Valence Shell Electron Pair Repulsion
Water has 4 regions of electron density around the central oxygen atom (2 bonds and 2 lone pairs). These are arranged in a tetrahedral shape. The resulting molecular shape is bent with an H-O-H angle of 104.5°.
Related structures H2O | NH3 | CH4 | PF5 |SF4 |ClF3 | SF6 | XeF4