Officials did water tests at Seech Lake, north of Oakburn, which is approximately 250 kilometres northwest of Winnipeg, roughly two weeks ago when dead water beetles and crayfish were found on the shore.

Officials do say swimming in the lake is still safe, but eating fish out of it is not.

The levels detected were below what would be considered a health concern, confirmed a provincial spokesperson on Friday.

Manufactured by Syngenta, Matador is an insecticide typically used on crops including canola, spring wheat, durum, winter wheat, barley and oats, according to the company's website.