The ecotoxicity in water category aggregates all toxic emissions potentially impacting the environment into units of m3 water. With a ±15% change in each component of the waste, the variation in outcome for Case 1 is between 6% more and 3% less saving, and in Case 2 between 4% more and 4% less savings than the reference scenario. The replacement of electricity from the heat produced in the incinerator is the main contributor to the saved impact. The changes in impact are therefore relative small for all scenarios in both cases.