In Jersey, where I live, half of the retention ponds have signs that say it is illegal to fish in or the water is dangerous (total bs). And the other half have fences and signs claiming private property (while in reality, they are public ponds). Honestly, I don't mind any of these warnings and just fish wherever I want, unless the pond is actually on somebodys property. To this day, I still haven't gotten a warning or been reported for fishing in these areas.