The accumulation of substances, such as pesticides, or other organic chemicals in an organism.

The concentration of toxins in an organism as a result of its ingesting other plants or animals in which the toxins are more widely disbursed.

A graph that shows the relationship between the size of a dose and the response it produces.

The lethal dose of a substance that kills 50% of a test population.

The effective dose of a substance that produces a specific effect in 50% of a test population.

Chemicals that interfere with the endocrine system, causing adverse developmental, reproductive, neurological, and immune effects.

Excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.

Microorganisms, such as bacteria, viruses, fungi, and protozoa, that can cause disease in humans.

Pollution that comes from a single, identifiable source.

Pollution that comes from diffuse sources.

Toxic chemicals that persist in the environment, bioaccumulate in organisms, and can travel long distances.

The discharge of heated water into a body of water, reducing oxygen levels and harming aquatic organisms.

Primary treatment (physical removal of solids), secondary treatment (biological breakdown of organic matter), and tertiary treatment (advanced removal of specific pollutants).

Collection, sorting, processing, and manufacturing into new products.

It governs the "cradle-to-grave" disposal of hazardous materials.

Also known as "Superfund," it provides for the cleanup of abandoned toxic waste sites.

It makes it unlawful to discharge waste into waterways without a permit.

The EPA sets health standards for drinking water sources.

Carcinogens that cause reasonable harm cannot be added to food or drugs.