An unstable form of a chemical element that radioactively decays, resulting in the emission of nuclear radiation. Prolonged exposure to radionuclides increases the risk of cancer. All of the emission of nuclear radiation. Prolonged exposure to radionuclides increases the risk…

Water in its natural state, prior to any treatment for drinking. See finished water

An on-site review of the water sources, facilities, equipment, operation, and maintenance of a public water system for the purpose of evaluating the adequacy of the facilities for producing and distributing safe drinking water.

Non-enforceable federal guidelines regarding cosmetic effects (such as tooth or skin discoloration) or aesthetic effects (such as taste, odor, or color) of drinking water.

An aquifer that supplies 50 percent or more of the drinking water of an area.

Water in its natural state, prior to any treatment for drinking. See finished water.

The water that systems pump and treat from sources open to the atmosphere, such as rivers, lakes, and reservoirs.

A public water system which provides water in a place such as a gas station or campground where people do not remain for long periods of time. These systems do not have to test or treat their water for contaminants…

A required process intended to reduce the level of a contaminant in drinking water.

The cloudy appearance of water caused by the presence of tiny particles. High levels of turbidity may interfere with proper water treatment and monitoring.