Yes, please do, because this
Is dead on. I am also a trained responder and will back up the fact that a chlorine leak that is big enough to kill full grown, large fish, would indeed require an evacuation. Also, the EPA and WEF are notified of every chlorine spill, regardless of size, if it is released to the environment. Nothing reported from your city/town on either site.
But you took pics so posting them will easily prove us naysayers wrong.