The most significant threat to the health of the Chesapeake Bay is nutrient overenrichment. When present in excessive amounts, nutrients trigger algal blooms. The algae prevents sunlight from passing through the water column.
Aquatic plants suffer as a result.
Raw or poorly treated sewage also contains harmful bacteria which is a potential source of disease transmission to swimmers and other who come into contact with contaminate waters. Also, human consumption of shellfish contaminated with sewage can result in serious illness. Use onshore restrooms when docked. Choose enzyme-based deodorizers for waste in holding tanks or portable toilets. These products may disrupt sewage treatment plants.