"Um." The question is a good one in that it's not touching on anything he can't handle, anything that makes it worse. It's less than helpful in that it makes him realize he doesn't know the local geography all that well yet. "Ground water like that, I... it's... I'm not the best person to ask." He doesn't know who that would be instead, especially as the water seems to be basically potable without needing any treatment. That strikes him as odd, but given everything else about the place that's clearly under the control of external forces and unknown masters, and, kriff, what do they want? Normally they feel faintly benign to him, given it he weren't here he'd be a bit of a smudge on smoking ship debris, but right now...