Summary Water conservation is of particular importance for arid regions, including many Muslim-majority countries. With the added pressures of human population growth and expansion and global climate change, water conservation efforts are imperative to extending the life of current water supplies as well as to sourcing water treatment methods that are religiously congruent. We review Qur’anic verses that address water usage and conservation. We searched the English translations of the King Fahd Complex for the Printing of the Holy Qur’an and the King Saud University Electronic Moshaf Project for Qur’anic scripture related to water and water conservation. A total of 25 verses were found that related to creation, water usage for agriculture and food provision/production and as a common resource for humanity. Qur’anic scripture encourages gratitude for water and wise stewardship of this resource. Specific prohibitions against the reuse of water (e.g., treated water) were not found, and recent Islamic literature supports the use of cleansed greywater. Treated greywater may thus be an additional source for agricultural needs, thus reducing the stress placed on already limited water supplies. Water conservation falls within Qur’anic scripture.