NASA claims to have found water ice on Mars. Time lapse photography of a trench dug by the MarsPhoenix lander shows that small chunks of “bright material” have disappeared. According to investigators, the material must have been H2O ice for it to have sublimated over the course of 4 days.

…the white stuff cannot be CO2 ice because the phase change diagram for carbon dioxide shows that at the reported temperature ( -32 degrees C ) and pressure, CO2 is a vapor.

Bright Chunks At Phoenix Lander’s Mars Site Must Have Been Ice - Phoenix Mars Mission Home news release, June 19, 2008

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