The coastline today is a complex, very diversified space, with profound changes and perpetual transformations. With a coastline of approximately 3500 km, developing on two Atlantic and Mediterranean maritime facades, the Moroccan coastline occupies a privileged place at the level of the entire coastline of the African continent. The wealth, associated with the strategic space that represents the littoral, made of this last one a major space of development of the country in terms of urbanization, industrial zones and tourist equipments. The quality of bathing water is a criterion increasingly demanded by the general public for the choice of its holiday resorts. The authorities watch over the Moroccan beaches and take all necessary measures to fight against their pollution. The direct and recognized consequence of this activity is the quality of the marine environment, which is the receptacle for all industrial, agricultural and urban nuisances. The Main objective of our present study is to make a diagnosis of the state of health of the principal beaches of our region of Rabat-Sale and Kenitra. Our sampling focused on 8 beaches of Kenitra Mehdia, Nations, Rabat-Sale, Harhoura, Témara, Golden Sand, Val D'or and finally the beach of Skhirate Amphitrite. Bacteriological analyzes were conducted to identify the microorganisms that are indicative of faecal pollution including faecal coliforms and faecal streptococci and their enumeration by the filter membrane method on nutrient media Tergitol7 Agar, Litsky, Slanetz & Bartley.