"A scientific report has found water to be undrinkable in the wine mecca of Martinborough and probably contaminated with Giardia.
Martinborough man George Sanderson, who sought scientific help to solve the mystery of his dying fish, got more than he bargained on with a water quality report that has just come back.
George Sanderson was stunned when he received the report from a Taranaki laboratory warning the water he had sent, that was from Martinborough's town supply and came from his household tap, failed to meet drinking water standards; was "potentially harmful" without treatment and had a "high probability" of containing the dreaded Giardia bug..."
Note the point in the linked article here that mentions a contaminated aquifer.
Ever hear of Walkerton?