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Monitoring Results in Spring Lake after Alum Treatment

Posted by PLSLWD Staff - September 8, 2014 - Completed Projects, News, Monitoring, Spring Lake Alum Treatment

Revised October 13, 2014

The Prior Lake – Spring Lake Watershed District (PLSLWD) treated Spring Lake with Aluminum Sulfate (Alum) in October of 2013.  The graphs below summarize sample results that have been taken since 2004, by the Three Rivers Park District.  Two to Three samples are taken each month (during ice-free conditions), and the average monthly concentrations are displayed below (each graph represents one month).  The red bar indicates the samples were taken after the Alum Treatment.

Water quality standards for Total Phosphorus on Spring Lake are currently held at 40 µg/L.  However, the PLSLWD is submitting a request to the MPCA to raise the standard to 60 µg/L (which makes the standard less strict) based off of research that indicated Total Phosphorus on Spring Lake has never been as low as the current water quality standard.  See 2013 Pre-settlement Water Quality and Algal Change in Spring Lake for a summary of this research, or 2013 Historical Water Quality and Ecological Change in Spring Lake for a full report.

So far, the results are very encouraging; however, the flood likely has impacted the results in June and July.

May
June
July
TP August
TP September

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Prior Lake – Spring Lake Watershed District

The District covers about 42 square miles in Scott County, MN. Water in the PLSLWD flows mainly from the southwest to the northeast through Spring, Upper Prior and Lower Prior Lakes, and then north through the Prior Lake Outlet Channel to the Minnesota River near Valley Fair amusement park.
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Prior Lake - Spring Lake Watershed District
4646 Dakota Street SE
Prior Lake, MN 55372

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