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EWG's Tap Water Database — 2019 UPDATE

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Dichloromethane (methylene chloride)

Oyster Bay Water District

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.

 

182

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND320ND
2013ND320ND
2014ND310ND
2015ND160ND
2016ND310ND
2017ND400ND

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
2012-01-041201060-001A-POCND
2012-02-071202239-001A-POCND
2012-02-291202982-001-POCSND
2012-02-291202982-005-POCSND
2012-02-291202982-002-POCSND
2012-02-291202982-004-POCSND
2012-02-291202982-003-POCSND
2012-03-061203167-001A-POCND
2012-04-10104385-001A-POCSND
2012-05-011205064-001A-POCND
2012-05-291205B26-001-POCSND
2012-05-291205B26-002-POCSND
2012-05-291205B26-005-POCSND
2012-05-291205B26-004-POCSND
2012-05-291205B26-003-POCSND
2012-06-201206845-001A-POCND
2012-07-241207B14-001A-POCND
2012-08-141208853-001A-POCND
2012-09-111209462-001A-POCND
2012-09-171209795-003-POCSND
2012-09-171209795-004-POCSND
2012-09-171209795-005-POCSND
2012-09-171209795-002-POCSND
2012-09-171209795-001-POCSND
2012-10-091210463-001A-POCND
2012-11-141211578-001A-POCND
2012-11-271211B12-004-POCSND
2012-11-271211B12-002-POCSND
2012-11-271211B12-005-POCSND
2012-11-271211B12-001-POCSND
2012-11-271211B12-003-POCSND
2012-12-171212866-001A-POCND
2013-01-151301650-001A-POCND
2013-02-121302408-001A-POCND
2013-03-051303134-004-POCSND
2013-03-051303134-005-POCSND
2013-03-051303134-001-POCSND
2013-03-051303134-002-POCSND
2013-03-051303134-003-POCSND
2013-03-271303D04-001A-POCND
2013-04-161304942-001A-POCND
2013-05-081305379-001A-POCND
2013-06-071306365-001-POCSND
2013-06-191306A33-002-POCSND
2013-06-191306A33-003-POCSND
2013-06-191306A33-004-POCSND
2013-06-191306A33-001-POCSND
2013-06-191306A33-005-POCSND
2013-07-101307477-001-POCSND
2013-08-271308E22-001-POCSND
2013-09-111309562-004-POCSND
2013-09-111309562-003-POCSND
2013-09-111309562-005-POCSND
2013-09-111309562-001-POCSND
2013-09-111309562-002-POCSND
2013-09-171309958-001-POCSND
2013-10-141310777-001-POCSND
2013-11-131311601-001-POCSND
2013-12-041312158-001-POCSND
2013-12-181312990-004-POCSND
2013-12-181312990-002-POCSND
2013-12-181312990-003-POCSND
2013-12-181312990-001-POCSND
2013-12-301312E04-001-POCSND
2014-01-211401843-001-POCSND
2014-02-111402492-001-POCSND
2014-03-051403199-001-POCSND
2014-03-181403C52-001-POCSND
2014-03-181403C52-004-POCSND
2014-03-1803C52-005-POCSND
2014-03-181403C52-003-POCSND
2014-03-181403C52-002-POCSND
2014-04-081404646-001-POCSND
2014-04-221404F72-004-POCSND
2014-04-221404F65-001ND
2014-04-221404F72-001-POCSND
2014-04-221404F72-002-POCSND
2014-04-221404F72-003-POCSND
2014-05-271405J26-001-POCSND
2014-06-171406B90-001-POCSND
2014-07-231407G76-001-POCSND
2014-08-181408B68-007-POCSND
2014-09-101409716-001-POCSND
2014-09-231409H36-004-POCSND
2014-09-231409H36-003-POCSND
2014-09-231409H36-005-POCSND
2014-09-231409H36-001-POCSND
2014-09-231409H36-002-POCSND
2014-10-301410J92-001-POCSND
2014-12-031412213-001-POCSND
2014-12-031412213-005-POCSND
2014-12-031412213-003-POCSND
2014-12-031412213-002-POCSND
2014-12-031412213-004-POCSND
2014-12-161412B34-001-POCSND
2015-01-201501A62-001-POCSND
2015-02-111502655-001-POCSND
2015-03-041503213-001-POCSND
2015-03-041503213-003-POCSND
2015-03-041503213-002-POCSND
2015-03-041503213-004-POCSND
2015-03-041503213-005-POCSND
2015-03-091503478-001-POCSND
2015-04-011504003-001-POCSND
2015-05-181505C34-001-POCSND
2015-05-201505E59-002-POCSND
2015-05-201505E59-001-POCSND
2015-05-201505E59-003-POCSND
2015-05-201505E59-004-POCSND
2015-05-201505E59-005-POCSND
2015-06-031506225-001-POCSND
2016-01-271601H95-001ND
2016-02-241502E28-001ND
2016-03-151603B65-001ND
2016-03-301603O03-003ND
2016-03-301603O03-005ND
2016-03-301603O03-004ND
2016-03-301603O03-002ND
2016-03-301603O03-001ND
2016-04-191604G74-001ND
2016-06-151606E92-004ND
2016-06-151606E92-003ND
2016-06-151606E92-005ND
2016-06-151606E92-002ND
2016-06-151606E92-001ND
2016-06-241605L69-001ND
2016-07-191607E62-001ND
2016-08-241608N05-001ND
2016-09-131609895-001-POCND
2016-09-261609L71-003-POCND
2016-09-261609L71-004-POCND
2016-09-261609L71-005-POCND
2016-09-291609L71-001-POCND
2016-09-291609L71-002-POCND
2016-10-24702735006ND
2016-11-07703821001-POCND
2016-11-21705054005ND
2016-11-21705054001ND
2016-11-21705054002ND
2016-11-21705054004ND
2016-11-21705054003ND
2016-12-19707151001ND
2017-01-18709324001-POCND
2017-02-13701114001-POCND
2017-03-207013675001-POCND
2017-03-297014366001-POCND
2017-03-297014366004ND
2017-03-297014366003-POCND
2017-03-297014366002-POCND
2017-03-297014366005-POCND
2017-04-177015995001ND
2017-06-207021777001-POCSND
2017-06-217021951010-POCND
2017-06-217021951006-POCND
2017-06-217021951002-POCND
2017-06-217021951008-POCND
2017-06-217021951004-POCND
2017-06-277022475005-POCSND
2017-06-277022475002-POCSND
2017-06-277022475001-POCSND
2017-06-277022475004-POCSND
2017-06-277022475003-POCSND
2017-07-252902844-POCSND
2017-08-227027829001-POCND
2017-09-197030333001-POCND
2017-09-277031121002-POCND
2017-09-277031121003-POCND
2017-09-277031121005-POCND
2017-09-277031121001-POCSND
2017-09-277031121004-POCND
2017-10-117032516001-POCND
2017-11-287036579001-POCND
2017-12-207038629001-POCND
2017-12-277039161001-POCND
2017-12-277039161005-POCND
2017-12-277039108001-POCND
2017-12-277039161003-POCND
2017-12-277039108004-POCND
2017-12-277039161004-POCND
2017-12-277039108002-POCND
2017-12-277039108003-POCND
2017-12-277039108005-POCND