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tinyURL : ktqh1083 | ID : 2752 Home   >   Water   >   Permits and Rules   >   Water Rulemaking   >   Sulfate standard and wild rice

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Minnesota’s sulfate standard to protect
wild rice

Wild rice is an important part of the ecosystems of many Minnesota lakes and streams. Wild rice is also a cultural resource to many Minnesotans, and is an important economic resource to those who harvest and market it.

Past studies have shown that wild rice is primarily found in waters with relatively low sulfate concentrations. In Minnesota, most sulfate in surface water comes naturally from soils and groundwater. But sulfate can also be in discharges from permitted facilities such as mining operations, wastewater treatment plants, and other industrial facilities.

In 1973, Minnesota adopted a water quality standard to protect wild rice — both natural stands and commercial rice fields. This 10 mg/liter sulfate upper limit protects “water used for production of wild rice during periods when the rice may be susceptible to damage by high sulfate levels.” These wild rice stands can be existing stands in a water body, or they can be previously documented stands present within a water body dating back to November 28, 1975.


Update on scientific peer review of the MPCA analysis of the Wild Rice Sulfate Standard Study

August 13-14 meeting details and registration information now available

The MPCA has now posted additional registration and meeting details for the two-day scientific peer review meeting that will take place on August 13-14, 2014 in St. Paul on its scientific peer review web page.


In-depth information



Last modified on October 07, 2014 10:42

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