There were 86 water samples from open drains tested for E. coli and 42 for coliphage. The concentrations of coliphage in the open drain water samples were consistently lower than the E. coli concentrations across all drain types (Table 6). Water samples from drains that were originally rivers/lagoons had E. coli concentrations that were significantly lower than water samples that were taken from drains that only functioned as drains (geometric mean, 7.93 cfu log₁₀/100 mL vs. 8.72 cfu log₁₀/100 mL; P < 0.01). There was no significant difference in coliphage concentrations between drains that were originally rivers/lagoons and those that were not. To assess differences in microbial concentrations between other neighborhood and drain characteristics, samples from drains that were originally rivers/lagoons were removed from the analysis. For remaining samples, E. coli and coliphage concentrations in drain water samples did not significantly differ by neighborhood, drain size, construction type, or cover (Table 6).