Water quality is important to support a variety of aquatic life and for human consumption. Water quality is evaluated by measuring indicators such as levels of dissolved oxygen, pH, turbidity and the presence of other dissolved substances. Substances such as heavy metals (e.g., lead and aluminum), sulfur, fertilizers, and road salt are pollutants that may be dissolved in surface water or ground water, making the water unhealthy.
Water moving across and through earth materials carries with it the products of human activities.
Most precipitation that falls on Connecticut eventually reaches Long Island Sound.