Despite the warm weather, this is not a good weekend to take a dip in the waters off Kitsilano Beach.
That's because sky-high E. coli counts have triggered a no-swimming advisory from Vancouver Coastal Health.
According to the regional health authority, two samples measured 1,515 and 12,997 E. coli per 100 millillitres, respectively.
These numbers are significantly higher than the 798 per 100 millilitres recorded over the Canada Day weekend in a single sample at Sunset Beach.
Single samples of more than 400 E. coli per 100 millilitres are sufficient to cause a warning.
Sources of E. coli contamination can include sewer overflows, discharge from boats, animal waste, and storm runoff with contaminants from other sources, including recreational vehicles.
There are also no-swimming advisories in effect at Trout Lake in East Vancouver's John Hendry Park and at Snug Cove off Bowen Island.
Vancouver Coastal Health posts signs when there is an increased risk of illness to swimmers. Seniors, infants, children, and people with reduced immunity are most vulnerable.
"The risk of getting sick is higher if you swallow water or get water in the nose, eyes, ears, or an open wound," Vancouver Coastal Health states on its website. "Examples of possible illness include stomach upset, ear infection, sore throat, or wound infection."