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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

Pasadena

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

 

60

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND190ND
2014N/A00N/A
2015ND110ND
2016ND10ND
2017ND120ND
2018ND170ND
2019N/A00N/A

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
2013-03-28201303280390AMND
2013-03-28201303280376AMND
2013-03-28201303280329AMND
2013-03-28201303280381AMND
2013-03-28201303280392AMND
2013-03-28201303280373AMND
2013-03-28201303280333AMND
2013-06-20201306200423AMND
2013-06-20201306200410AMND
2013-06-20201306200453AMND
2013-09-18201309190003AMND
2013-09-18201309190007AMND
2013-09-18201309190011AMND
2013-09-18201309190009AMND
2013-09-18201309190005AMND
2013-09-18201309190001AMND
2013-12-19201312190426AMND
2013-12-19201312190424AMND
2013-12-19201312190417AMND
2015-06-029590-028-0800ND
2015-06-029590-031-0800ND
2015-06-039590-018-0800ND
2015-06-099590-050-0800ND
2015-06-099590-045-0800ND
2015-06-099590-051-0800ND
2015-06-099590-047-0800ND
2015-06-099590-025-0800ND
2015-06-099590-023-0800ND
2015-06-099590-018-0800ND
2015-06-099590-001-0800ND
2016-11-019590-047-1030ND
2017-06-309588-018-0820ND
2017-10-109588-051-0902ND
2017-10-109588-050-0942ND
2017-10-109588-001-1050ND
2017-10-109588-047-0935ND
2017-10-109588-018-0905ND
2017-10-109588-045-0905ND
2017-10-109588-023-1000ND
2017-10-109588-025-1009ND
2017-10-109588-028-0925ND
2017-10-109588-031-0850ND
2017-10-109588-030-0832ND
2018-03-209588-045-1130ND
2018-03-209588-047-1055ND
2018-03-219588-030-1230ND
2018-03-219588-018-0920ND
2018-03-219588-028-1155ND
2018-03-219588-031-1250ND
2018-06-199588-030-0821ND
2018-06-199588-031-0828ND
2018-06-219588-023-0900ND
2018-06-259588-019-1225ND
2018-06-269588-028-0759ND
2018-06-269588-030-0836ND
2018-06-269588-025-1040ND
2018-06-269588-031-0814ND
2018-06-269588-051-0930ND
2018-06-269588-050-1010ND
2018-06-269588-001-0840ND