If industrial units do not have functional PETPs, then they will not be allowed to function any more, the court said.
Officials have admitted that the problem of frothing will continue until sewage treatment plants in Delhi are upgraded to meet the new standards.
Amid criticism over the formation of foam in the Yamuna -- a sign of its hazardous water quality -- the Delhi government on Tuesday deployed 15 boats to remove the froth with the help of ropes.
The green panel said that innocent people drank and bathed in the river with reverence, without knowing that it may adversely affect their health.
'There will always be hiccups given that the Namami Gange programme is spread over different sectors and involves several agencies.'