Why did Salem (Oregon) leaders wait 4 days to warn people about tainted tap water?

Salem officials refused Wednesday to fully explain why they waited four days to tell residents they had discovered toxins in the city's drinking water over the holiday weekend.

Cyanotoxins in Salem's water were confirmed by an out-of-state lab Saturday, but city officials didn't tell the public, or issue a do-not-drink advisory, until Tuesday afternoon.

The toxins stem from an algae bloom at Detroit Lake, where Salem and other nearby communities have gotten their water for decades. Cyanotoxins can cause allergic reactions, respiratory issues and severe illnesses such as liver and kidney damage.

https://www.statesmanjournal.com/story/news/2018/05/30/why-didnt-salem-tell-residents-tainted-tap-water-earlier/657520002/