Escherichia Coli Bacteria Levels on the Big Sioux River Watershed in Sioux Falls

Escherichia Coli Bacteria Levels on the Big Sioux River Watershed in Sioux Falls:
The Big Sioux River has a designated use for Immersion Recreation. The State of SD has established the following E. Coli bacteria criteria to protect these water bodies for their designated use.

  • ≤ 235 colonies/100 mL (Daily Limit)
  • ≤126 colonies/100 mL (30 Day Geometric Mean)

If the Big Sioux River exceed these water quality criteria then the water quality is not good enough for this designated use. For example, elevated levels of E. Coli bacteria may be a health concern to the public if they use these waters for swimming.

Click on the  symbol of the corresponding monitoring location to view most recent month’s data for E. Coli.

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