ANSWER | RATING |
A | low risk |
---|---|
B | medium risk |
C | high risk |
The risk being evaluated is the risk of contaminating your local water supply - though you can consider it to be a more general indication of the health and environmental risk posed by the described behavior.
A high risk rating does not necessarily mean that your water, environment, or health have been put in jeopardy BUT a high risk rating should cause you to rethink your current ways of doing things.
Try and modify your behavior so as to have as many "low risk" scores ("A"s) as possible.