Question

what is the major cause for failure of the ganga action plan

Answer 1

The threat to the ecosystem of ganga caused by the sewage and industrial effluents was realised by the govt of india in 1986. Ganga action plan is failed due to incorporation of people.
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Answer 2

The major cause of the failure of the Ganga action plan was the huge gap between the demand and availability of the sewage treatment capacity as well as there was lack of fresh water availability.

There were a number of action plans were decided which failed to implement like low cost sanitation works, sewage treatment plants, crematoria work and other such things.