Which type of water source is not typically subject to seasonal variations in quality?

Groundwater is generally less susceptible to seasonal variations in quality compared to surface water sources. This stability stems from the fact that groundwater resides below the earth’s surface and is often filtered through soil and rock, providing a natural barrier against contamination.

During different seasons, factors such as rainfall or temperature changes can significantly impact surface water sources like rivers, lakes, and reservoirs. For instance, heavy rainfall can lead to runoff that introduces pollutants into these bodies of water, while evaporation during dry spells can concentrate contaminants. Conversely, groundwater remains relatively insulated from these seasonal effects, helping to maintain consistent quality throughout the year.

This characteristic makes groundwater a reliable source for potable water, especially in areas prone to fluctuations in weather conditions that affect surface water supplies.