re: Safe to eat catfish caught in the Mississippi River at BR south of Exxon?

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Yeah, I didn't believe it at first, either.

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If they are treating it for cooling water or to add to the process they are likely putting chemicals into it that DEQ/EPA don't want in the water. Organics and such get high scrutiny. Taking water out and returning it (such as once through cooling water) will never result in it being too polluted and needing treatment. Every site is different, so maybe there is some crazy situation.

If the river water is being used at the point it needs to be treated coming across the levee then it gets expensive and will probably have to be treated leaving to make sure it meets regulations. Yes, they want the water cleaner going back in the river than it came out, doesn't mean the river is polluted.