Sometimes there is NO sign of danger if it will hurt the one major money maker: tourism
I.E.. A few years ago Mayor Mufi of Honolulu Hawai'i allowed tons of raw sewage to go to the Waikiki beaches for three days.
A guy died of the worst horrible death from being thrown in - total whole body failure that blew up his body unrecogniziable.
BTW - Honoluolu has no law, just an memorandum of understanding that says no ship to dump sewage withing 3 miles of shore - but I promise you, in high tide the Ala Moana Beach becomes a cesspool that you can smell.
When I lived there I only went during low-tide when the toilet bowl is flushed out. I had so many skin infections - which never happened again living in AZ.