EPA-Expo-Box (A Toolbox for Exposure Assessors)
- Fate & Transport
- Calculation Tools
Contaminants found in aquatic biota can originate from releases to air, soil, wastewater, or groundwater to surface water. Specifically, contaminants in ambient air could be deposited or washed out to aquatic systems. Erosion of contaminated soil could release chemical contaminants to surface waters. Runoff flowing along the ground surface could transfer chemical contaminants in contaminated soil to nearby waterways. Chemical contaminants in wastewater effluents could be a source of contamination to receiving water bodies near the discharge location. In addition, chemical contaminants could leach from landfilled sewage sludge into subsoil and groundwater and migrate to surface water or sediment.