The evaluation of the suitability of N’Zi River water (Côte d’Ivoire) for biological functions, potable use, and livestock watering across the N’ZI watershed provided an integrated basis for evaluating the river’s overall water quality. The objective of this study was to determine the river’s fitness for biological processes and potable water use. To this end, sampling was conducted at five sites with a total of 20 samples collected during the dry season and the rainy season. The characterization of water quality was evaluated based on ten (10) alterations. These include organic and oxidizable matter, nitrogenous matter excluding nitrates, nitrates, phosphorous matter, suspended particles, acidification, temperature, mineralization, color, and mineral micropollutants in raw water. Following the determination of the mean concentrations for the measured parameters, the quality indices of the ten (10) alterations were computed using a framework derived from the Water Quality Index (WQI) concept. This procedure enables the application of the SEQ-Water method to evaluate the suitability of N’ZI River water. The results reveal that water temperature and electrical conductivity reflect a low mineralization of N’ZI River water, corroborated by the observed dissolved oxygen concentrations. In contrast, turbidity and suspended solids (SS) exhibit considerable spatial and temporal variability. Nutrient concentrations including nitrate, nitrite, phosphate, and ammonium remain consistently low relative to international water quality standards, indicating limited anthropogenic nutrient input. The organic composition shows significant variation related to anthropogenic activities. As for heavy metals, they exceed the standard. The metals are of poor to very poor quality. The waters are of good to very good quality regarding nitrogenous matter excluding nitrate, nitrates, mineralization, and mineral micropollutants at all sample collection sites. The classification according to the alteration indicates that the waters of the N’ZI river are generally of good to moderate quality for its suitability for biology, for drinking water use, and very conducive to watering.
| Published in | Journal of Water Resources and Ocean Science (Volume 14, Issue 6) |
| DOI | 10.11648/j.wros.20251406.15 |
| Page(s) | 214-228 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2025. Published by Science Publishing Group |
Water Suitability for Biology, Drinking Water Use, Physicochemical Quality, SEQ-Eau Method, N'ZI River, Côte-d’Ivoire
| [1] | Kherief-Nacereddine, S., Djeddi, H., Yasmine, B. N., BOUKERIA, S., BENMAKHLOUF, Z., & Mehennaou-Afri, F. Z. (2023). The variability influence of physicochemical parameters on macroinvertebrate assemblages in the Rhumel and Endja rivers, Algeria. Biodiversitas Journal of Biological Diversity, 24(1). |
| [2] | Abellán, Javier; Alonso, José Antonio (2022). “Promouvoir l’accès mondial à l’eau et à l’assainissement: Une perspective d’offre et de demande”. Ressources en eau et économie. 38: 100194. |
| [3] | Nations Unies (2018). Objectif de développement durable. 6, Rapport de synthèse 2018 sur l’eau et l’assainissement. Nations Unies, New York. ISBN 9789211013702. OCLC 1107804829. |
| [4] | Keddari D, Smatti-Hamza I, Mehennaoui S, Sahli L, Afri-Mehennaoui FZ. 2021. Occurrence and distribution of heavy metals in the tissues of Physa acuta (D.) in relation to the contamination level of sedimentsfrom Boumerzoug wadi (Algeria). Environ Forensics 1-16. |
| [5] | Yao K. L, Kouakou K. E., Kouakou A. B. P., Yapo N. S., Kouassi A. M. (2025). Assessment of the Water Pollution Level of the N'ZI River (Côte d'Ivoire). Journal of Water Resources and Ocean Science, 14(1), 18-34. |
| [6] | Yao, K. L., Kouakou, K. E., Kouassi, A. M., Deguy, A. J.-P, & Camara, M. (2023). Analysis of land use change in the N'ZI watershed of Côte d'Ivoire using Landsat satellite images. Earth and Space Science, 10, e2022EA002744. |
| [7] | Kouassi, J.-L., 2019. Variabilité climatique, dynamique des feux de végétation et perceptions locales dans le bassin versant du N’Zi (Centre de la Côte d’Ivoire) (phdthesis). Institut National Polytechnique Felix Houphoët Boigny - Yamoussoukro. 250p. |
| [8] | Thomas T. Maillard. (2019). La ressource en eau dans la région de Gbêkê (Côte d’Ivoire). [Rapport de recherche] Région Normandie. ffhalshs-02277088f. |
