A study by the SOS Mata Atlântica Foundation published this Tuesday (22) shows that there may have been one Almost 20% increase in Tietê pollution point this year. The study estimates that about 194 kilometers of the river are of poor quality in 2019, compared to 163 kilometers in 2019. The data come from the report “Observation of the Tietê 2020 – The portrait of water quality and the development of the impact indicators of the Tietê River- Project “.
The deterioration may be related to an operation to open gates and dams along the river to drain the water from the storms that caused major floods in the capital in February. Together with the water the Tietê brought rubbish, mud and other pollutants inland This worsened the water quality in Porto Feliz and Laranjal, 240 kilometers from the capital.
Nevertheless, the report also shows that some sections of the river have improved in quality with the pandemic. Now the Tietê is several kilometers away from its source before it gets dirty. In 201
in addition, No section of Tietê was poor quality in 2020. This level of pollution was only found at collection points in tributaries. Last year Tietê had 18 kilometers of poor quality water.
The extent of the river with poor water quality this year was estimated by the foundation. This is because the pandemic has prevented the monitoring teams from assessing as often as necessary. A. 44 km between São Paulo and Barueri, historically one of the most polluted. According to the organization itself, it can be assumed that this region is still of poor quality, although it was not classified as such in the final report.
“This section between the municipalities of São Paulo, from the Annexuera motorway bridge to the Barueri municipality, is heavily polluted and shows only minor differences in the state of water quality in the historical monitoring series,” explains the foundation.
The Tietê River in the section that flows through the capital São Paulo at the time of Freguesia do Ó, in a photo from this Thursday, September 17, 2020. – Photo: Daniel Teixeira / Estadão Contents
According to the measurements, 150 kilometers of the river were counted with water under conditions considered to be poor, which would mean a reduction in the point of pollution in the Tietê this year compared to 163 kilometers in 2019. With the inclusion of the route in the greater São Paulo area, the value increases to 194 polluted kilometers, which corresponds to an increase of 19% compared to the previous year.
Although this stretch may have remained polluted, other areas have improved this year. The length of the river with good water quality increased in various places, mainly in the headwaters and in the Botucatu region at the beginning of the Barra Bonita reservoir.
In the report, the foundation assesses that the improvement may be related Changes in society’s behavior during the pandemic, especially less rubbish on the streets and less vehicle soot, with less car traffic.
In addition, the lower demand from industry and rural producers for water, motivated by the economic slowdown from the pandemic, may also have contributed to the river moving more to dilute the pollutants in those sections.
THE good or regular water conditionthat enables aquatic life, public utilities, food production, or recreational activities; spanned 382 kilometersThis corresponds to 66% of the 576 kilometers of the river that were analyzed. Last year there was 413 kilometers good or regular.
The water quality of the Tietê River is monitored again after months