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Marginal reduction in polluted river stretches across India, most in Maharashtra: CPCB report

The CPCB report also noted a drop in the number of the most polluted stretches in its analysis of rivers.

polluted riverA polluted river stretch refers to two or more polluted locations on a river in a continuous sequence. (Representational image/File)

Polluted river stretches in India have decreased marginally from 311 to 296, with a reduction in most polluted stretches as well, according to a Central Pollution Control Board (CPCB) assessment report released Monday.

The CPCB reviewed water quality data from 2022 and 2023, covering 2,116 locations, and found that 296 river stretches were polluted on 271 rivers across 32 states and Union Territories. Maharashtra continues to have the highest number (54) of polluted river stretches. The previous assessment for identifying polluted stretches was carried out in 2022, using data from 2019 and 2021, while 2020 was omitted due to the pandemic.

A polluted river stretch refers to two or more polluted locations on a river in a continuous sequence. Stretches where the biochemical oxygen demand (BOD) exceeds 3 milligrams/litre (mg/L) are identified as polluted stretches by CPCB. BOD in excess of prescribed levels indicates a higher pollution load, especially for the health of aquatic life.

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There are five such priority categories, with Priority Class V, with BOD level of 3.1-6 mg/L, indicating the least pollution and in need of low intervention. BOD levels less than 3 mg/L are considered fit for bathing.

Stretches with BOD concentrations exceeding 30 mg/L are categorised as Priority I or the most polluted stretches. Out of 296 stretches identified as polluted, 37 were classified as the most polluted, or Priority I. This number has also seen a slight drop from 46 in the previous report.

These 37 stretches were identified across 14 states, with the highest number, five, in Tamil Nadu, Uttar Pradesh, and Uttarakhand; four in Gujarat, and three in Karnataka.

Among the most notable polluted river stretches included Yamuna’s stretch from Palla to Asgarpur in Delhi, Sabarmati in Ahmedabad, Chambal’s stretch from Nagda to Gandhisagar dam in Madhya Pradesh, and stretches of Tungabadhra and Sarabanga in Karnataka and Tamil Nadu, respectively.

River stretches with deterioration in water quality

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Among the more prominent rivers where stretches were identified to have deteriorated in quality were Jhelum in Jammu and Kashmir; Ganga, Ramrekha and Sikrahna in Bihar; Hasdeo, Mahanadi in Chhattisgarh; Sal and Mapusa in Goa; Cauvery, Tungabhadra in Karnataka; Periyar in Kerala, and Amba and Savitri in Maharashtra. It also included stretches on Krishna in Telangana and Kosi in Uttarakhand.

Explained
Reviving rivers

In 2018, the NGT took suo motu cognisance of the CPCB’s river pollution assessment based on news reports and ordered states and the Centre to prepare action plans for rejuvenation. According to the CPCB’s latest report, river rejuvenation committees were formed to develop action plans and reduce pollution. The CPCB has directed states to focus on river catchment and basin management, floodplain protection and the treatment of sewage water.

In 2018, the National Green Tribunal (NGT) took suo motu cognisance of the CPCB’s river pollution assessment based on news reports and ordered states and the Centre to prepare action plans for rejuvenation.

According to the CPCB’s latest report, river rejuvenation committees were formed to develop action plans and reduce pollution. The CPCB has directed states to focus on river catchment and basin management, floodplain protection, and the treatment of sewage water.

Currently, water quality monitoring is carried out at 2,155 locations on 645 rivers under the National Water Quality Monitoring Programme, a nationwide initiative by the CPCB in collaboration with state pollution control boards.

An award-winning journalist with 14 years of experience, Nikhil Ghanekar is an Assistant Editor with the National Bureau [Government] of The Indian Express in New Delhi. He primarily covers environmental policy matters which involve tracking key decisions and inner workings of the Ministry of Environment, Forest and Climate Change. He also covers the functioning of the National Green Tribunal and writes on the impact of environmental policies on wildlife conservation, forestry issues and climate change. Nikhil joined The Indian Express in 2024. Originally from Mumbai, he has worked in publications such as Tehelka, Hindustan Times, DNA Newspaper, News18 and Indiaspend. In the past 14 years, he has written on a range of subjects such as sports, current affairs, civic issues, city centric environment news, central government policies and politics. ... Read More

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