The independent research performed under the supervision of the Minnesota Pollution Control Agency (MPCA) and the Wild Rice Advisory Committee supports keeping the existing 10 milligrams per liter limit on sulfate in wild rice waters, if not making the standard more stringent. Studies lend no support for an MPCA interpretation that the standard should only apply “seasonally,” allowing sulfate dumping during the fall, winter and spring. Relationships between iron, sulfide formation and the phosphorus cycle that causes eutrophication and algae blooms need further study.

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