This document defines total soluble solids and total suspended solids and discusses their significance. Total soluble solids refers to materials that are completely dissolved in water and filterable, as well as the residue left after evaporating a filtered sample. They are useful for determining water quality for drinking, agriculture, and industry. High soluble solid levels can negatively impact taste, odor, dissolved oxygen levels, and corrosion. Total suspended solids refers to materials that are not dissolved in water and non-filterable, as well as the residue of a non-filtered evaporated sample. Suspended solids are aesthetically displeasing and can harbor chemical and biological agents while depleting dissolved oxygen levels.