Background

Bacteria indicators are measured in natural waters to assess the presence and level of fecal contamination.  Total Coliform and Escherichia Coli (E. Coli) counts are widely used in regulatory monitoring of recreational and drinking water. The Province of Ontario has set a recreation guideline of 1000 colony forming units (cfu’s) Total Coliform per 100ml water and 100 cfu’s E. Coli per 100ml water.

Drinking water guidelines are 5 cfu’s Total Coliform per 100ml water and 0 cfu’s E. Coli per 100ml water.

Water samples are collected and then analyzed using a ColiPlate assay kit. The samples are dispensed into the ColiPlate and the unit is then incubated for 24 hours at 35°C.
The ColiPlate causes Total Coliform to turn a distinctive blue colour and E. Coli to form a flourescent substance.

2005 Study Results

The lake encountered relatively low levels of Total Coliforms throughout the season except around the provincial park and Six Mile Lake Marina in late August.  E. Coli levels did not exceed the provincial guidelines but were elevated at several sampling locations.

The individual measurements are tabulated below.

2005 Bacteria Data

2005 Bacteria Data

The full report from the lake association is available below.


Six Mile Lake Water Quality Report - 2005.pdf Six Mile Lake Water Quality Report – 2005.pdf

More information is available in the Georgian Bay Association’s 2005 report for the Township of Georgian Bay.


Water Quality Monitoring Report-2005sm.pdf Water Quality Monitoring Report-2005sm.pdf

2004 Study Results

The lake encountered relatively low levels of Total Coliforms throughout the season.  E. Coli levels did not exceed the provincial guidelines for recreational waters.

The individual measurements are tabulated below.

2004 Bacteria Data

2004 Bacteria Data

More information is available in the Georgian Bay Association’s 2004 report for the Township of Georgian Bay.


Water Quality Monitoring Report-2004.pdf Water Quality Monitoring Report-2004.pdf

2002 Study Results

In general the results were in line with the 2000 study except the two boat landings improved this year.

The individual measurements are tabulated below.

2002 Bacteria Data

2002 Bacteria Data

The full report is available here. 
2002 Bacterial Results for Six Mile Lake.pdf 2002 Bacterial Results for Six Mile Lake

2000 Study Results

Results are rather favourable for the conditions in Six Mile Lake.  Most sample results are well below Provincial guidelines and indicate that even in populated bays were water circulation is poor, septic systems are working and soil runoff is minimal.  Although E.coli values should always be zero for drinking water and low for recreational usage, normal background levels for total coliforms are usually in the range of 10 to 30 coliforms per 100 mL of water.

The individual measurements are tabulated below.

2000 Bacteria Data

2000 Bacteria Data

The full report is available here. 
Bacteriological Survey of Surface Water of Six Mile Lake 2000.pdf Bacteriological Survey of Surface Water of Six Mile Lake 2000