| [9] | Yao, K. L, Y.., Kouakou, K. E, Kouassi, A. M, & Asaph, G. (2022). [Analysis of the risks of rainfall aggressiveness on the soils of the N’ZI watershed (Côte d’Ivoire)]. International Journal of Innovation and Applied Studies, 38(2), 454-469. |
| [10] | Blé, L. O., Kouassi, A. E., Adro, J. E., & Degny, S. (2022). Etat de pollution des eaux de la rivière Kan, après la crise militaro-politique de 2010 en Côte d’Ivoire. International Journal of Biological and Chemical Sciences, 16(2), 878-890. |
| [11] | KOUAKOU, A. B. P., KAMAGATE, B., & LAWIN, A. E. (2018). Spatial and temporal variation of traces elements in surface water in the Agneby watershed (Côte d’Ivoire, West Africa). Environmental and Water Sciences, public Health and Territorial Intelligence Journal, 2(3), 73-86. |
| [12] | Koffi, Y. B., Ahoussi, K. E., Kouassi, A. M., & Biemi, J. (2014). Ressources minières, pétrolières et gazières de la Côte d’Ivoire et problématique de la pollution des ressources en eau et des inondations. Geo-Eco-Trop, 38(1), 119-136. |
| [13] | Beck, M., Billoir, E., Floury, M., Usseglio-Polatera, P., & Danger, M. (2023). A 34-year survey under phosphorus decline and warming: Consequences on stoichiometry and functional trait composition of freshwater macroinvertebrate communities. Science of The Total Environment, 858, 159786. |
| [14] | David, P. Y., Pennequin, D., Charlier, J. B., Ladouche, B., Meire, B., Feeny-Fereol, V.,... & Sanson, G. (2023). Middle Risle River Critical Zone Observatory: monitoring karst-process evolution and its impact on surface water and on aquatic ecosystems. Geological Society, London, Special Publications, 517(1), SP517-2020. |
| [15] | Stevens, A. L., Siaka, B., & Naminata, K. (2022). Qualité des eaux de petits barrages du nord et centre de la Côte d'Ivoire à partir des macroinvertébrés aquatiques. International Journal of Innovation and Applied Studies, 35(4), 523-533. |
| [16] | Idrissi N., Elmadani F. Z., Rais Z., Taleb M., (2018). Assessment of the physicochemical and bacteriological quality of Oued Fez and Sebou River downstream of Fez after the launch of the wastewater treatment plant, and its impacts on health, Morocco. J. Mater. Environ, Sci., 9(S1): 213-227. |
| [17] | Mimouni Yassine, 2020. Evaluations de la qualité physico-chimique et bactériologique des eaux de surface de trois sous bassins de Tensift. ULiège - Faculté des Sciences, Mémoire de master. P79. URI/URL: |
| [18] | El Hmaidi, A., Talhaoui, A., Manssouri, I., Jaddi, H., Ben-Daoud, M., Kasse, Z.,... & Essahlaoui, A. (2022). Assessment of the physicochemical water quality of the Moulouya River, Morocco, using the SEQ-Eau index. Environmental Monitoring and Assessment, 194, 1-17. |
| [19] | Kaczmarek, N., Mahjoubi, I., Benlasri, M., Nothof, M., Schäfer, R. B., Frör, O., & Berger, E. (2023). Water quality, biological quality, and human well-being: Water salinity and scarcity in the Draa River basin, Morocco. Ecological Indicators, 148, 110050. |
| [20] | Leenhardt, D., Voltz, M., & Barreteau, O. (2020). L'eau en milieu agricole: Outils et méthodes pour une gestion intégrée et territoriale (p. 288). éditions Quae. |
| [21] | Merbouh, C., Namoussi, S., Kabriti, M., Naamane, A., Rihane, A., Iounes, N., 2022. Physico-Chemical Characterization of an Urban Wastewater Effluent and its Impact on the Receiving Environment: Oued Nfifikh (Morocco). Journal of Ecological Engineering 23. (3), 183-193. |
| [22] | Lebe Prisca Marie-Sandrine Kouakou, Amadou Kouyate, Ali Sanou, Aka Eric Koffi, Mougo Andre Tigori, et al. (2022). Evaluation of the Physico-chemical Quality of Drinking Water in the City of Daloa (Mid-West of Côte d'Ivoire) - Effects on Human Health. Journal of Health and Environmental Research, 8(3), 186-196. |
| [23] | Diagne, I., Ndiaye, M., Ndiaye, B., Dione, C. T., Cisse, D., Hane, M., Diop, A., 2017. Répartition des paramètres physico-chimiques et métalliques des eaux usées de Hann (Dakar) avec le milieu marin. International journal of biological and chemical sciences 11, 3100-3109. |
| [24] | Mangoua-Allali, A. L. C., Kouame, N. D. A. C., & Coulibaly, L. (2021). Évaluation de la qualité physico-chimique et bactériologique des eaux de puits et du marigot de la ville de Bocanda, Côte d’Ivoire. Afrique Science, 19(3), 16-27. |
