Wild Rice Sulfate Standards in Minnesota

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Presentation transcript:

Wild Rice Sulfate Standards in Minnesota Our Mission: Protect and improve the environment and enhance human health April 13, 2016

Why is it important to protect wild rice? Cultural spiritual, economic significance Minnesota’s state grain Sensitive to sulfate

Wild rice is sensitive to sulfate pollution

Sources of sulfate in wild rice waters Natural sources: driven by geology Can be elevated due to: Sulfate-rich source waters Runoff Industrial processes Municipal wastewater Concentration by water treatment

The sulfate-sulfide relationship depends on iron and organic carbon

Where is wild rice grown in Minnesota?

State statute protects “wild rice waters” Self-perpetuating population Wild rice currently present, or has been present since 1975 8,000 stems over the surface of a lake, wetland, or reservoir 800 stems over a river-mile reach

Minnesota’s taconite industry and the sulfate standard

Proposed solution: a variable sulfate standard Sulfate = 0.0000136 x Organic Carbon-1.410 x Iron1.956

Learn more about Minnesota’s wild rice sulfate standard: www.pca.state.mn.us/wildrice