Why Bangalore’s lakes are getting increasingly polluted

The Central Pollution Control Board (CPCB) has urged the Karnataka State Pollution Control Board (KSPCB) to identify pollution sources in stagnant water bodies across Bengaluru and the state. In a letter dated January 6, 2025, CPCB highlighted concerns after reviewing 2023 water quality data under the National Water Quality Monitoring (NWMP) program. Key parameters like dissolved oxygen, pH, biological oxygen demand, and faecal coliform levels showed alarming trends, prompting CPCB to call for immediate corrective action.

Rising toxicity in Bengaluru’s lakes

KSPCB’s monthly water quality reports indicate increasing toxicity in the city’s lakes and tanks, with the number of water bodies classified under the worst water quality (Class E) doubling in some months, even during the monsoon.

Call for accountability

Lake activists criticize KSPCB for restricting its role to sample collection and report generation rather than taking enforcement action. “It is high time they analyze the reports, punish the guilty, and end lake pollution,” said Raghavendra Pachhapur of ActionAid Association.

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