Drinking water quality has drawn enormous attention from scientific communities, the industrial sector, and the common public in several countries during the last couple of decades. The scholarship in science and technology studies somehow overlooked this crucial domain. This article attempts to contribute to this gray area by exploring how drinking water quality is understood in Indian water policies, laws, and courtrooms. The article argues that water policies and laws in India were significantly shaped by international treaties and global environmental (...) stewardship. In the courtrooms, the Indian judiciary employed minimum science-based evidence in decision making in the context of drinking water–related cases; rather they used a rights-based approach and minimally engaged with the issue of drinking water quality/standards. Whatever little science used as valid science by the judges in the decision making was entirely expert-based. The reliance of the judges on the scientific expertise of the experts representing regulatory organizations and public institutions was another unique characteristic of the relationship between science and law in India. (shrink)