Which is a disadvantage of surface water?

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Surface water comes from lakes, rivers, and streams, so how much water you can get and how clean it is depend a lot on the weather and seasonal conditions. The disadvantage that stands out is that seasonal flows may be unreliable. In dry periods or droughts, water levels drop and stream flows weaken, making withdrawals harder and often requiring more storage or alternate sources to keep supply steady. In wet periods or during snowmelt, flows can surge, bringing higher turbidity and more contaminants from runoff, which also strains treatment processes. This variability in both how much water is available and what treatment is needed makes planning, buffering capacity, and maintaining consistent supply more challenging. While surface water is often easy to access and can provide large volumes, and contamination risk exists, the reliability issue tied to seasonal changes is the most direct disadvantage highlighted here.