Thanks for the question.
We do have to provide guidance to custodians, including DND, on how to sample, where to sample and what analytical methods should be used to ensure rigorous testing is done to establish levels of concern in those areas. We also provide guidance on interpreting the results that come back, comparing them to levels of concern that we've identified.
In the case of drinking water, we'd advise on what treatment could be implemented, both domestically and community-wide, to address those concerns very much hand in hand with custodians, making sure the testing is done in a scientific and rigorous way, and then providing guidance and support on interpreting those results.