Daijiworld Media Network - Bengaluru

Bengaluru, Oct 22: The condition of rivers across Karnataka has become a major cause for concern. A recent report released by the Karnataka State Pollution Control Board (KSPCB) has revealed that none of the state’s rivers are directly fit for drinking, with the Netravathi River being the only one classified as ‘B’ grade, meaning its water can be used for domestic purposes after proper treatment.

Tests conducted in September 2025 examined the water quality of rivers including the Cauvery, Krishna, Bhima, Tungabhadra, Bhadra, Shimsha, Kabini, Arkavathi, and Netravathi. The report found that not a single river met the ‘A’ category standards (directly potable water). Only the Netravathi River achieved ‘B’ category quality.

Cauvery falls to ‘C’ category – a worrying sign

The Cauvery River, considered Karnataka’s lifeline, has been downgraded to the ‘C’ category, a worrying development. This classification indicates water suitable only for fisheries, agriculture, and related activities, but unfit for direct human consumption.

Rivers such as Krishna, Tungabhadra, Bhadra, Shimsha, Lakshmanateertha, and Kabini have also been placed in the ‘C’ category, with their waters requiring treatment before any use. The Bhima, Kagina, and Arkavathi rivers have been classified as ‘D’ grade, while the Vrishabhavathi River in Bengaluru ranks the lowest, falling under the ‘E’ or ‘Z’ category—completely unfit for any use.

Industrial chemical discharge, sewage contamination, and high biochemical oxygen demand (BOD) levels have emerged as major causes of this severe pollution. Ideally, the dissolved oxygen level in water should range between 6–8 mg per litre; however, in several rivers it has dropped below 3 mg. Excessive presence of coliform and faecal coliform bacteria has further degraded water quality.

Severe threat to ecology and rural livelihoods

The report is more than just a compilation of data—it serves as a red alert for the health, livelihood, and environmental stability of millions of people who depend on these rivers. The deteriorating condition of Karnataka’s rivers poses a serious threat to biodiversity and underscores the urgent need for immediate remedial action.