New Delhi: DJB on Thursday shut down its two water treatment plants as officials said level of ammonia had been rising beyond permissible levels since the past couple of days. On Thursday, it shot up so much that the plants had to be shut down and the water released back into the river. According to sources, accumulating sullage in the river near the Panipat area was being washed into the Capital after Haryana recently released water for the Wazirabad pond.