Answer
The pH of water, $H_{2}O$, is 7 at $25^{°}$C as it is the temperature within which it will be at it's neutral temperature, and the amount of $H^{+}$ and $OH^{-}$ will be equal.
Work Step by Step
When relying on the Theory of pH measurement, we can see that the amount Hydrogen ions and Hydroxide will be equal at this temperature, and therefore be equal.