Most of the enterococcus species occupy humans and other animals’ intestinal flora. The genus Enterococcuscombines more than 17 species out of which few cause clinical infections in humans. The treatment of these nosocomial pathogens is often found to be challenging. This diverse group of bacteria includes also species that inhibit habitats outside the living organism. Therefore, their presence in water does not necessarily indicates a faecal contamination. Despite it is less sensitive than thermotolerant coliforms, the specificity of this indicator is still acceptable. Enteroccocus is outnumbered by E.coli in the faeces however it’s longer life span may be used as an indicator of aged faecal contamination or as an indicator of specific pathogens that survive for longer periods, such as viruses.