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EWG's Tap Water Database — 2021 UPDATE

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Dichloromethane (methylene chloride)

Colchester Commons

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND30ND
2016ND20ND
2017ND20ND
2018ND30ND
2019ND20ND

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
2014-02-19BG10471VOC1ND
2014-02-19BG10470VOC1ND
2014-04-18BG34476VOC1ND
2014-04-18BG34477VOC1ND
2014-07-29BG83659VOC1ND
2014-07-29BG83661VOC1ND
2014-10-16BH28215VOC1ND
2014-10-16BH28216VOC1ND
2015-04-24BJ07685VOC1ND
2015-04-24BJ07684VOC1ND
2015-04-24BJ07683VOC1ND
2016-03-24BK87904VOC1ND
2016-03-24BK87906VOC1ND
2017-04-07BY00694VOC1ND
2017-10-10BZ18334VOC1ND
2018-04-27CA37955VOC1ND
2018-04-27CA37956VOC1ND
2018-04-27CA37957VOC1ND
2019-10-21CE44554ND
2019-10-21CE44556ND