An assessment of the surface water state resources was provided, which included the analysis of the components of the salt composition, namely chlorides and sulfates. The trophic-saprobiological (ecological-sanitary) index was determined taking into account the absolute values of indicators: suspended substances, pH, phosphates, dissolved oxygen, BOD5. To determine the index of specific indicators of toxic action, the absolute values of the components were used: copper, zinc, oil products, etc. It was determined that the category of water quality according to the components of the salt composition in the pre-war period was 6.1, which is less than in 2022 (6.5); according to tropho-saprobiological indicators (environmental and sanitary) - the pre-war period is 4.3, which is less compared to 2022 (5.0); according to specific indicators - in the pre-war period it is less and is 4.7 compared to 2022, when this index was 5.0. All defined surface water quality classes correspond to the degree of pollution "dirty" or "very dirty" and the state "poor" or "very poor". During the studied period, there is a steady trend towards a gradual increase in hardness, dry residue, sulfates, and chlorides in surface water. The level of pH, BOD5, dissolved oxygen fluctuates within the normal range with minor deviations.
1. BUWR of Southern Buh. (2023). Update of the staff of the Southern Bug Basin Council. Retrieved from http://www.buvr.vn.ua/.
2. Dynamika zaboru i vykorystannia vody po Mykolaivskii oblasti za 2006 – 2015 rr. (2016). Mykolaiv.
3. Dynamika zaboru i vykorystannia vody po Mykolaivskii oblasti za 2015 – 2020 rr. (2021). Mykolaiv.
4. Common Implementation Strategy for the Water Framewormk Directive (2000/60/EC). (2003). Guidance document № 10 River and lakes – Typology, reference conditions and classification systems. Retrieved from https://circabc.europa.eu/sd/a/06480e87-27a6-41e6-b165-0581c2b046ad/Guid...(WG%20A).pdf
5. Hrytsenko, A. V., Vasenko, O. H., & Vernichenko, H. A.(2012). Metodyka ekolohichnoi otsinky yakosti poverkhnevykh vod za vidpovidnymy katehoriiamy. Kh.: UkrNDIEP.
6. Khilchevskoho, V. K. (2009). Vodni resursy ta yakist richkovykh vod baseinu Pivdennoho Buhu. K.: Nika-tsentr.
7. Mitryasova, O., Shybanova, A., & Dzhumelia, E. (2022). Prognosis Models of Nitrates and Orthophosphates Content in Surface Waters. Environmental safety and nature management, 4(41), 33–44. doi: https://doi.org/10.32347/2411-4049.2022.4.30-43
https://doi.org/10.32347/2411-4049.2022.4.30-43
8. Mitryasova, O., Pohrebennyk, V., Shybanova, A., & Nosyk, A. (2022a). Prognosis models of surface water status. Water Supply and Wastewater Disposal: Monografie. Politechnika Lubelska.
9. Mitryasova, O., Mariychuk, R., Shybanova, A., & Dzhumelia, E. (2022b). Prognosis Models of Nitrates and Orthophosphates Content in Surface Waters. Proceedings of the 13th International Annual Conference “Global Environmental Development & Sustainability: Research, Engineering & Management”, (November 17–18, 2022, Budapest, Hungary, Obuda University.
10. Rehionalna dopovid pro stan navkolyshnoho pryrodnoho seredovyshcha v Mykolaivskii oblasti u 2020 r. (2020). Rehionalnyi ofis vodnykh resursiv v Mykolaivskii oblasti, Mykolaiv. Retrieved from https://mepr.gov.ua/wp-content/uploads/2023/04/Regionalna-dopovid-Mykola...
11.. Romashchenka, M. I., Khvesyka, M. A., & Mykhailova, Yu. O. (2015). Vodna stratehiia Ukrainy na period do 2025 roku (naukovi osnovy). K.: Comprint. Retrieved from http://iwpim.com.ua/wp-content/uploads/2015/10/11_03_2015.pdf
12. Rybalova, O. V. (2011). A comprehensive approach to determining the ecological status of small river basins. The problems of environmental protection and ecological safety, XXXIII, 88 – 97.
13. Vasenko, O. H., Vernychenko-Tsvetkov, D. Yu., & Kovalenko, M. S. (2008). Ecological assessment of the state of surface waters of Ukraine taking into account regional hydrochemical features. UkrNDIEP, 36–53.
14. Voda pytna: vymohy ta metody kontroliuvannia yakosti, DSTU 7525:2014 (2014). Retrieved from https://zakon.isu.net.ua/sites/default/files/normdocs/1-10672-dstu_voda_...
15. Vodna stratehiia Ukrainy do 2050 r.: Rozporyadzhennyam Kabinetu Ministriv Ukrayiny 2022, № 1134-r. (2022). Retrieved from https://zakon.rada.gov.ua/laws/show/1134-2022-%D1%80#Text
16. Water Code of Ukraine: Law of Ukraine dated 1995, № 213/95-VR. (1995). Retrieved from http://zakon2.rada.gov.ua/laws/ show/213/95-%D0%B2%D1%80
17. Water resources of Mykolaiv region. (2023). Retrieved from http://fishing-ua.org.ua/mykolaivska/