The water supplied to 18 Garden Bay area homes is under a “do not use” warning from Vancouver Coastal Health (VCH) as of Nov. 4. Dream Valley Estates residents were notified by VCH that slightly elevated arsenic levels were detected in Sept. 28 water supply samples. Health Canada’s maximum acceptable concentration (MAC) for arsenic in drinking water is 10 parts per billion (ppb). Two of three Dream Valley samples tested at 11.3 and 11.6 ppb. One of those samples tested raw water and one was on treated water.