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Use of Aquatic Herbicides by Farmers - Regulation 63/09 of the Pesticide Act

Certified Farmers

A Certified Farmer may buy and use a Class B or C herbicide to control weeds in a pond on his/her agricultural operation.  The General Vendor must record the Certified Farmer’s Grower Pesticide Safety Course certificate number and expiry date with the record of sale.

A permit may be required for the use of pesticides in a water extermination.

Ponds Wholly Contained with No Outflow
A Certified Farmer does not need a permit to apply an aquatic herbicide to his pond if the pond is wholly contained within the boundaries of his/her property, with no outflows to another waterbody outside the boundaries of his/her property. 
NOTE:  A pond is wholly within the boundaries of a property when there is no outflow from the waterbody by any means directly or indirectly, other than by percolation, into other water or watercourse that is located wholly or partly outside the boundaries of the person's property.
                                                                                                            
Ponds Wholly Contained with Outflow
A Certified Farmer needs a permit to apply an aquatic herbicide to his/her pond if the pond is wholly contained on the property but has an outflow to a waterbody that is outside the boundaries of his/her property.