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

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

Measure of the concentration or mass of petroleum hydrocarbon constituents present in a given amount of soil or water. — Source: Arizona Department of Environmental

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

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

The total amount of mobile charged ions, including minerals, salts or metals dissolved in a given volume of water. — Source: Arizona Department of Environmental

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

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

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

The runoff of irrigation water from the lower end of an irrigated field. — Source: Arizona Department of Environmental Quality

Development using land or energy sources in a way that meets the needs of people today without reducing the ability of future generations to meet

A panel fixed to the roof of a building that uses special cells to collect energy from the sun and convert it to electricity to

Air pollution consisting of smoke and fog, which occurs in large urban and industrial areas and is mainly caused by the action of sunlight on

A resource that can be used again and again without reducing its supply because it is constantly topped up, for example wind or sun rays.

Energy from renewable resources such as wind power, solar energy or biomass — Source: Environmental Protection Agency

The process of planting trees in forest lands to replace those that have been cut down. — Source: Environmental Protection Agency

A form of energy that is transmitted in waves, rays or particles from a natural source, such as the sun and the ground, or an

A general term for any chemicals that are used to kill weeds, fungi, insects or other pests — Source: Environmental Protection Agency