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EWG's Tap Water Database — 2019 UPDATE

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Dichloromethane (methylene chloride)

City of Hereford

Methylene chloride is a common industrial solvent used for paint stripping, vapor degreasing, printing, electronics manufacturing and cleaning. It causes cancer and liver damage in animal studies. Read More.

Surface and groundwater can be contaminated with methylene chloride from industrial releases and landfill leaching. The EPA considers methylene chloride likely carcinogenic to people. Long-term ingestion of drinking water with methylene chloride contamination can cause liver damage and cancer. Occupational exposure to methylene chloride and other solvents has been linked with increased risk of miscarriage. Birth defects have also been observed in studies of laboratory animals exposed to methylene chloride during pregnancy.

Click here to read more about carcinogenic VOCs.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND30ND
2014ND30ND
2015ND40ND
2016ND60ND
2017ND40ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 4 ppb

The EWG Health Guideline of 4 ppb for dichloromethane (methylene chloride) 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 dichloromethane, established in 1992, was based on analytical detection limits at the time that the standard was set.

ppb = parts per billion

All test results

Date Lab ID Result
2012-03-08AB83427ND
2012-03-08AB83425ND
2012-05-30AB91325ND
2013-05-28Q1301569015ND
2013-05-28Q1301569018ND
2013-05-28Q1301569019ND
2014-02-12Q1404321004ND
2014-02-12Q1404321014ND
2014-02-12Q1404321012ND
2015-01-29Q1503619008ND
2015-01-29Q1503619001ND
2015-01-29Q1503619003ND
2015-01-29Q1503619006ND
2016-02-10Q1605969003ND
2016-02-10Q1605969002ND
2016-03-17Q1611196004ND
2016-03-17Q1611196002ND
2016-09-15Q1637842006ND
2016-10-18Q1644175005ND
2017-01-17Q1702053006ND
2017-04-10Q1714723001ND
2017-05-09Q1718998002ND
2017-07-13Q1728901008ND