| [25] | Amesitor, K. G., Tchakala, I., Boguido, G., Kodom, T., & Bawa, L. M. (2025). Évaluation de la qualité physico-chimique des eaux de consommation dans les villes galopantes: cas de la ville de Tsévié, Togo. Journal de la Société Ouest-Africaine de Chimie, 54, 10-24. |
| [26] | MEDD, 2003. System for evaluating the water quality of rivers (SEQ-Eau), version 2 - Inter-Agency Study No. 52 carried out by the Ministry of Ecology and Sustainable Development (MEDD) and the Water Agencies (AE).106p. |
| [27] | Argillier, C., Chauvin, C., Lepage, M., Logez, M., Souchon, Y., Villeneuve, B., 2020. 20 ans de recherche pour le développement des méthodes hydroécologiques en appui à la directive-cadre européenne sur l’eau. 126pp. |
| [28] | Rabiet, M., Rouwane, A., Bourven, I., Grybos, M., Boyard, C., & Guibaud, G. (2017). Pollution diffuse en tête de bassin versant: quelle méthodologie mettre en place pour un meilleur diagnostic des zones de contribution. Techniques Sciences Méthodes, (4), 42-52. |
| [29] | N’Goran, K. M., Soro, M. P., Kouassi, N. G. L. B., Trokourey, A., & Yao, K. M. (2023). Distribution, Speciation and Bioavailability of Nutrients in M’Badon Bay of Ebrie Lagoon, West Africa (Côte d’Ivoire). Chemistry Africa, 1-14. |
| [30] | Melle Epounde, A. C., FotoMenbohan, S., Nwaha, M., Moanono, P., Biram, A. N. E., & Mbohou, Z. (2023). Water Quality of a Lowland and An Urban Stream by Analyzing the Structure of the Benthic Macroinvertebrates Population. METHODS, 6(1). |
| [31] | Agences de l’Eau (2003). Système d’évaluation de la qualité de l’eau des cours d’eau: grilles d’évaluation. Version 2 du Seq-Eau, Agences de l’Eau, 40 p. |
| [32] | Berezowska-Azzag, E., Abdelatif, I., Akrour, N., Bouallag-Azoui, O., Srir, M., 2014. La recherche d’intercommunalité par l’évaluation des performances environnementales locales à Alger. Méditerranée. Revue géographique des pays méditerranéens/Journal of Mediterranean geography 31-47. |
| [33] | Errochdi, S., El Alami, M., Bennas, N., Belqat, B., Ater, M., Fdil, F., 2012. Étude de la qualité physicochimique et microbiologique de deux réseaux hydrographiques nord marocains: Laou et Tahaddart. Méditerranée. Revue géographique des pays méditerranéens/Journal of Mediterranean geography 41-51. |
| [34] | Uddin, M. G., Nash, S., Olbert, A. I., 2021. A review of water quality index models and their use for assessing surface water quality. Ecological Indicators 122, 107218. |
| [35] | Berthon, V., Bouchez, A., & Rimet, F. (2011). Using diatom life-forms and ecological guilds to assess organic pollution and trophic level in rivers: a case study of rivers in south-eastern France. Hydrobiologia, 673(1), 259-271. |
| [36] | Gboko, A. J., Akobe, A. C., Aka, A. M., Aka, C. A., Kouame, A. F., Adou, K. N.,... & Aka, K. (2019). Etat d’eutrophisation de la lagune continentale Ono (Bonoua sud-est de la Côte d’Ivoire) dans un environnement agro-industriel durant la crue du fleuve Comoé. International Journal of Biological and Chemical Sciences, 13(6), 2942-2958. |
| [37] | Golcher Benavides, C., 2018. Qualité des eaux d’une rivière urbaine: Suivi réglementaire versus Perception des riverains Le cas du río Liberia (Costa Rica) (PhD Thesis). Paris, AgroParisTech. |
| [38] | Kouakou, L. P. M. S., Kouyate, A., Sanou, A., Tigori, M. A., Meite, N., Bohoussou, K. J. P., & Dibi, B. (2022). Evaluation of the Physico-chemical Quality of Drinking Water in the City of Daloa (Mid-West of Côte d'Ivoire)-Effects on Human Health. Journal of Health and Environmental Research, 8(3), 186-196. |
| [39] | Faouzi, J., Bedoui, I., Rezouki, S., Moubchir, T., Allali, A., Eloutassl, N., & Lahkimi, A. (2023). Vertical transfer of bacteriological and parasitological pollutants from irrigation water to soil and crops. Ecological Engineering & Environmental Technology, 24(1), 93-103. |
| [40] | Odjohou, E., Amani, M., Soro, G., & Monde, S. (2020). Caractérisation physico-chimique des eaux d’un système lacustre du cordon littoral ivoirien: cas du lac Labion. International Journal of Biological and Chemical Sciences, 14(5), 1878-1892. |
| [41] | Abdel-Satar, A. M., Ali, M. H., & Goher, M. E. (2017). Indices of water quality and metal pollution of Nile River, Egypt. The Egyptian Journal of Aquatic Research, 43(1), 21-29. |
| [42] |
WHO (World Health Organization). (2017). Guidelines for drinking-water quality: fourth edition incorporating the first addendum. 631p.
