Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloromethane

Bethesda WSC

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

MORE ABOUT THIS CONTAMINANT

 

111

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND360ND
20140.170 ppb41ND - 0.680 ppb
2015ND150ND
2016ND160ND
2017ND150ND
2018ND150ND
2019ND100ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2013-02-181302519-005DND
2013-02-181302519-021DND
2013-02-181302519-023DND
2013-02-181302519-001DND
2013-02-181302519-007DND
2013-02-181302519-025DND
2013-02-181302519-017DND
2013-02-181302519-015DND
2013-02-181302519-019DND
2013-02-181302519-003DND
2013-02-181302519-009DND
2013-02-181302519-013DND
2013-02-181302519-011DND
2013-02-281302519-075DND
2013-02-281302519-073DND
2013-02-281302519-077DND
2013-02-281302519-079DND
2013-05-22Q1301418001ND
2013-08-12Q1305399033ND
2013-08-12Q1305399027ND
2013-08-12Q1305399029ND
2013-08-12Q1305399007ND
2013-08-12Q1305399023ND
2013-08-13Q1305399009ND
2013-08-13Q1305399015ND
2013-08-13Q1305399013ND
2013-08-13Q1305399011ND
2013-08-13Q1305399005ND
2013-08-13Q1305399001ND
2013-08-13Q1305399025ND
2013-08-13Q1305399035ND
2013-08-13Q1305399017ND
2013-08-13Q1305399021ND
2013-10-14Q1308872003ND
2013-10-14Q1308872001ND
2013-11-14Q1313379001ND
2014-11-19Q1456730013ND
2014-11-19Q1456730015ND
2014-11-19Q14567300170.680 ppb
2014-11-19Q1456730019ND
2015-02-03Q1504044002ND
2015-04-22Q1515039035ND
2015-04-22Q1515039037ND
2015-04-22Q1515039040ND
2015-04-22Q1515039041ND
2015-04-22Q1515039043ND
2015-04-22Q1515039046ND
2015-04-22Q1515039025ND
2015-04-22Q1515039028ND
2015-04-22Q1515039030ND
2015-04-22Q1515039032ND
2015-04-22Q1515039034ND
2015-06-17Q1522842001ND
2015-08-04Q1530233001ND
2015-08-04Q1530233004ND
2016-02-17Q1607184002ND
2016-02-17Q1607184003ND
2016-03-21Q1611365004ND
2016-04-20Q1615721002ND
2016-04-20Q1615721003ND
2016-04-20Q1615721005ND
2016-06-16Q1624597001ND
2016-10-20Q1644787004ND
2016-10-20Q1644787010ND
2016-10-20Q1644787006ND
2016-10-20Q1644787012ND
2016-10-20Q1644787007ND
2016-11-08Q1648213030ND
2016-11-08Q1648213032ND
2016-11-08Q1648213035ND
2016-11-08Q1648213036ND
2017-01-31Q1704122013ND
2017-01-31Q1704122015ND
2017-10-17Q1753293035ND
2017-10-17Q1753293001ND
2017-10-17Q1753293037ND
2017-10-17Q1753293033ND
2017-10-17Q1753293039ND
2017-10-17Q1753293030ND
2017-11-01Q1756223020ND
2017-11-01Q1756223022ND
2017-11-01Q1756223002ND
2017-11-01Q1756223023ND
2017-11-01Q1756223014ND
2017-11-01Q1756223042ND
2017-11-01Q1756223025ND
2018-02-21Q1807322004ND
2018-05-16Q1819957002ND
2018-05-16Q1819957003ND
2018-05-16Q1819957005ND
2018-05-16Q1819957008ND
2018-05-16Q1819957010ND
2018-05-16Q1819957011ND
2018-05-16Q1819957014ND
2018-05-16Q1819957015ND
2018-05-16Q1819957017ND
2018-10-19Q1842052014ND
2018-10-19Q1842052015ND
2018-10-19Q1842052017ND
2018-10-19Q1842052020ND
2018-10-19Q1842052022ND
2019-01-15Q1901990002ND
2019-01-15Q1901990003ND
2019-01-15Q1901990005ND
2019-04-11Q1914886003ND
2019-04-11Q1914886004ND
2019-04-11Q1914886007ND
2019-04-11Q1914886008ND
2019-04-11Q1914886010ND
2019-04-11Q1914886012ND
2019-10-07Q1971784007ND