Step 1: Alternate valid pair:
Other accepted causes include agricultural runoff (pesticide and fertiliser residues washed into rivers) and the practice of immersing religious idols/offerings and dumping solid waste into rivers.
Step 2: State them:
Cause 1 — chemical runoff from farms (fertilisers/pesticides) contaminating water; Cause 2 — dumping of solid waste and immersion of idols/religious material into rivers.
Step 3: Final Answer:
Agricultural chemical runoff and dumping of solid/religious waste into rivers are two other valid causes of water pollution in India.