First, I think it's a very unlikely situation that all of Lake Ontario would be contaminated as a result of a nuclear incident. On the issue of a farmer's field being contaminated because of a release stemming from a nuclear incident, that would be compensable. His lost wages, as well as the cleanup of his property, would be compensable under the proposed bill, and that's an improvement from the previous bill.
If there were concerns about the level of contamination in a source of drinking water, the damage that would be compensated would be for the measures the individual would have to take to replace that drinking water.