Assessment of groundwater quality in Borana Zone, Ethiopia: A multidimensional analysis using groundwater pollution index, nitrate pollution index, and water quality index

Abstract

This study assessed groundwater quality in Yabelo, Elewaye, Gomole, and Duduluk towns in Ethiopia, analyzing 60 samples across 19 physicochemical parameters. The groundwater pollution index (GPI), nitrate pollution index (NPI), and water quality index (WQI) were used to evaluate drinking water suitability. Results showed turbidity, pH, bicarbonate, nitrite, and copper levels were within the World Health Organization recommended limits. However, 20% of the samples had high total dissolved solids and sulfate levels. Total hardness exceeded limits in 60% of the samples, and 40% had elevated nitrate concentrations. Chromium and fluoride were elevated by 10%, while total iron and manganese exceeded standards by 20%. The GPI indicated “Insignificant pollution” in 80% of samples and “Low pollution” in 20%. Among the samples, the NPI classified 50% as “Clean”, 10% as “Low pollution”, 30% as “Moderate”, and 10% as “Very high pollution”. The WQI rated 20% as “Good”, 30% as “Very good”, and 50% as “Excellent”. This study provides valuable insights to help authorities in identifying protective measures and treatment methods for water resources.

Keywords

Borana Zone / Drinking water / Ethiopia / Groundwater / Groundwater pollution index / Nitrate pollution index / Physicochemical parameter / Water quality index

Funding

None.

Conflict of interest

The authors declare that they have no conflicts of interest.

References

[1] Kenea D, Denekew T, Bulti R, et al. Investigation on surface water treatment using blended Moringa oleifera seed and Aloe vera plants as natural coagulants. S Afr J Chem Eng. 2023; 45(1):294-230. doi: 10.1016/j.sajce.2023.06.005

[2] Pham NQ, Nguyen GT. Evaluating groundwater quality using multivariate statistical analysis and groundwater quality index. Civil Eng J. 2024; 10(3):699-713. doi: 10.28991/CEJ-2024-010-03-03

[3] Elssaidi MA, Aishah RM, Panhwar QA. Water quality indices for the evaluation of the groundwater quality in Southwestern Libya. Water Pract Technol. 2024; 19(7):2827-2838. doi: 10.2166/wpt.2024.163

[4] Gudeta B, Ratnam MV, Mohan R. Physiochemical analysis of drinking water and treatment with a homemade filter: A case study of Illu Abba Bor Zone, Ethiopia. Int J Anal Chem. 2022; 2022(1): 4333938. doi: 10.1155/2022/4333938

[5] Gebresilasie KG, Berhe GG, Tesfay AH, Gebre SE. Assessment of Some physicochemical parameters and heavy metals in hand-dug well water samples of Kafta Humera Woreda, Tigray, Ethiopia. Int J Anal Chem. 2021; 2021(1): 8867507. doi: 10.1155/2021/8867507

[6] Babuji P, Thirumalaisamy S, Duraisamy K, Periyasamy G. Human health risks due to exposure to water pollution: A review. Water. 2023; 15(14):2532. doi: 10.3390/w15142532

[7] Abdulsalam H, Nuhu I, Lawal Y. Physicochemical and heavy metals assessment of some selected borehole water in Dutse town of Jigawa state. Fudma J Sci. 2019; 3(4):212-223.

[8] Adesakin TA, Oyewale AT, Bayero U, et al. Assessment of bacteriological quality and physico-chemical parameters of domestic water sources in Samaru community, Zaria, Northwest Nigeria. Heliyon. 2020; 6(8):e04773. doi: 10.1016/j.heliyon.2020.e04773

[9] Gizachew M, Admasie A, Wegi C, Assefa E. Bacteriological contamination of drinking water supply from protected water sources to point of use and water handling practices among beneficiary households of Boloso Sore Woreda, Wolaita zone, Ethiopia. Int J Microbiol. 2020; 2020(1): 5340202. doi: 10.1155/2020/5340202

[10] Akinola OT, Onyeaghasiri FU, Oluranti OO, Elutade OO. Assessment of well water as a reservoir for extended-spectrum β-lactamases (ESBL) and carbapenem resistant Enterobacteriaceae from Iwo, Osun state, Nigeria. Iran J Microbiol. 2022; 14(3):351-361. doi: 10.18502/ijm.v14i3.9772

[11] Siraj KT, Rao P. Review on current world water resources scenario and water treatment technologies and techniques. Int J Appl Res. 2016; 2(4):262-266.

