The study determines the physico-chemical parameters of water from Odo-Ebo River with a view to providing information on the effects of discharge from carwash on the River’s water quality. Samples (48) for physico-chemical water quality were collected monthly over a period of an annual cycle (February 2015–January 2016) from four stations, namely: upstream (about 500 m before the carwash), two discharge points (1st and 2nd discharge points), and downstream (about 500 m after the carwash). The discharge points had higher mean values in 9 out of the 13 investigated water quality parameters, especially plant nutrient ions (phosphate, nitrate, and sulphate), with the discharge points significantly differing from the other stations in terms of phosphate concentration and apparent colour. This led to reduction in dissolved oxygen and zooplankton abundance, changes in apparent water colour, and increase in COD at the effluent receiving points. Furthermore, the higher mean values of dissolved oxygen, BOD5, turbidity, and true colour recorded upstream and downstream were reflections of higher biological productivity and organic detritus at these stations as compared to discharge points. The specific presence of some eutrophic species at the discharge points has only further proven the negative effects the effluent from the carwash had on the river, thus posing a potential threat to its aquatic organisms’ diversity. This eutrophication effect was observed downstream as an increase in zooplankton abundance and diversity. Therefore, environmental protection regulations are needed to reduce anthropogenic influence on the rivers in Nigeria.
If the inline PDF is not rendering correctly, you can download the PDF file here.
 Dudgeon D. Arthington A. H. Gessner M. O. Kawabata Z. Knowler D. J. Leveque C. Naiman R. J. Prieur-Richard A. Soto D. Stiassny M. L. J. Sullivan C. A. (2006) Freshwater biodiversity: Importance threats status and conservation challenges. Biological Reviews of Cambridge Philosophical Society (81) 163–182. doi: 10.1017/S146479310500695.
 Patil D. B. Tijare R. V. (2001) Investigation of pollution mystery of suspected carcinogen Cr (VI) and its control. Journal of Indian Pollution Control 17(1) 43–47.
 Singh R. P. Mathur P. (2005) Investigation of variations in physico-chemical characteristics of fresh water reservoir of Ajmer city Rajsthan. Indian Journal of Environmental Science (9) 57–61.
 Gupta S. Shukla D. N. (2006) Physicochemical analysis of sewage water and its effect on seed germination and seedling growth of Sesamum indicum. Journal of Natural Development 1 15–19.
 Igbozurike U. M. (1998) Water: The endangered spring of life. Keynote address at the 41st Annual Conference of the Nigerian Geographical Association University of Uyo Uyo Nigeria. 345–347.
 Simmons I. G. (1999) Earth air and water resources management in the late 20th century. London: Edward Arnold 8th ed.
 Adewoye S. O. (2010) Effects of detergent effluent discharges on the aspect of water quality of Asa River Ilorin Nigeria. Agriculture and Biology Journal of North America 1(4) 731–736.
 Odjegba V. J. Bamgbose N. M. (2012) Toxicity assessment of treated effluents from a textile industry in Lagos Nigeria. African Journal of Environmental Science and Technology 6(11) 438–445.
 Ankley G. T. Burkhard L. P. (1992) Identification of surfactants as toxicants in a primary effluent. Environmental Toxicology Chemistry (11) 1235–1248.
 Warne M. S. J. Schifko A. D. (1999) Toxicity of laundry detergent components to a freshwater cladoceran and their contribution to detergent toxicity. Ecotoxicology Environmental 44 196–206.
 Ogbulie T. E. Ogbulie J. N. Umezuruike I. (2008) Biodegradation of detergents by aquatic bacterial flora from Otamiri River Nigeria. African Journal of Biotechnology 7 824–830.
 Danha C. Utete B. Soropa G. Rufasha S. B. (2014) Potential impact of wash bay effluent on the water quality of a subtropical river. Journal of Water Resource and Protection 6 1045–1050. http://dx.doi.org/10.4236/jwarp.2014.611099.
 Anyinkeng N. Afui M. M Tening A. S Che C. A. (2016) Phytoplankton diversity and abundance in water bodies as affected by anthropogenic activities within the Buea municipality Cameroon. Journal of Ecology and the Natural Environment 8(7) 99–114.
