Sewage fungus coverage

What is it? Sewage fungus is a slimy, gray/brown, smelly mat of bacteria that form fungal-shaped filaments in streams and rivers. It is commonly found in waterways polluted with high levels of nutrients and organic matter, with sewage discharges being a common source of these pollutants.

Why is it important? Sewage fungus can reduce dissolved oxygen levels, which can affect aquatic life including fish and invertebrates. It can also include pathogens that impact human health.

What does it mean? The degree of fungus coverage is an important metric for understanding the impact of outfalls and pollution on waterways.