N2 - Chemical industries in Onitsha urban area of southeastern Nigeria have been discharging large quantities of effluents into surface streams. These streams are the primary sources of water used by poor households for domestic purposes. This study examines the effects of effluents on the physicochemical and microbiological characteristics of the recipient streams. This objective was achieved by collecting eight effluents and twenty-two water samples from control points, discharge lo-cations and exit chutes of the effluents for analysis. The results of the study characterised the effluents and their effects on the recipient streams. The effluents cause gross pollution of the streams as most of the parameters including pH, total dis-solved solids (TDS), turbidity, biological oxygen demand (BOD), chemical oxygen demand (COD), Mg, NO3, Fe, Cu, Pb, Cr, total heterotrophic count (THC) and total coliform group (TCG) returned high values that exceeded the World Health Organisation’s (WHO) benchmark from 2011 for drinking water quality. Only dissolved oxygen (DO), Na, Zn, Ca, and Na returned values lower than the WHO guideline. E. coli was found in all the samples; TCG was also high. This paper, there-fore, recommends that the effluent generating industries should treat their effluents before disposal. L1 - http://www.czasopisma.pan.pl/Content/113449/PDF-MASTER/Obeta%20Uche%20476.pdf L2 - http://www.czasopisma.pan.pl/Content/113449 PY - 2019 IS - No 42 EP - 142 KW - drinking water supplies KW - industrial effluents KW - streams contamination KW - water quality A1 - Obeta, Michael C. A1 - Okafor, Uchenna P. A1 - Nwankwo, Cletus F. PB - Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute DA - 2019.07.29 T1 - Influence of discharged industrial effluents on the parameters of surface water in Onitsha urban area, southeastern Nigeria SP - 136 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/113449 T2 - Journal of Water and Land Development