 Orkide M. Meral O. Ozdemir E. Ersin M. (2009) Detergent and phosphate pollution in Gediz River Turkey. African Journal of Biotechnology 8(15) 3568–3575.
 Mackereth F. J. H. Heron J. Talling J. F. (1978) Water analysis: Some revised methods for limnologists. Freshwater Biological Association London. Scientific Publications 36.
 Golterman H. L. Clyno R. S. Ohnstad M. A. M. (1978) Methods for physical and chemical analysis of freshwaters. 2nd ed. Oxford: Blackwell.
 Ademoroti C. M. A. (1996) Standard methods for water and effluents analysis. Foludex Press Ltd.: Ibadan Nigeria 3 29–118.
 APHA (2000) Standard methods for the examination of water and waste water. (14th edition). American Public Health Association Washington. D.C. 776.
 Jeje C. Fernando C. H. (1985) A practical guide to the identification of Nigerian zooplankton. Kainji Lake Research Institute New Bussa.
 Fernando C. H. (2002) A guide to tropical freshwater zooplankton; identification ecology and impact on fisheries. Leiden The Netherlands: Backhuys Publishers. 235–254.
 Suthers I. M. Rissik D. (2009) Plankton: A guide to their ecology and monitoring for water quality. Australia: CSIRO Publishing.
 NESREA: National Environmental Standards and Regulations Enforcement Agency. (2011) National environmental (surface and ground water quality control) regulations – effluent discharges irrigation and reuse standards. (Accessed on: 17th February 2017).
 Aikins S. and Boakye D. O. (2015) Carwash wastewater characterization and effect on surface water quality: A case study of washing bays sited on Oda and Daban streams in Kumasi Ghana. ARPN Journal of Science and Technology 5(4): 190 – 197.
 Lodh R. P. Karmakar B. Das M. K. (2014) Physicochemical studies of water quality with special reference to ancient lakes of Udaipur city Tripura India. International Journal of Scientific and Research Publications 4(6) 234–345.
 Sablayrolles C. Vialle C. Vignoles C. Montrejaud-Vignoles M. (2010) Impact of car wash discharge on storm water quality (Toulouse France). Water Sci. Technol. 62 2737–2746. doi: 10.2166/wst.2010.929.
 Aisling O. Darren S. Joseph G. (2011) Quantifying the impact of car washing on water quality and assessing simple treatment strategies. Report No. R11/115. Report prepared for Environment Canterbury Regional Council Kaunihera Taiao Ki Waitaha. Published on Dec. 14th 2011. http://www.clenwaterways.org.nz/pdf/quantifying-impact-car.
 Adeyemi-ale O. A. Aladesida A. A. Esenowo I. K. (2014) The effect of detergent effluent on the physico-chemical characteristics and plankton diversity of Osere Stream Ilorin Kwara State Nigeria. Journal of Applied Science Environmental Management 18(1) 99–103.
 Fokmare A. K. Musaddique M. (2001) Comparative studies of physico-chemical and bacteriological quality of surface and ground water at Akole (MS). Pollution Research 4(1) 56–61.
 Oknich J. (2002) Handbook for the perceived environmental impact of car washing. Ramsey-Washington Metro Watershed District Washington.
 Waters S. (2011) Getting the storm water message across: Supporting information on the effects of selected residential activities on storm water quality (with particular reference to the aquatic ecosystems of the Avon River/Ōtākaro and Heathcote River/Ōpāwaho in Christchurch. Christchurch New Zealand.
 Attayde J. L. Bozelli R. L. (1998) Environmental heterogeneity patterns and predictive models of chlorophyll in a Brazilian coastal lagoon. Hydrobiologia 390 129–139.
 Adedeji A. A. Komolafe O. O. Akinrele O. A. Adeleke O. (2015) Water quality and plankton biota of Osinmo Reservoir Osun State South-West Nigeria. Zoology and Ecology 25(2) 145–153.
 Adeniyi I. F. Adedeji A. A. (2007) The Rotifera fauna of Gongola River Basin Northeast Nigeria. Ife Journal of Science 9(1) 1–16.