The regional MP Pollution Control Board (MPPCB) office has served a show-cause notice to Choithram Hospital after the death of nearly all the fish subjected to bioassay tests. Bioassay testing involves exposing living aquatic organisms to samples of wastewater to determine toxicity.
"The fish were kept in two wastewater samples collected from the hospital for 96 hours. All the fish kept in one sample died, while in the other 90 per cent died," said a source. The acceptable mortality rate, he added, is 10%.
The tests showed that BOD levels in the samples stood at 110 to 120 milligrams per litre. "The standard is 90 mg/litre," said the source. Two samples were taken from the outlet point on October 30. "We found that untreated wastewater was being released into a nearby nullah polluting the Saraswati river (and, consequently, the Kshipra)," the source added.
Contacted, the hospital management refused to comment on whether the samples were polluted or not. "We will submit a written reply and are trying to comply with PCB norms. The results will be visible in the coming days," said Dr Amit Bhatt, deputy director, medical services.