EWG's Tap Water Database — 2019 UPDATE



Cone Delfred Subdivision

1,2-Dichloroethane is a volatile carcinogenic chemical used to make plastic products such as polyvinyl chloride. Read More.

Also known as ethylene dichloride, it has been widely used as an intermediate for manufacturing other chemicals and as a solvent. 1,2-Dichloroethane causes multiple types of cancer in animal studies, and damages liver, kidneys, and the immune and nervous systems. The EPA classifies 1,2-dichloroethane as a probable human carcinogen.

Click here to read more about carcinogenic VOCs.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20120.813 ppb440.640 ppb - 0.920 ppb
20130.690 ppb43ND - 1.04 ppb
20140.500 ppb110.500 ppb
20150.570 ppb110.570 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for 1,2-dichloroethane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 5 ppb

The legal limit for 1,2-dichloroethane, established in 1987, was based on analytical detection limits at the time that the standard was set. This limit may not fully protect against the risk of cancer due to 1,2-dichloroethane exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2012-03-23120323005-0010.820 ppb
2012-06-13120614051-0010.870 ppb
2012-09-19120920006-0010.640 ppb
2012-12-12121213004-0010.920 ppb
2013-06-11130613015-0011.04 ppb
2013-09-18V130919037-0010.830 ppb
2013-12-1113122069-0010.890 ppb
2014-09-23140924006-0010.500 ppb
2015-08-26150827033-0010.570 ppb