Solids and turbidity in raw water come from urban run-off, stream-bank erosion, agricultural run-off, and ________________.

Algae contribute to solids and turbidity in raw water due to their growth in aquatic environments. When algal blooms occur, they can greatly increase the concentration of solids in the water. As algae die off and decompose, this process leads to additional organic matter in the water, further elevating turbidity levels. Algae can thrive in nutrient-rich waters, and when conditions favor their growth, they can proliferate rapidly, impacting water quality.

While other sources of solids and turbidity, such as industrial discharge, treatment sludge, and domestic sewage, can also introduce particulates into water, algae are a natural component of many water bodies that can become problematic under certain environmental conditions. Understanding the role of algae in contributing to turbidity is essential for managing and treating water resources effectively.