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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">RUDN Journal of Ecology and Life Safety</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Ecology and Life Safety</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Экология и безопасность жизнедеятельности</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2313-2310</issn><issn publication-format="electronic">2408-8919</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">35406</article-id><article-id pub-id-type="doi">10.22363/2313-2310-2023-31-2-251-264</article-id><article-id pub-id-type="edn">GZTKLH</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Environmental Monitoring</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Экологический мониторинг</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Comprehensive water quality assessment of surface sources in the city of Latacunga and the canton Pedro Vicente Maldonado in Ecuador</article-title><trans-title-group xml:lang="ru"><trans-title>Комплексная оценка качества воды поверхностных водоисточников города Латакунга и кантона Педро Висенте Мальдонадо в Республике Эквадор</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6927-7863</contrib-id><name-alternatives><name xml:lang="en"><surname>Salazar Flores</surname><given-names>Cristian A.</given-names></name><name xml:lang="ru"><surname>Саласар Флорес</surname><given-names>Кристиан Александер</given-names></name></name-alternatives><bio xml:lang="en"><p>PhD student, Institute of Environmental Engineering</p></bio><bio xml:lang="ru"><p>аспирант, институт экологии</p></bio><email>cristian_salazarf@hotmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7763-5034</contrib-id><name-alternatives><name xml:lang="en"><surname>Kurbatova</surname><given-names>Anna I.</given-names></name><name xml:lang="ru"><surname>Курбатова</surname><given-names>Анна Игоревна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Biological Sciences, Associate Professor, Department of Environmental Safety and Product Quality Management, Institute of Environmental Engineering</p></bio><bio xml:lang="ru"><p>кандидат биологических наук, доцент департамента экологической безопасности и менеджмента качества продукции, институт экологии</p></bio><email>kurbatova-ai@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8051-8528</contrib-id><name-alternatives><name xml:lang="en"><surname>Mikhaylichenko</surname><given-names>Kseniya Y.</given-names></name><name xml:lang="ru"><surname>Михайличенко</surname><given-names>Ксения Юрьевна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Biological Sciences, Associate Professor, Department of Human Ecology and Bioelementology, Institute of Environmental Engineering</p></bio><bio xml:lang="ru"><p>кандидат биологических наук, доцент департамента экологии человека и биоэлементологии, институт экологии</p></bio><email>mikhaylichenko-kyu@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Barannikova</surname><given-names>Svetlana I.</given-names></name><name xml:lang="ru"><surname>Баранникова</surname><given-names>Светлана Игоревна</given-names></name></name-alternatives><bio xml:lang="en">Student, Institute of Environmental Engineering</bio><bio xml:lang="ru">студент, институт экологии</bio><email>1032193179@rudn.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">RUDN University</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-07-15" publication-format="electronic"><day>15</day><month>07</month><year>2023</year></pub-date><volume>31</volume><issue>2</issue><issue-title xml:lang="en">VOL 31, NO2 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 31, №2 (2023)</issue-title><fpage>251</fpage><lpage>264</lpage><history><date date-type="received" iso-8601-date="2023-07-17"><day>17</day><month>07</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Salazar Flores C.A., Kurbatova A.I., Mikhaylichenko K.Y., Barannikova S.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Саласар Флорес К.А., Курбатова А.И., Михайличенко К.Ю., Баранникова С.И.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Salazar Flores C.A., Kurbatova A.I., Mikhaylichenko K.Y., Barannikova S.I.</copyright-holder><copyright-holder xml:lang="ru">Саласар Флорес К.А., Курбатова А.И., Михайличенко К.Ю., Баранникова С.И.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/ecology/article/view/35406">https://journals.rudn.ru/ecology/article/view/35406</self-uri><abstract xml:lang="en"><p style="text-align: justify;">A study of the quality of drinking water sources - surface waters of the river systems of the city of Latacunga and the canton of Pedro Vicente Maldonado, Ecuador, was carried out during 2018 and 2019. The general sanitary water quality index (WQI) was calculated according to Russian methods, the water quality index of the National Sanitation Foundation (NSF-WQI) of the Ecuadorian water quality regulation. Results from parameterizing the water quality, obtained by WQI and NSF-WQI methods and combined into an overall scheme, were used to generate the rating scale for assessing the hydro-ecological status of aquatic ecosystems. When carrying out a qualitative and quantitative analysis of water from river reservoirs, the excess of the threshold limit values of such indicators as the biological oxygen demand and iron was determined. The calculations show that the WQI method and the NSF-WQI method lead to similar results when assessing the water quality of both reservoir of the city of Latacunga and canton of Pedro Vicente Maldonado. According to the WQI method, the hydrological state of the reservoir of the city of Latacunga was characterized in the range of a scale from “Crisis” to “Risk”, while according to the NSF-WQI method the state was assessed as “Risk”. The hydrological state of the reservoir of the canton of Pedro Vicente Maldonado, was assessed as “Risk” by both the WQI method and the NSF-WQI method. Furthermore, in none of the water bodies under study is the environmental “catastrophe” not recorded.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Проведено исследование качества источников питьевой воды - поверхностных вод речных систем города Латакунга и кантона Педро Висенте Мальдонадо в Республике Эквадор в 2018-2019 гг. Рассчитаны общесанитарный индекс качества воды (ИКВ) по российским методикам, индекс качества воды Национального фонда охраны здоровья (NSF-WQI) эквадорского регулирования качества воды. Результаты параметризации качества воды, полученные методами ИКВ, NSF-WQI и объединенные в общую схему, позволили составить с их помощью шкалу оценки гидроэкологического состояния водных экосистем. При проведении качественного и количественного анализа воды из речных водохранилищ определены превышения нормативных значений по таким показателям, как биологическое потребление кислорода и железо. Приведенные расчеты показывают, что методы ИКВ и NSF-WQI приводят к аналогичным результатам при оценке качества воды как водохранилища города Латакунга, так и водохранилища кантона Педро Висенте Мальдонадо. Согласно методу ИКВ, состояние воды водохранилища города Латакунга характеризовалось в диапазоне шкалы от «Кризис» до «Риск», в то время как по методу NSF-WQI состояние оценивалось как «Риск». Состояние водной экосистемы водохранилища кантона Педро Висенте Мальдонадо оценивалось как «Риск» и по методу ИКВ, и по методу NSF-WQI. При этом экологическая катастрофа не фиксируется ни в одном из рассматриваемых водных объектов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>surface water quality</kwd><kwd>water sources</kwd><kwd>water quality indices</kwd><kwd>hydroecological state of water ecosystems</kwd><kwd>river reservoirs</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>качество поверхностных вод</kwd><kwd>водоисточники</kwd><kwd>индексы качества воды</kwd><kwd>гидроэкологическое состояние водных экосистем</kwd><kwd>водохранилища</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Biswas AK, Tortajada C. Water quality management: An introductory framework. International Journal of Water Resources Development. 2011;27(1):5-11.</mixed-citation></ref><ref id="B2"><label>2.</label><citation-alternatives><mixed-citation xml:lang="en">Zubarev VA. Hydrochemical indices for surface water quality assessment. 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