Major Contaminants

Glossary


Radioactive Isotopes

Cesium-137

Strontium-90

Technetium-99

Tritium

Uranium-238

Iodine-129

Toxic Chemicals

Carbon Tetrachloride

Chromium VI

Nitrates

Trichloroethylene


Radioactive Isotopes

Cesium-137

Description

Health Concerns

Exposure Levels

EPA has established a maximum contaminant level of 4 millirem per year for beta particle and photon radioactivity from man-made radionuclide's in drinking water. Cesium-137 would be covered under this MCL. The average concentration of cesium-137 which is assumed to yield 4 mrem/year is 200 picocuries per liter. If other radionuclide's which emit beta particles and photon radioactivity are present, the sum of the annual dose from all the radionuclide's must not exceed 4 mrem/year.

Strontium-90

Description

Health Concerns

Exposure Levels
Exposure to strontium-90, as to all radionuclide's, results in increased risk of cancer. EPA has established a maximum contaminant level of 4 millirem per year for beta particle and photon radioactivity from man-made radionuclide's in drinking water. Strontium-90 would be covered under this MCL. The average concentration of strontium-90 which is assumed to yield 4 mrem/year is 8 picocuries per liter. If other radionuclide's which emit beta particles and photon radioactivity are present, the sum of the annual dose from all the radionuclide's must not exceed 4 mrem/year.

Technetium-99

Description

Health Concerns

Exposure Levels
Exposure to technetium-99, as to all radionuclide's, results in increased risk of cancer. EPA has established a maximum contaminant level of 4 millirem per year for beta particle and photon radioactivity from man-made radionuclide's in drinking water. Technetium-99 would be covered under this MCL. The average concentration of technetium-99 which is assumed to yield 4 mrem/year is 900 picocuries per liter. If other radionuclide's which emit beta particles and photon radioactivity are present, the sum of the annual dose from all the radionuclide's must not exceed 4 mrem/year.

Tritium

Description

Health Concerns

Exposure Levels

Uranium-238

Description

Health Concerns

Exposure Levels

Iodine-129

Description

Health Concerns

Exposure Levels

Toxic Chemicals

Carbon tetrachloride

Description

Health Concerns

Exposure Levels

Chromium VI

Description

Health Concerns

Exposure Levels

Nitrates

Description

Health Concerns

Exposure Levels

Trichloroethylene

Description

Health Concerns

Exposure Levels

Glossary