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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Great Oaks Water Company Inc.

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

 

74

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015ND280ND
2016ND150ND
2017ND70ND
2018ND20ND
2019ND150ND

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
2014-03-279590-013-1030ND
2014-05-159590-013-1115ND
2014-08-259590-007-0855ND
2014-08-259590-010-1035ND
2014-08-259590-022-1505ND
2014-08-259590-021-1545ND
2014-08-279590-013-1230ND
2015-06-23201504150045AMND
2015-06-23201504150031AMND
2015-06-23201504150040AMND
2015-06-23201504150034AMND
2015-06-23201504150044AMND
2015-06-23201504150041AMND
2015-06-23201504150043AMND
2015-06-24201504150032AMND
2015-06-24201504150033AMND
2015-06-24201504150039AMND
2015-06-24201504150037AMND
2015-06-24201504150035AMND
2015-06-24201504150036AMND
2015-06-24201504150042AMND
2015-09-229590-007-0850ND
2015-09-229590-013-1000ND
2015-12-21201510160029AMND
2015-12-21201510160022AMND
2015-12-21201510160020AMND
2015-12-21201510160019AMND
2015-12-22201510160023AMND
2015-12-22201510160025AMND
2015-12-22201510160018AMND
2015-12-22201510160031AMND
2015-12-22201510160028AMND
2015-12-22201510160027AMND
2015-12-22201510160026AMND
2015-12-22201510160030AMND
2016-05-259590-025-1415ND
2016-08-229590-004-1230ND
2016-08-229590-009-1410ND
2016-08-229590-011-1325ND
2016-08-249590-018-1315ND
2016-08-249590-023-1405ND
2016-08-249590-015-1450ND
2016-08-249590-013-1230ND
2016-08-259590-001-1205ND
2016-08-259590-002-1435ND
2016-08-259590-008-1255ND
2016-08-259590-019-1350ND
2016-09-069590-007-1400ND
2016-09-289590-025-1400ND
2016-11-029590-025-1115ND
2017-03-089590-025-0930ND
2017-04-139590-006-1000ND
2017-06-019590-010-1030ND
2017-08-309590-021-1510ND
2017-08-309590-007-1030ND
2017-08-319590-025-1440ND
2017-08-319590-022-1515ND
2018-08-299590-010-0930ND
2018-08-309590-007-0930ND
2019-08-289590-007-1120ND
2019-08-289590-006-0920ND
2019-08-289590-002-1030ND
2019-08-289590-001-1420ND
2019-08-299590-015-0850ND
2019-08-299590-018-1000ND
2019-08-299590-009-0745ND
2019-08-299590-008-1410ND
2019-08-299590-004-1310ND
2019-09-059590-025-1250ND
2019-09-059590-019-1145ND
2019-09-059590-023-1400ND
2019-09-129590-013-1430ND
2019-09-129590-011-1300ND
2019-09-129590-010-1145ND