Principles and Practice of Engineering (PE) Civil: Water Resources and Environmental (WRE) Practice Exam 2026 – All-in-One Resource to Master Your PE Exam!

Taste and odor issues in surface water are predominantly caused by algae growth and organic matter. During periods of high nutrient availability, particularly when nitrogen and phosphorus levels increase, algae can proliferate extensively. These algal blooms can release various compounds that lead to unpleasant tastes and odors in the water supply.

Algal species, such as cyanobacteria, not only affect aesthetics but can also produce toxins that pose health risks, making it essential to manage conditions that promote their growth. Additionally, organic matter, including decaying plant material, can contribute to the taste and odor by breaking down and releasing various organic compounds into the water.

While industrial waste, agricultural runoff, and municipal effluent can also contribute to water quality issues, they are less directly related to the specific taste and odor problems observed in surface water compared to the impacts of algae and organic materials. This makes algae growth and organic matter the primary culprits in such cases.