https://www.who.int/publications-detail-redirect/9789241549950 |
| [43] | Sidik, D. A., Issa, B., Carole, G. V., Eric, Y. K., Julien, C. K., Sabine, V.,... & Joseph, D. A. (2023). Assessment of Bacterial Load in Urban Wastewater in Drainage Canals in the Cities of Abidjan, Bouake and Yamousoukro, Côte d'Ivoire. South Asian Journal of Research in Microbiology, 15(2), 1-11. |
| [44] | Kouassi, A. M., Mamadou, A., Ahoussi, K. E., Biemi, J., 2013. Simulation de la conductivité électrique des eaux souterraines en relation avec leurs propriétés géologiques: cas de la Côte d’Ivoire. Revue Ivoirienne des Sciences et Technologie 21, 138-166. |
| [45] | Tohouri, P., ADJA, M. G., Gabriel Etienne, A. K. E., & SORO, G. (2016). Hydrochimie des eaux de surface en saison pluvieuse de la région de Bonoua, Sud-Est de la Côte d’Ivoire. Afrique SCIENCE, 12(6), 151-167. |
APA Style
Eugène, K. K., Léon, Y. K., Rachel, K. A., Michel, K. A. (2025). Assessment of the Suitability of the N’ZI River Water (Côte d'Ivoire) for Biological and Drinking Water Use. Journal of Water Resources and Ocean Science, 14(6), 214-228. https://doi.org/10.11648/j.wros.20251406.15
ACS Style
Eugène, K. K.; Léon, Y. K.; Rachel, K. A.; Michel, K. A. Assessment of the Suitability of the N’ZI River Water (Côte d'Ivoire) for Biological and Drinking Water Use. J. Water Resour. Ocean Sci. 2025, 14(6), 214-228. doi: 10.11648/j.wros.20251406.15
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Download@article{10.11648/j.wros.20251406.15,
author = {Kouakou Koffi Eugène and Yao Koffi Léon and Kouassi Affoué Rachel and Kouassi Amani Michel},
title = {Assessment of the Suitability of the N’ZI River Water (Côte d'Ivoire) for Biological and Drinking Water Use},
journal = {Journal of Water Resources and Ocean Science},
volume = {14},
number = {6},
pages = {214-228},
doi = {10.11648/j.wros.20251406.15},
url = {https://doi.org/10.11648/j.wros.20251406.15},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.wros.20251406.15},
abstract = {The evaluation of the suitability of N’Zi River water (Côte d’Ivoire) for biological functions, potable use, and livestock watering across the N’ZI watershed provided an integrated basis for evaluating the river’s overall water quality. The objective of this study was to determine the river’s fitness for biological processes and potable water use. To this end, sampling was conducted at five sites with a total of 20 samples collected during the dry season and the rainy season. The characterization of water quality was evaluated based on ten (10) alterations. These include organic and oxidizable matter, nitrogenous matter excluding nitrates, nitrates, phosphorous matter, suspended particles, acidification, temperature, mineralization, color, and mineral micropollutants in raw water. Following the determination of the mean concentrations for the measured parameters, the quality indices of the ten (10) alterations were computed using a framework derived from the Water Quality Index (WQI) concept. This procedure enables the application of the SEQ-Water method to evaluate the suitability of N’ZI River water. The results reveal that water temperature and electrical conductivity reflect a low mineralization of N’ZI River water, corroborated by the observed dissolved oxygen concentrations. In contrast, turbidity and suspended solids (SS) exhibit considerable spatial and temporal variability. Nutrient concentrations including nitrate, nitrite, phosphate, and ammonium remain consistently low relative to international water quality standards, indicating limited anthropogenic nutrient input. The organic composition shows significant variation related to anthropogenic activities. As for heavy metals, they exceed the standard. The metals are of poor to very poor quality. The waters are of good to very good quality regarding nitrogenous matter excluding nitrate, nitrates, mineralization, and mineral micropollutants at all sample collection sites. The classification according to the alteration indicates that the waters of the N’ZI river are generally of good to moderate quality for its suitability for biology, for drinking water use, and very conducive to watering.},
