General Comment No. 15: The Right to Water (arts. 11 and 12), E/C.12/2002/11, January 20, 2002
Non-discrimination and equality
13. The obligation of States parties to guarantee that the right to water is enjoyed without discrimination (Art. 2, para. 2), and equally between men and women (Art. 3), pervades all of the Covenant obligations. The Covenant thus proscribes any discrimination on the grounds of race, colour, sex, age, language, religion, political or other opinion, national or social origin, property, birth, physical or mental disability, health status (including HIV/AIDS), sexual orientation and civil, political, social or other status, which has the intention or effect of nullifying or impairing the equal enjoyment or exercise of the right to water. The Committee recalls paragraph 12 of General Comment No. 3 (1990), which states that even in times of severe resource constraints, the vulnerable members of society must be protected by the adoption of relatively low-cost targeted programmes.
full text of the General Comment: http://www.unhchr.ch/tbs/doc.nsf/0/a5458d1d1bbd713fc1256cc400389e94