On OfferUp.com, a website where people can buy and sell items, residents have posted bottled water and fresh water in Salem and the surrounding areas.
Some of the packs of bottled water have already sold.
Bottled water is in high demand after the city of Salem said children, infants, pregnant mothers, those with compromised immune systems, other vulnerable people and pets should not drink the tap water Tuesday.
Recent tests found low levels of cyanotoxins in the water.
The advisory comes just days after the Oregon Health Authority detected toxic blue-green algae in Detroit Lake.
Detroit Reservoir is the city’s source of water.
After the water advisory was issued Tuesday, bottled water sold quickly at local stores.
"The water is gone.
The shelves were pretty empty.
They’ve got sparkling water left and some flavored water," said Sariah Fredrickson, who went to purchase water for her 2-year-old daughter.