This document contains definitions for various terms related to water resources and water pollution including: aquifers, chlorinated hydrocarbons, inorganic fertilizers, desalination, dissolved oxygen, eutrophication, evaporation, floodplains, groundwater, natural capital, natural recharge, nondegradable pollutants, oxygen demanding wastes, point sources, primary and secondary sewage treatment, recharge areas, reliable runoff, salinity, saltwater intrusion, sedimentary rocks, septic tanks, sludge, surface runoff, water pollution, water tables, zones of aeration and saturation, and zoning regulations.