What type of water quality issues can be caused by live iron bacteria?

Live iron bacteria primarily lead to color and odor issues in water. These bacteria oxidize dissolved iron, creating colored sediments that can impart a reddish or brownish tint to the water. Additionally, the metabolic processes of iron bacteria often produce byproducts that can produce musty or earthy odors, further affecting the water's aesthetic quality.

While live iron bacteria can contribute to increased turbidity due to the sediment they create, the primary issue tends to be related to color and odor. Excessive chlorination needs are typically associated with other contamination issues, such as pathogens or organic material, not directly with iron bacteria. Therefore, focusing on the immediate and observable impacts of iron bacteria on water quality highlights the main concerns of color and odor, making this answer the most relevant.