Water runes are one of the four basic elemental runes. They are used to cast water attacks. They can be runecrafted at a water altar by any player with level 5 runecrafting or higher. Runecrafting water runes gives 6 runecrafting experience per rune essence. The water altar is currently south of Lumbridge, in the Lumbridge Swamp. If a staff of water is wielded, a player does not have to use water runes.
The spells that require water runes are:
Water runes are used to finish fishing urns.