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Orono Beach 2019 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 weekly counts Geometric mean of monthly counts
8/27/19 38.9 22.8 18.5 47.53
8/22/19 33.1 12.1 14.4 50.39
8/20/19 45.7 19.9 18.7 65.17
8/15/19 127.4 61.6 91.0 93.3
8/13/19 18.5 17.1 31.8 83.66
8/8/19 29.2 15.8 26.2 93.39
8/6/19 160.7 30.5 31.8 107.2
8/1/19 57.1 86.5 35.9 110.8
7/30/19 68.3 63.1 261.3 120.4
7/29/19 128.1 116.9 133.4 121.9
7/25/19 80.1 1119.9 28.1 110.12
7/23/19 32.3 24.6 127.4 105.6
7/22/19 28.8 43.7 113.7 113.7
7/17/19 980.4 325.5 209.8 76.28
7/16/19 96.0 218.7 292.4 80.24
7/11/19 93.3 35.0 42.6 55.28
7/9/19 129.1 101.7 118.7 50.03
7/2/19 96.0 47.9 83.3 41.33
7/1/19 118.7 488.4 31.8 38.82
6/27/19 209.8 95.8 224.7 40.76
6/26/19 209.8 95.8 224.7 40.76
6/24/19 29.5 49.6 35.0 35.43
6/20/19 275.5 40.4 50.4 54.5
6/18/19 17.1 23.1 54.5 54.5
6/13/19 5.2 11.9 12.1 32.29 32.29
6/11/19 21.1 31.8 88.0 39.89 39.89
6/6/19 23.1 18.7 16.1 40.08
6/4/19 13.4 13.4 28.2 48.25
5/30/19 45.0 39.5 36.9 68.09
5/28/19 101.2 107.6 129.6 0
5/23/19 45.0 39.5 36.9 0

Counts from previous years


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