Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Dichloromethane (methylene chloride)

Tempe Water Supply Corporation 1

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
2014ND30ND
2015ND60ND
2016ND40ND
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
2012-02-29AB82330ND
2012-02-29AB82328ND
2013-02-26AC11569ND
2013-02-26AC11571ND
2014-01-15AC39002ND
2014-01-15AC38994ND
2014-01-15AC38992ND
2015-02-24AC81713ND
2015-02-24AC81699ND
2015-02-24AC81709ND
2015-02-24AC81697ND
2015-09-10AD06572ND
2015-12-03AD15456ND
2016-02-25AD25795ND
2016-02-25AD25791ND
2016-02-25AD25783ND
2016-02-25AD25785ND
2017-06-01AD86432ND
2017-06-01AD86412ND
2017-06-01AD86408ND
2017-06-01AD86426ND