Public Health Ontario has useful information on their website regarding testing, monitoring and sampling requirements for small drinking water systems. The discussion is oriented towards systems that provide drinking water to a larger group of people as opposed to simply family and friends; however, many of the same principles apply to individual cottage owners in the Bay.
Treatment Options: Small Drinking Water Systems (PHO)
There are many ways that surface water can be treated to make it safe for consumption. Public Health Ontario provides some guidance in choosing systems that can be effective. In some cases a professional water treatment specialist may be needed. There are basically two types of specialists: those who sell water treatment products and others that only specialize in assessing your water quality using scientific laboratory testing.
Bay Of Islands Community Association