year = {2025}
}
TY - JOUR T1 - Assessment of the Suitability of the N’ZI River Water (Côte d'Ivoire) for Biological and Drinking Water Use AU - Kouakou Koffi Eugène AU - Yao Koffi Léon AU - Kouassi Affoué Rachel AU - Kouassi Amani Michel Y1 - 2025/12/30 PY - 2025 N1 - https://doi.org/10.11648/j.wros.20251406.15 DO - 10.11648/j.wros.20251406.15 T2 - Journal of Water Resources and Ocean Science JF - Journal of Water Resources and Ocean Science JO - Journal of Water Resources and Ocean Science SP - 214 EP - 228 PB - Science Publishing Group SN - 2328-7993 UR - https://doi.org/10.11648/j.wros.20251406.15 AB - The evaluation of the suitability of N’Zi River water (Côte d’Ivoire) for biological functions, potable use, and livestock watering across the N’ZI watershed provided an integrated basis for evaluating the river’s overall water quality. The objective of this study was to determine the river’s fitness for biological processes and potable water use. To this end, sampling was conducted at five sites with a total of 20 samples collected during the dry season and the rainy season. The characterization of water quality was evaluated based on ten (10) alterations. These include organic and oxidizable matter, nitrogenous matter excluding nitrates, nitrates, phosphorous matter, suspended particles, acidification, temperature, mineralization, color, and mineral micropollutants in raw water. Following the determination of the mean concentrations for the measured parameters, the quality indices of the ten (10) alterations were computed using a framework derived from the Water Quality Index (WQI) concept. This procedure enables the application of the SEQ-Water method to evaluate the suitability of N’ZI River water. The results reveal that water temperature and electrical conductivity reflect a low mineralization of N’ZI River water, corroborated by the observed dissolved oxygen concentrations. In contrast, turbidity and suspended solids (SS) exhibit considerable spatial and temporal variability. Nutrient concentrations including nitrate, nitrite, phosphate, and ammonium remain consistently low relative to international water quality standards, indicating limited anthropogenic nutrient input. The organic composition shows significant variation related to anthropogenic activities. As for heavy metals, they exceed the standard. The metals are of poor to very poor quality. The waters are of good to very good quality regarding nitrogenous matter excluding nitrate, nitrates, mineralization, and mineral micropollutants at all sample collection sites. The classification according to the alteration indicates that the waters of the N’ZI river are generally of good to moderate quality for its suitability for biology, for drinking water use, and very conducive to watering. VL - 14 IS - 6 ER -
Department of Earth Sciences and Mining Resources, Institut National Polytechnique Félix Houphouët-Boigny (INP-HB), Yamoussoukro, Côte d’Ivoire;Laboratory of Geographic Sciences, Civil Engineering and Geosciences, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro, Côte d’Ivoire
Department of Earth Sciences and Mining Resources, Institut National Polytechnique Félix Houphouët-Boigny (INP-HB), Yamoussoukro, Côte d’Ivoire;Department of Physical Geography, Climate, Water, and Sustainable Development in Tropical Environments, Allassane Ouattara University (UAO), Bouaké, Côte d’Ivoire;Laboratory of Geographic Sciences, Civil Engineering and Geosciences, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro, Côte d’Ivoire
Department of Earth Sciences and Mining Resources, Institut National Polytechnique Félix Houphouët-Boigny (INP-HB), Yamoussoukro, Côte d’Ivoire;Laboratory of Geographic Sciences, Civil Engineering and Geosciences, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro, Côte d’Ivoire
Department of Earth Sciences and Mining Resources, Institut National Polytechnique Félix Houphouët-Boigny (INP-HB), Yamoussoukro, Côte d’Ivoire;Laboratory of Geographic Sciences, Civil Engineering and Geosciences, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro, Côte d’Ivoire
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