Layer 4: Stocks and flows
4.16. Emissions to water
Any type of material emissions to water are of interest. This will generally be related to the wastewater treatment works. At these facilities, a certain level of contaminants and materials of concern will be left and are sent out to the natural environment. Look at effluent reports from the local facilities or from government. Elements of interest include nitrogen, phosphorus, heavy metals, and other substances that may be relevant in your context. There may also be reports on dumping of waste into rivers, oceans, or other water bodies by residents or local industry.