Pluto orbits the sun more than 29 times farther away than Earth, with a surface temperature estimated to be about 380 degrees below zero Fahrenheit.
The environment on Pluto, which 2 percent of astronomers voted on no longer being really a planet anyway, is far too cold to allow liquid water on its surface. Its moons are in the same frigid environment.
Pluto's remoteness and small size make it difficult to observe so take speculation about Charon, a moon of Pluto, having cracks in its surface and perhaps a subterranean ocean of liquid water, with a grain of otherworldly salt. In July of 2015, NASA's New Horizons spacecraft will be the first to visit Pluto and Charon, until then we have numerical models and a fair amount of educated guessing.