One major impediment for the development of intensive hog operations are potential impacts of ground water contamination or surface runoff in manure applied fields. Surface water samples were collected from 15 and 22 different sites in the Icelandic and Fisher River waterbeds in the interlkae region of Manitoba. Water samples were collected from target and control fields, ditches receiving runoff from fields and from the Icelandic and Fisher rivers. Nutrient concentrations were statisically different (and higher) in snow meltwater from fields with hog manure application than for fields with no manure application. Ammonia Nitrogen and phosphorus were statistically higher where the runoff entered the rivers, indicating the surrounding runoff did provide sufficient contributions to cause a increase in river concentrations.