The Bhabha Atomic Research Centre (BARC) has reported that 98% of groundwater samples collected across Karnataka comply with the uranium safety limits set by the Atomic Energy Regulatory Board (AERB). The study, conducted in collaboration with the Karnataka State Groundwater Authority, analyzed samples from all 30 districts of the state.
Study findings on uranium levels
According to BARC scientists, the uranium concentration in the vast majority of samples is well within the safe threshold of 60 micrograms per litre, as prescribed by AERB. Only about 2% of the samples showed elevated levels, primarily in regions with granitic bedrock. The study emphasized that even in these cases, the levels do not pose an immediate health risk.
Health implications of uranium ingestion
Further, BARC clarified that the gastrointestinal absorption of uranium in adults is low at 2%, meaning that only a small fraction of ingested uranium enters the bloodstream. Additionally, only a minimal amount transfers from blood to breast milk, reducing concerns for nursing mothers. The findings aim to allay public fears about uranium contamination in drinking water.
Background and monitoring efforts
The study was part of a broader nationwide assessment of groundwater quality. BARC has been monitoring uranium levels since 2014, and the latest data reaffirm that Karnataka's groundwater is largely safe. The state government has been urged to continue regular testing, especially in areas with higher natural uranium background.
