UPDATE: The Salem water advisory remains in place Thursday. Water samples taken on Monday showed cyanotoxins above the federal health guidelines, the city of Salem said Thursday. Water samples taken on Tuesday, however, showed cyanotoxin levels below the guidelines. The city extended the drinking water advisory on June 10 for at least two weeks to reduce confusion among residents.

Salem officials sought to reassure people on Sunday the city's water is safe to drink. They announced the latest test results show toxins are below the level that would trigger a federal advisory.

Water samples taken on Friday still contained cyanotoxin from blue-green algae blooms in Detroit Lake, a reservoir on the Santiam River that is the city's water source, according to a city press release.

On June 10, the city announced it would extend its drinking water advisory warning certain people against drinking the water for at least two weeks, even though toxins were already below the amount at which the EPA would require an advisory.

The city reiterated on Sunday that the water is safe for most people to drink and the precautionary water advisory is only for "vulnerable populations."

Levels of cyanotoxins found in the latest tests were again below the EPA advisory level.

People whom the city is warning against drinking the water include:

Children under the age of six

People with compromised immune systems or pre-existing liver conditions

People receiving dialysis treatment

Pregnant women or nursing mothers

The elderly

The city is also discouraging people from allowing pets to drink the water.

People who can't drink city water can bring their own containers to filling stations that are still operating around the clock. Information about the locations is available at the city's website, cityofsalem.net.