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Bulk tank milk from 131 dairy herds in eastern South Dakota and western Minnesota were examined for coliforms and noncoliform bacteria. Coliforms were detected in 62.3% of bulk tank milk samples. Counts ranged from 0 to 4.7 log₁₀ cfu/ml. The mean count was 3.4 log₁₀ cfu/ml. Gram-negative noncoliform bacteria were observed in 76.3% of bulk tank milk. Counts ranged from 0 to 6.2 log₁₀ cfu/ml. The mean count was 4.8 log₁₀ cfu/ml. A total of 234 isolates from bulk tank milk were examined to species level; 205 isolates belonged to 28 species. Coliforms and gram-negative noncoliform bacteria accounted for 32.9 and 67.1% of the total isolates, respectively. Organisms such as Agrobacterium radiobacter, Bordetella spp., Comamonas testosteroni, Listonella damsela, Ochrobactrum anthropi, and Oligella urethralis were isolated from bulk tank milk in this study. These organisms have not been reported previously …