Cyanobacterial growth was visible on the inside walls of 40% of the urban tanks and 66.7% of the rural tanks (Table 1). In some cases, the presence of cyanobacterial growth could not be assessed due to an obstructed view, as is the case for groundwater wells, although the soil surrounding the well-pump was covered by active green cyanobacterial crusts. Chlorophyll a, used as a proxy for cyanobacterial growth, was observed in all water impoundments with the exception of one urban tank, and attained higher concentration ranges of 0.112–8.047 ng/ml in the urban environment than in the rural environments (0.119–0.991 ng/ml). Microscopic observation of the water sub-samples revealed the presence of known toxin producing Cyanobacteria of the order Chroococcales and the genus Microcoleus in 80% of the urban tanks and in 33% of the rural ones ( Cox et al., 2005 and Metcalf et al., 2015). The protozoan parasite Cryptosporidium known to cause recreational water illness (RWI) and food poisoning was found in one sub-sample of water in the rural setting ( Table 1 Supplementary Materials; Cantey et al., 2012). This water was primarily used for washing.