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Orono Beach 2020 Testing Counts

Note: We are the only Sherburne County lake that tests for bacteria.
Counts below 235 MPN/100 mL are considered safe.

City of Elk River protocol for beach posting

Date North of beach (MPN/100 mL) Middle of beach (MPN/100 mL) South of beach (MPN/100 mL) Geometric mean of monthly counts
9/3/20 26.2 42.0 29.9 61.43
9/2/20 67.7 62.4 52.8 64.86
9/1/20 28.5 17.1 1119.9 54.35
8/27/20 48.8 62.4 60.5 48.46
8/25/20 27.2 41.7 54.8 47.8
8/20/20 133.3 95.8 204.6 28.08
8/18/20 36.4 33.6 31.3 30.59
8/13/20 93.3 98.4 93.3 27.40
8/11/20 25.9 31.3 18.5 24.71
8/10/20 33.6 40.2 32.3 23.46
8/6/20 111.2 1046.2 24.6 22.62
8/5/20 52.0 137.9 36.8 19.59
8/4/20 8.6 579.4 579.4 17.4
7/30/20 3.1 8.5 14.6 16.22
7/29/20 8.5 6.3 18.5 00
7/28/20 43.2 45.2 517.2 18.23
7/23/20 14.4 19.7 23.3 00
7/21/20 16.1 7.3 5.2 13.87
7/16/20 3.0 4.1 9.7 14.99
7/14/20 7.5 5.2 13.5 17.23
7/9/20 13.2 13.4 13.2 20.74
7/1/20 24.3 27.9 36.9 22.58
6/30/20 201.4 41.0 42.8 22.96
6/25/20 14.8 14.5 9.7 20.26
6/23/20 9.8 13.2 12.2 21.47
6/18/20 18.7 13.4 20.1 23.43
6/16/20 21.3 8.5 14.4 24.68
6/11/20 41.4 12.2 14.6
6/9/20 34.5 25.6 61.7
6/4/20 18.7 21.7 17.1
6/2/20 46.4 18.5 45.0
5/26/20 65.7 46.4 13.5

Counts from previous years


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