Beach Testing

2021 Orono Beach Testing

Lake Orono is tested for E. coli bacteria (Escherichia coli) twice per week from Memorial Day through Labor Day at the public beach. This measure determines fecal contamination in the lake. Elevated bacteria levels can be harmful to humans and can occur after significant rain events when bacteria sources are washed into the lake from land.

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


Date
North
of Beach
Middle
of Beach
South
of Beach
Geometric Mean
of Monthly Counts
6/1/2112.117.130.9
6/3/217.512.050.4
6/8/21151.5517.542.0
6/9/2119.78.5240.0
6/10/2114.67.551.2
6/15/2116.114.555.6
Orno beach