The Provincial Health Officer advises all British Columbians with compromised immune systems (such as HIV, organ or bone transplants, chemotherapy or medications that suppress the immune system) to avoid drinking water from any surface water or ground water that is under the influence of surface water, unless it has been boiled, filtered, distilled or treated with UV. Bowen Island and other areas in British Columbia use surface water sources (lakes, rivers, streams).
This is not a general boil-water advisory for the general public, but rather is directed only at people with compromised immune systems. If in doubt about your immune system status, please discuss this further with your physician.
Read more at HealthlinkBC