Drinking Water Treatment Operator Class 1 Practice Exam

Sediment build-up in water distribution systems significantly impacts water quality by creating conditions conducive to harmful microbial growth, including pathogens. When sediment accumulates, it can serve as a reservoir for bacteria, viruses, and parasites, which may be released back into the water supply during turbulent flow or changes in pressure. This not only poses a health risk to consumers but can also compromise the overall efficiency of the distribution system by clogging pipes and leading to increased maintenance and operational costs.

In contrast, the other options do not accurately reflect the consequences of sediment accumulation. While nutrient levels and algae growth may be affected by sediment, the primary concern remains the potential for pathogen proliferation and decreased system performance. Therefore, the option correctly emphasizes the dual impact of harboring pathogens and reducing efficiency due to sediment build-up.