Anne Loefler, a veteran at the Grand River Conservation Authority, is raising concerns about soil erosion from the 170-acre farm the Waterloo Region bought, reportedly for a new Toyota plant.
It is seeking 770 acres, but has yet to buy more than the one farm and a couple of residences.
Loeffler said she wrote to the Waterloo Region to report the soil erosion into two catchbasins that drain water into a stream leading to the Nith River.
Loeffler said she received no response after raising concerns that downstream water quality is threatened.
The Narwhal reported in February that the land assembly is for Toyota which has car assembly plants in Cambridge and Woodstock.