Which parameters would likely be limited in a discharge permit to prevent eutrophication?

The focus on preventing eutrophication in discharge permits centers around the control of nutrients that can lead to excessive growth of algae and aquatic plants. In this context, Total Nitrogen (Total N) and Total Phosphorus (Total P) are the primary parameters of concern.

Eutrophication is driven by an overabundance of nutrients, particularly phosphorus and nitrogen, in water bodies. When these nutrients are discharged in excessive amounts, they can stimulate algal blooms, leading to adverse effects on water quality, such as decreased oxygen levels, harmful algal blooms, and disruptions in aquatic ecosystems.

BOD5, while it indicates the organic matter in water that can deplete oxygen, does not directly contribute to eutrophication the way nitrogen and phosphorus do. Therefore, while it may be monitored for overall water quality, it is not the main parameter targeted for preventing eutrophication.

In summary, the parameters included in the correct response—Total N and Total P—are directly related to the processes that lead to eutrophication, which is why they are likely to be limited in a discharge permit aimed at mitigating this environmental issue.