SARNIA is the most important centre, deriving its industrial base from large petroleum refineries and petrochemical plants. These industries reported 11 chemical spills in 1985 and the discovery of a toxic "blob" on the river's bottom resulted in a $16 000 fine to Dow Chemical Canada Inc. The river is now monitored by Ontario's ministry of the environment. The banks of the St Clair are also home to many cottagers.
Author MARIE SANDERSON