[12] Berhe BA. Evaluation of groundwater and surface water quality suitability for drinking and agricultural purposes in Kombolcha town area, Eastern Amhara region, Ethiopia. Appl Water Sci. 2020; 10(6):127. doi: 10.1007/s13201-020-01210-6

[13] Sanad H, Mouhir L, Zouahri A, et al. Assessment of groundwater quality using the Pollution Index of Groundwater (PIG), Nitrate Pollution Index (NPI), Water Quality Index (WQI), Multivariate Statistical Analysis (MSA), and GIS approaches: A case study of the Mnasra Region, Gharb Plain, Morocco. Water. 2024; 16(9):1263. doi: 10.3390/w16091263

[14] Affiah UE, Inim IJ, Tijani MN, Ituen AO. Groundwater quality assessment for drinking water using Water Quality Index (WQI): A case study of Eastern Obolo, Southeastern Nigeria. J Environ Earth Sci. 2018; 8(6):12-17.

[15] Akter T, Jhohura FT, Akter F, et al. Water quality index for measuring drinking water quality in rural Bangladesh: A cross-sectional study. J Health Popul Nutr. 2016; 35:4. doi: 10.1186/s41043-016-0041-5

[16] Adamou H, Ibrahim B, Salack S, Adamou R, Sanfo S, Liersch S. Physico-chemical and bacteriological quality of groundwater in a rural area of Western Niger: A case study of Bonkoukou. J Water Health. 2020; 18(1):77-90. doi: 10.2166/wh.2020.082

[17] Rao NS. Hydrogeology: Problems with Solutions. New Delhi: PHI Learning Pvt. Ltd.; 2016.

[18] Al-Aizari HS, Aslaou F, Al-Aizari AR, Al-Odayni AB, Al-Aizari AJM. Evaluation of groundwater quality and contamination using the Groundwater Pollution Index (GPI), Nitrate Pollution Index (NPI), and GIS. Water. 2023; 15(20):3701. doi: 10.3390/w15203701

[19] Panneerselvam B, Karuppannan S, Muniraj K. Evaluation of drinking and irrigation suitability of groundwater with special emphasizing the health risk posed by nitrate contamination using Nitrate Pollution Index (NPI) and Human Health Risk Assessment (HHRA). Hum Ecol Risk Assess Int J. 2020; 27(5):1324-1348. doi: 10.1080/10807039.2020.1833300

[20] Tofu DA, Fana C, Dilbato T, Dirbaba NB, Tesso G. Pastoralists’ and agro-pastoralists’ livelihood resilience to climate change-induced risks in the Borana zone, south Ethiopia: Using resilience index measurement approach. Pastoralism. 2023; 13(1):1-14. doi: 10.1186/s13570-022-00263-3

[21] Worku MA, Feyisa GL, Beketie KT, Garbolino E. Rainfall variability and trends in the Borana zone of Southern Ethiopia. J Water Clim Change. 2022; 13(8):3132-3151. doi: 10.2166/wcc.2022.173

[22] Lasage R, Seifu A, Hoogland M, De Vries A. Report on General Characteristics of the Borana Zone, Ethiopia. (IVM Report; No.R-10/03). Instituut Voor Milieuvraagstukken; 2010.

[23] Tadele D, Lelisa A. Assessment of water resources management and past works on water points development in Borana Rangelands, Southern Oromia, Ethiopia. Int J Water Resour Environ Eng. 2019; 11(2):39-44. doi: 10.5897/IJWREE2018.0806

[24] Gintamo B, Khan MA, Gulilat H, Shukla RK, Mekonnen Z. Determination of the physicochemical quality of groundwater and its potential health risk for drinking in Oromia, Ethiopia. Environ Health Insights. 2022;16. doi: 10.1177/11786302221096051

[25] Garoma B, Kenasa G, Jida M. Drinking water quality test of Shambu town (Ethiopia) from source to household taps using some physico-chemical and biological parameters. Res Rev J Ecol Environ Sci. 2018; 6(4):82-88.

[26] Mora A, Mahlknecht J, Rosales-Lagarde L, Hernández- Antonio A. Assessment of major ions and trace elements in groundwater supplied to the Monterrey metropolitan area, Nuevo León, Mexico. Environ Monit Assess. 2017; 189:394. doi: 10.1007/s10661-017-6096-y

[27] Kassegne AB, Leta S. Assessment of physicochemical and bacteriological water quality of drinking water in Ankober district, Amhara region, Ethiopia. Cogent Environ Sci. 2020; 6(1):1791461. doi: 10.1080/23311843.2020.1791461

[28] Maharjan S, Joshi TP, Koju R, Shrestha SM. Physicochemical and bacteriological analysis of groundwater quality of Kathmandu valley. J Nat Hist Mus. 2020; 31(1):123-134. doi: 10.3126/jnhm.v31i1.39381

[29] Fereja WM, Tagesse W, Benti G. Treatment of coffee processing wastewater using Moringa stenopetala seed powder: Removal of turbidity and chemical oxygen demand. Cogent Food Agric. 2020; 6(1):1816420. doi: 10.1080/23311932.2020.1816420

[30] APHA. Standard Methods for the Examination of Water and Wastewater. Washington, DC: American Public Health Association; 1999.

