A) Politically, there are a variety of religions and opinions that make up the population that votes in the government. However, there is a well-established problem with bribery within the Indian government that prevents much action from taking place. This seriously diminishes the chances of the river being cleaned.
B) Technologically, the problem is more economic. Technologies exist to clean virtually everything in the river, from the use of biotechnologies evoking properties of bacteria to your everyday water cleaning facilities across the world. But some are very expensive.
C) Economic problems may be the biggest. It would be a large economic commitment to clean everything in that river.
D) Further, some of the solutions for the problem may not have the best long term effects on the health of the population and ecosystem in and around the river. However, the current health risks due to pollution of the river significantly outweigh them.
E) Culturally, it would be very difficult to get highly religious populations to stop using the river for spiritual (and sometimes unsanitary) purposes. This simply has to be recognized as a constant.
F) I personally find it unethical to leave something so naturally beautiful in complete waste. The water needs to be cleaned.
6 problems