Most VOCs are considered health risks, and many are known carcinogens. They are all man-made chemicals.

Carbon Tetrachloride is classed by the EPA as a probably human carcinogen. The MCA is only .005 mg/l.

Treatment: Carbon tetrachloride is removed well by activated carbon filtration. Like most VOCs it is best removed by carbon with a high micropore count. Coconut shell carbon is the carbon of choice with carbon tetrachloride and other VOCs.

Reverse Osmosis is a 70% to 80% remover of carbon tetrachloride.

Source: Enting Engineering Handbook.