Unknown risk has to do with things that aren't observable, such as unknown risks to the exposed, delayed effects, new risks and risks unknown to science. Those are usually above the line. The public wants more regulation on these same areas. We also assess costs for all these things. Cost of a year of life saved by various interventions.
Toxic control is extremely expensive.
Endocrine disruptors are the classic case of chemicals that the public will call for increased regulation. They will also demand a lot of costs to meet the public s needs for feeling safe with these issues. There is a lot of regulation already in place for many of these chemicals, so regulation may not require a major change. They will also ask to see some refinement on how various public water systems deal with these chemicals. Usually you have some facts that you've heard about.