water-bearing geological formation that will yield water to a well or spring; aquifers can be classified as confined or unconfined.

surface area that drains into a surface water system.

Stormwater BMPs are control measures taken to mitigate changes to both quantity and quality of urban runoff caused through changes to land use. Generally BMPs focus on water quality problems caused by increased impervious surfaces from land development. BMPs are designed to reduce stormwater volume, peak flows, and/or nonpoint source pollution thro [..]

appearing in liquid and solid forms (crystalline) chlorinated benzenes impact soil, groundwater and sediment when released in large volumes and have the potential to persist in the environment when in solid form. These are a specific group of VOC contaminants.

This class of pesticides is bioaccumulative in the body, persistent in the environment and has the use has been banned in the US

used as insecticide this complex compound is classed as a PBT due to its ability to persist even after long-distance transport

any element, substance, compound, mixture, or agent, other than a hazardous substance, which, after release from a facility and upon exposure of, ingestion, inhalation, or assimilation into any organism, wither directly from the environment or indirectly by ingestion, inhalation, or assimilation into any organism, either directly from the environme [..]

Combined sewer systems are sewers that are designed to collect rainwater runoff, domestic sewage, and industrial wastewater in the same pipe. Most of the time, combined sewer systems transport all of their wastewater to a sewage treatment plant, where it is treated and then discharged to a water body. During periods of heavy rainfall or snowmelt, h [..]

This is a class of unintended by-product contaminants that are produced when products like herbicides are produced or when items are heated or burned. Dioxins and Furans are PBTs that are found in the air, soil and sediment.

enrichment of natural waters with inorganic material, especially nitrogen and phosphorus, such that they support excessive growth of plants/algae.