July 2020

The program under the Safe Drinking Water Act that regulates the use of wells to pump fluids into the ground. — Source: Arizona Department of… Read More »Underground Injection Control (UIC)

A cloudy condition in water due to suspended silt or organic matter. The degree of turbidity is measured with a turbidometer. — Source: Arizona Department… Read More »Turbidity

A stable, low boiling-point colorless liquid that is toxic if inhaled. Used as a solvent or metal degreasing agent and in other industrial applications. —… Read More »Trichloroethylene (TCE)

Wastewater that has been subjected to one or more physical, chemical, and biological processes to reduce its potential of being health hazard. — Source: Arizona… Read More »Treated Wastewater

A measure of the average rate of the horizontal movement of air within the mixing layer. — Source: Arizona Department of Environmental Quality

The horizontal or vertical displacement of a pollutant from its emission source that can be carried through the atmosphere over some distance. — Source: Arizona… Read More »Transport (air pollution)

Any transportation-related facility such as loading docks, parking areas, storage areas, or other similar areas where shipments of hazardous waste are temporarily held during the… Read More »Transfer Facilities

A poisonous substance that can either be natural (produced by plants, animals or bacteria) or manufactured. — Source: Arizona Department of Environmental Quality

EPA program that tracks the management of toxic chemicals that may pose a threat to human health and the environment. — Source: Arizona Department of… Read More »Toxics Release Inventory (TRI)

The degree to which a substance or mixture of substances can harm humans or animals. — Source: Arizona Department of Environmental Quality

National law, administered by the EPA, that assesses and regulates new commercial chemicals before their entrance into the market, regulates existing chemicals that pose an… Read More »Toxic Substances Control Act

A measure of the suspended solids in wastewater, effluent, or water bodies, determined by tests for total suspended non-filterable solids. — Source: Arizona Department of… Read More »Total Suspended Solids (TSS)

Measure of the concentration or mass of petroleum hydrocarbon constituents present in a given amount of soil or water. — Source: Arizona Department of Environmental… Read More »Total Petroleum Hydrocarbons (TPH)

The sum of the concentrations of all nitrogen forms in water, including ammonia (NH3), ammonium ion (NH4+), nitrite (NO2), and nitrate (NO3), and dissolved and… Read More »Total Nitrogen

A calculation of the maximum amount of a pollutant that a water body can receive and still meet water quality standards, and an allocation of… Read More »Total Maximum Daily Load (TMDL)

The total amount of mobile charged ions, including minerals, salts or metals dissolved in a given volume of water. — Source: Arizona Department of Environmental… Read More »Total Dissolved Solids (TDS)

The dose or exposure level below which a significant adverse effect is not expected. — Source: Arizona Department of Environmental Quality

A toxic chlorocarbon, widely known as “perc,” which forms a colorless liquid widely used for dry cleaning of fabrics. — Source: Arizona Department of Environmental… Read More »Tetrachloroethylene (PCE)

Advanced cleaning of wastewater that goes beyond the secondary or biological stage, removing nutrients such as phosphorus, nitrogen and suspended solids. — Source: Arizona Department… Read More »Tertiary Treatment

Residue of raw material or waste separated out during the processing of crops or mineral ores. — Source: Arizona Department of Environmental Quality