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Well Water Likely Available Across Mars (behindtheblack.com)
schwit1 quotes Behind the Black: A science paper released today and available for download [pdf] cites evidence from about two dozen deep impact craters located from the equator to 37 degrees north latitude that Mars has a ground ice table at an elevation that also corresponds to other shoreline features.
The paper calls this evidence of "planet-wide groundwater" with elevations that "notably coincide with the elevation of some ocean shorelines proposed by previous authors."
Science writer Robert Zimmerman adds that "The evidence suggests that this deep groundwater water table (as ice) almost certainly still exists at all latitudes, though almost entirely underground...
"All you will have to do is dig a well..."
The paper calls this evidence of "planet-wide groundwater" with elevations that "notably coincide with the elevation of some ocean shorelines proposed by previous authors."
Science writer Robert Zimmerman adds that "The evidence suggests that this deep groundwater water table (as ice) almost certainly still exists at all latitudes, though almost entirely underground...
"All you will have to do is dig a well..."
More precisely it is at the level that is 4 km below the "Mars 17 DATUM", which could be thought of as a possible sea level reference if Mars actually had surface water oceans. It just means you need to be located at a site with an elevation lower than that reference to find the water. Still, that doesn't mean it will be easy to access or treat.