A "Boil Water Notice" Usually Means That

A "boil water notice" usually means that:

A) boiling water should be used to sterilize contaminated instruments.
B) the water should not be consumed or it should be boiled before use.
C) the local water treatment plant has a problem and will boil all water before it is sent out to the city.
D) you are not to boil the water because toxic materials got through the water treatment plant, and boiling the water will release these potentially harmful substances in the water vapor.