N2 - Lake Mellah close to the Mediterranean Sea in north-eastern Algeria belongs to valuable ornithological sites with nu-merous, often migratory, birds. To achieve the research goal, seventeen (17) sampling points were sampled based on the urbanization of the watershed. Water samples were taken at different wadis levels (upstream and downstream of settle-ments), as well as at the wastewater treatment plant and in Lake Mellah based on four measurement campaigns conducted at one frequency seasonal (high water, low water) during the year (2011/2012). Biological parameters (coliform faecal bac-teria, streptococci) were analysed in water of the lake and its affluents in the laboratory of the Department of Health and Population, El Taref by the most probable number (MPN) technique of the Mac Grady table taken from various points. Ob-tained results were processed by the use of Bourgeois ratio (coliform faecal bacteria: streptococci) to indicate the origin offaecal contamination of waters and to establish maps of the spatio-temporal evolution of this ratio by the software Surfer 9. This way we obtained information of contamination of human origin during the dry season coming from domestic waste waters. In winter the ratio showed animal prevalence of contamination coming primarily from Animal Park in El Kala. L1 - http://journals.pan.pl/Content/113446/PDF-MASTER/Kherifi%20et%20al%20367.pdf L2 - http://journals.pan.pl/Content/113446 PY - 2019 IS - No 42 EP - 116 KW - affluents KW - biological parameters KW - Bourgeois ratio KW - faecal contamination KW - the Lake Mellah KW - waste waters A1 - Kherifi, Wahida A1 - Hecini, Lynda A1 - Bekiri, Fedia A1 - Kherici-Bousnoubra, Houria PB - Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute DA - 2019.07.29 T1 - Faecal contamination of water in the Lake Mellah and its catchment area, north-eastern Algeria SP - 110 UR - http://journals.pan.pl/dlibra/publication/edition/113446 T2 - Journal of Water and Land Development