The number of states involved in these interstate water disputes tribunals are: (a) Mahadayi Water Disputes Tribunal: Goa, Karnataka, Maharashtra (3 states - i) (b) Godavari Water Disputes Tribunal: Andhra Pradesh, Maharashtra, Karnataka, Madhya Pradesh, Odisha (5 states - ii) (c) Narmada Water Disputes Tribunal: Madhya Pradesh, Gujarat, Maharashtra, Rajasthan (4 states - iii) (d) Mahanadi Water Disputes Tribunal: Odisha, Chhattisgarh (2 states - iv)