Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile

Valenzuela, Mariela; Lagos, Bernardo; Claret, Marcelino; Mondaca, M. A.; Pérez, Claudio; Parra, Óscar

doi:10.4067/s0718-58392009000200013

Cited by 26 publications

(22 citation statements)

References 27 publications

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“…Los autores indican como probables causas de la contaminación, el fácil acceso de animales domésticos a los pozos, el material de revestimiento permeable y el escurrimiento de fecas por la precipitación local, que ha influido directamente en la concentración de bacterias en los pozos 25 .…”

Section: Microbiologíaunclassified

Calidad microbiológica del agua de un área agrícola-ganadera del centro sur de Chile y su posible implicancia en la salud humana

Valenzuela

Godoy

Almonacid

et al. 2012

Rev. chil. infectol.

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Microbiological quality of water in livestock area of southern Chile and its possible implications on human healthIntroduction: A significant proportion of water for human consumption has an underground origin becoming 80% in Chilean rural areas where profound wells represent the only search of water for human and animal beverage. Aim: To study the microbiological quality of water from agricultural land for livestock production in the province of Valdivia (40°S), Chile and its potential impact on human health. Material and Method: Water samples were collected monthly (2008 -2009), at the entrance and exit of a water stream running through the field and in well water used for human and animal consumption. The total coliform (Tc) and Escherichia coli were determined by the confirmatory method Quanti-Tray together with other physicochemical assessments in the water and climatic variables. Results: In samples from the stream water and wells, the Most Probable Number of Tc and E. coli exceeded the standard Chilean Norm of Water Quality (NCh 409/1) for human consumption. Conclusion: These results show the need to regulate the environmental impact of farming and cattle production and to monitor the drinking water to meet the minimum standards of health protection.

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Section: Microbiologíaunclassified

Calidad microbiológica del agua de un área agrícola-ganadera del centro sur de Chile y su posible implicancia en la salud humana

Valenzuela

Godoy

Almonacid

et al. 2012

Rev. chil. infectol.

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“…Previous work has shown that microbiological contamination is dispersed, sporadic, and influenced by a range of interacting environmental factors including the physical characteristics of a watershed, climatic conditions, and agricultural management practices [37]. The influence of human activities on the water quality of the Tibetan Plateau is mostly manifest by production process and day-to-day life; human activities which affect the water quality of the Xincang River Basin mainly include animal husbandry and domestic sewage.…”

Section: Sources Of Microbial Contaminationmentioning

confidence: 99%

The Spatiotemporal Distribution of Two Bacterial Indexes in a Small Tibetan Plateau Watershed

Zhao¹,

Song²,

Chen³

et al. 2017

Preprint

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Microbial contamination is now more common than chemical contamination in Tibet, and water-borne microbes can cause a number of diseases that threaten public health. Thus, in order to clarify the spatiotemporal distribution of bacteria in small watersheds for which there is no data in Tibet, we set up four sampling points along an upstream-downstream transect of the Xincang River Basin. We collected 239 water samples in 2014 and 2015, and evaluated their total constituent numbers of bacteria (TB) and coliforms (TC). The results of this study show that the microbial contamination of the Xincang River Basin is mild-to-moderate in terms of TB and TC contents, and that these concentrations vary significantly in different seasons. Results show that in summer TB and TC concentrations in the downstream section of this river were highest and that microbial contamination was most serious. Data also demonstrate that precipitation is the most important factor underlying increases in TB and TC concentrations during the summer months; both these variables are significantly correlated with precipitation, while animal husbandry and domestic sewage are the main sources of microbial contamination overall. The results of this study are likely to reflect the basic characteristics of small watersheds for which there is no data to some extent, and are thus of significant practical importance for protecting their ecological environments and promoting sustainable development.

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“…The main reason for this is that rainfall runoffs carry a lot of microbial contamination sources into the river and cause the increase of microbial concentration in summer. Previous work has shown that microbiological contamination is dispersed, sporadic, and influenced by a range of interacting environmental factors including the physical characteristics of a watershed, climatic conditions, and agricultural management practices [40]. The main bacterial contamination sources in Tibetan Plateau are mostly manifest by production processes and daily life, which mainly include animal husbandry and domestic sewage.…”

Section: Sources Of Microbial Contaminationmentioning

confidence: 99%

The Spatiotemporal Distribution of Two Bacterial Indexes in a Small Tibetan Plateau Watershed

Zhao

Chen

Yao

et al. 2017

Water

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Microbial contamination is now more common than chemical contamination in Tibet, and water-borne microbes can cause a number of diseases that threaten public health. Thus, in order to clarify the spatiotemporal distribution of bacteria in small watersheds for which there is no data in Tibet, four sampling points were set up along an upstream-downstream transect of the Xincang River Basin. A total of 239 water samples were collected in 2014 and 2015, and their total constituent numbers of bacteria (TB) and coliforms (TC) were evaluated. The results of this study show that the microbial contamination of the Xincang River Basin is mild-to-moderate in terms of TB and TC contents, and that these concentrations vary significantly in different seasons. The results show that in summer, TB and TC concentrations and microbial contamination are almost at the same level in upstream, midstream, and downstream sections; however, in the other three seasons, microbial contamination in the downstream section is more serious than in the upstream and midstream sections. The data also demonstrates that concentrated precipitation and local contamination sources are important factors underlying increases in TB and TC concentrations during the summer months. The results of this study are likely to reflect the basic characteristics of small watersheds for which there is no data to some extent, and are thus of significant practical importance for protecting their ecological environments and promoting sustainable development.

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Fecal Contamination of Groundwater in a Small Rural Dryland Watershed in Central Chile

Cited by 26 publications

References 27 publications

Calidad microbiológica del agua de un área agrícola-ganadera del centro sur de Chile y su posible implicancia en la salud humana

Calidad microbiológica del agua de un área agrícola-ganadera del centro sur de Chile y su posible implicancia en la salud humana

The Spatiotemporal Distribution of Two Bacterial Indexes in a Small Tibetan Plateau Watershed

The Spatiotemporal Distribution of Two Bacterial Indexes in a Small Tibetan Plateau Watershed

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