[31] Nigussie Z, Habtu NG. Performance evaluation of biocoagulant for the effective removal of turbidity and microbial pathogens from drinking water. J Water Health. 2023; 21(9):1158-1176. doi: 10.2166/wh.2023.059

[32] Ha QK, Van Le Thi M, Le Vo P, Nguyen HQ, Mukherjee A. An assessment of groundwater quality for drinking and agricultural purposes in Ca Mau Peninsula, Vietnamese Mekong Delta. IOP Conf Ser Earth Environ Sci. 2022; 964:012008. doi: 10.1088/1755-1315/964/1/012008

[33] World Health Organization. Guidelines for Drinking-water Quality, in WHO Chronicle. 4th ed. Geneva, Switzerland: World Health Organization; 2011. p. 104-108.

[34] World Health Organization. Guidelines for Drinking-water Quality: First Addendum to the Fourth Edition. Geneva, Switzerland: World Health Organization; 2017.

[35] Godwin A, Oborakpororo O. Well water quality assessment using water quality index in Warri Metropolis, Delta State, Nigeria. Int J Environ Pollut Res. 2019; 7(3):45-52. doi: 10.37745/ijepr.13

[36] Ethiopia Socioeconomic Survey. Drinking from the Water Quality in Ethiopia: Results 2016. Ethiopia Socioeconomic Survey; 2017.

[37] World Health Organization. Total Dissolved Solids in Drinking-water: Background Document for Development of WHO Guidelines for Drinking-water Quality. (Publ. No. WSH/03.04/16). Geneva, Switzerland: World Health Organization; 2003.

[38] Sarath Prasanth SV, Magesh NS, Jitheshlal KV, Chandrasekar N, Gangadhar K. Evaluation of groundwater quality and its suitability for drinking and agricultural use in the coastal stretch of Alappuzha District, Kerala, India. Appl Water Sci. 2012; 2:165-175. doi: 10.1007/s13201-012-0042-5

[39] Amanial H. Assessment of physicochemical quality of spring water in Arbaminch, Ethiopia. J Environ Anal Chem. 2015; 2(157):2380-2391. doi: 10.4172/2380-2391.1000157

[40] Dawit M, Nagari A, Hailu H. Ground water quality assessment of the rural administrative, Dire Dawa city, Eastern Ethiopia. J Hydrogeol Hydrol Eng. 2017; 6(3):2. doi: 10.4172/2325-9647.1000160

[41] Abegaz MT, Midekssa MJ. Quality and safety of rural community drinking water sources in Guto Gida District, Oromia, Ethiopia. J Environ Public Health. 2021; 2021(1): 5568375. doi: 10.1155/2021/5568375

[42] Lewoyehu M. Evaluation of drinking water quality in rural area of Amhara region, Ethiopia: The case of Mecha district. J Chem. 2021; 2021(1):1-11. doi: 10.1155/2021/9911838

[43] Mengstie YA, Desta WM, Alemayehu E. Assessment of drinking water quality in urban water supply systems: The case of Hawassa City, Ethiopia. Int J Anal Chem. 2023; 2023(1): 8880601. doi: 10.1155/2023/8880601

[44] World Health Organization. Guidelines for Drinking-water Quality [Electronic Resource]: Incorporating First Addendum. Vol. 1, Recommendations. Vol. 1. Geneva, Switzerland: World Health Organization; 2006.

[45] Shigut DA, Liknew G, Irge DD, Ahmad T. Assessment of physico-chemical quality of borehole and spring water sources supplied to Robe Town, Oromia region, Ethiopia. Appl Water Sci. 2017; 7:155-164. doi: 10.1007/s13201-016-0502-4

[46] Obeidat MM, Awawdeh M, Al-Rub FA, Al-Ajlouni A. B4), An innovative nitrate pollution index and multivariate statistical investigations of groundwater chemical quality of Umm Rijam Aquifer (North Yarmouk River Basin, Jordan. In: VouddourisK, VoutsaD,editor. Water Quality Monitoring and Assessment. Croatia: InTech; 2012. p. 169-188.

[47] Ravikumar P, Aneesul Mehmood M, Somashekar RK. Water quality index to determine the surface water quality of Sankey tank and Mallathahalli lake, Bangalore Urban district, Karnataka, India. Appl Water Sci. 2013; 3:247-261. doi: 10.1007/s13201-013-0077-2