The authors classified the streptococci isolated from river water. Three hundred ninety strains of cocci were isolated from river water and classified. Of them, 362 strains (93%) proved to be enterococci derived from human and cattle feces. Only 28 strains, 7% of the isolates, were identified as S. faecalis subsp. liquefaciens which can be thought to be derived from insects. The results indicate that the classification of fecal streptococci is a reliable and useful indicator of water pollution.