Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Also known as: Ethylene dichloride, 1,2-Ethylene dichloride, Freon 150, 1,2-DCA

What is 1,2-Dichloroethane?

1,2-DCA is a thick, colorless liquid that evaporates quickly and has a pleasant odor and sweet taste.

It's used to make vinyl chloride and as a solvent to remove grease and glue. In the home, 1,2-DCA can be found in some cleaning solvents, pesticides, glues, varnishes, and strippers. 1,2-DCA has been found in groundwater and soil near landfills and industries using large chemical quantities. When 1,2-DCA enters the environment, it can seep into the soil or evaporate into the air. It eventually may reach groundwater and contaminate local drinking water supplies.

How can I be exposed to 1,2-Dichloroethane?

Most environmental exposure to 1,2-DCA occur as a result of improper disposal.

People can be exposed to 1,2-DCA when they drink contaminated water. Garden plants do not take up 1,2-DCA when grown in contaminated soil.

1,2-DCA can pass through the skin. People can be exposed to 1,2-DCA when they touch contaminated soil, the chemical itself, or bathe in contaminated water.

People can inhale 1,2-DCA when working with products containing the chemical. If their water supply is contaminated, people may inhale the chemicals when they bathe or cook with the water.

What regulations and guidelines are available to protect people from 1,2-Dichloroethane?

The state and federal drinking water standards for 1,2-DCA are both set at 5 parts per billion (ppb). We suggest you stop drinking water that contains more than 5 ppb of 1,2-DCA. If levels of 1,2-DCA are very high in your water, you may also need to avoid washing, bathing, or using the water for other purposes.

No standards exist for regulating the amount of 1,2-DCA allowed in the air of homes. However, the Wisconsin Department of Natural Resources (DNR) has set a residential indoor air action level for 1,2-DCA at 0.23 parts per billion by volume (ppbv). The action level is considered to be protective of public health. Breathing 1,2-DCA for a lifetime at 0.23 ppbv is very unlikely to be harmful to people. If 1,2-DCA concentrations in air are above the action level, we recommend taking an action to halt exposure.

Most people can't smell 1,2-DCA until levels reach 10,000 ppbv. If you can smell the chemical, the level is too high to be safe.

The Wisconsin Department of Natural Resources regulates the amount of 1,2-DCA that can be released into outdoor ambient air by industries.

Health effects

Everyone's reaction is different

A person's reaction to chemicals depends on several things, including individual health, heredity, previous exposure to chemicals including medicines, and personal habits such as smoking or drinking. It’s also important to consider the length of exposure to the chemical, the amount of chemical exposure, and whether the chemical was inhaled, touched, or eaten.

The following symptoms may occur immediately or shortly after exposure to high levels of 1,2-DCA:

  • When levels of 1,2-DCA in the air range between 4 and 60 ppm, a person may experience irritation of the mouth, throat, lungs, and nose; nausea, vomiting, headache, and dizziness; and liver and kidney damage.
  • Eating or drinking 1,2-DCA can cause damage to the liver, lungs, or kidneys.
  • Touching the chemical may cause skin rashes

Long term exposure may lead to various effects.

  • Animal studies have shown 1,2-DCA causes stomach, lung, breast, and other types of cancer. 1,2-DCA may also cause cancer in humans.
  • Repeated exposure to 1,2-DCA can cause liver damage, kidney damage, lung injury, loss of appetite, dizziness and nervous system problems.

Testing can be done to find out whether people have been exposed to 1,2-DCA within the last 24 hours. These tests require special equipment, and the results may not predict what kinds of health effects will follow.

Medical tests of blood chemistry, kidney function, and liver function may be helpful in determining damage and establishing a baseline for later comparison.

Seek medical advice if you have any symptoms that you think may be related to chemical exposure.

Questions? Can't find what you're looking for? Email:

Last revised July 31, 2023