There is currently no known safe blood lead level. Canadian and U.S. health surveys indicate that the majority of the population has some exposure to lead. For the past five years, the average blood lead level for children 6-36 months in Trail has fallen below 3 micrograms per decilitre and the majority of children tested are below the B.C. C.D.C.’s Exposure Investigation Level (of 5 ug/dL).