The sewage spill that took place on the 16th of February is a possible source, but there are also private treatment plants in the area, there are septic tanks in the area, and the area is heavily used by boats.  -   Peter Johnson     Quotes
The sewage spill that took place on the 16th of February is a possible source, but there are also private treatment plants in the area, there are septic tanks in the area, and the area is heavily used by boats. Peter Johnson