Firewater's main association with pollution is its ability to rapidly spread hazardous substances if not correctly contained following use for firefighting; firewater run-off is often the culprit in or a main contributor to many chemical spill pollution events (see Water pollution). The Sandoz chemical spill of 1986, for example, turned the Rhine river red with pollutants and affected much of the wildlife due to faulty containment of the firewater used in treating an agrochemical warehouse fire, releasing 30 tonnes of toxic chemicals into the river.