The document discusses pollution issues affecting a lake in Rajarajeshwarinagar, India. Sewage was allowed to mix with rainwater and drain into the lake during its rejuvenation. This caused high levels of nitrates and phosphates in groundwater, and an outbreak of diseases. Analyses found that sewage water percolating from the lake was the root cause of pollution. Allowing sewage mixing was questioned as the wrong decision, as pollution makes water unfit for use and caused cattle deaths from nitrate toxicity. Reducing pollution from sources like fertilizers and sewage is important to protect lake ecology and public health.