Excretion is through the urine. All contamination of streams and lakes with propanil should be avoided. Propanil appears to have very low toxicity to mammals. Only information on lab animals such as rabbits, rats and dogs was found. Fungi use it as a carbon source.
Bacteria produce highly colored by-products such as tetrachloroazobenzene.
Breakdown of Chemical in Water Propanil will break down in water. Streams and lakes should not be contaminated with propanil. Breakdown of Chemical in Vegetation Within a plant, propanil is moved from the leaves to the growing shoots, then back to other leaves. It is a contact herbicide. Carry over of herbicidal activity to subsequent crops is not likely.