By advice of the Louisiana Department of Environmental Quality: Our pond/lake is classified a "Storm water runoff and detention".   -  This means the water should be considered polluted and can contain oil, grease, metals and coolants from vehicles; fertilizers, pesticides and other chemicals from gardens and homes; bacteria from pet wastes and failing septic systems; soaps from car or equipment washing; and accidental spills, leaky storage containers, tobacco spit and whatever else ends up on the ground.

Basically this is acceptable for a runoff water and a detention pond but they recommend and advise against the consumption of any fish caught from these waters.