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EWG's Tap Water Database — 2019 UPDATE

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Dichloromethane (methylene chloride)

Pennsylvania American Royersford

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.

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
20140.0556 ppb91ND - 0.500 ppb
2015ND100ND
2016ND40ND
2017ND50ND

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
2012-02-0816353301ND
2012-02-0816353901ND
2013-04-2321984601ND
2013-04-2321984701ND
2014-04-02253400010.500 ppb
2014-04-0225341501ND
2014-04-0325340301ND
2014-04-0325340801ND
2014-06-2525340501ND
2014-08-0626818001ND
2014-08-0626818101ND
2014-10-0627104001ND
2014-10-0627103901ND
2015-01-0812283051ND
2015-01-0812283030ND
2015-04-0912628871ND
2015-04-0912628892ND
2015-04-0912628936ND
2015-04-0912628913ND
2015-07-1313008752ND
2015-09-1613260278ND
2015-10-0613385339ND
2015-10-0613385318ND
2016-04-0514097875ND
2016-04-0514097833ND
2016-04-0514097898ND
2016-04-0514097854ND
2017-04-1115931643ND
2017-04-1115931580ND
2017-04-1115931666ND
2017-04-1115931601ND
2017-04-1115931622ND