona | 2 | - |
| Hafnia alvei | - | 6 |
| Fecal coliforms | ||
| Escherichia coli | 57 | 69 |
| Enterobacter cloacae | 1 | - |
| Enterobacter aerogenes | 1 | - |
| Klebsiella pneumoniae | 4 | 11 |
| Citrobacter freundii | 1 | - |
| Edwarsiella tarda | 3 | - |
| Hafnia alvei | 1 | - |
| Salmonella typhi | - | 1 |
| Streptococcaceae | ||
| Enterococcus spp. | 238 | 257 |
| Streptococcus viridans | 3 | 2 |
| Micrococcaceae | ||
| Staphylococcus spp. | 4 | 36 |
| Micrococcus spp. | 4 | - |
| Non-fermenters | ||
| Pseudomonas aeruginosa | 2 | 7 |
| Pseudomonas spp. | 9 | - |
| Acinetobacter spp. | 4 | - |
| Gram-negative non-fermenter bacteria | 44 | 58 |
| Total | 444 | 608 |