The Strait of Georgia is a region defined by significant rainfall in the fall and winter months. Rainfall is a powerful mobilizer of contaminated particles and the primary vector for contaminants to enter our waterways. Stormwater is not typically treated, so when rainwater washes over our roads and fields it carries motor oils, brake dust, tire particles, fertilizers, and pesticides among other contaminants into storm drains that directly flow to our waterways and coastal environments.