Chloromethane

Jefferson County PWSD1

NOTE: Jefferson County PWSD1 purchases water from Missouri American St. Louis County & St. Charles County which is required to test for chloromethane. Sample information shown below was taken by Missouri American St. Louis County & St. Charles County.

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

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	ND	4	ND
2014	ND	5	ND
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	N/A	0	N/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
2013-02-05	21020101	ND
2013-02-05	21018301	ND
2013-02-05	21019901	ND
2013-02-06	21016401	ND
2013-02-06	21017401	ND
2013-05-09	21801001	ND
2013-05-09	21799401	ND
2013-05-09	21797501	ND
2013-05-09	21801201	ND
2013-05-09	21798501	ND
2013-08-08	23174401	ND
2013-08-08	23171901	ND
2013-08-08	23174601	ND
2013-08-08	23170901	ND
2013-08-08	23172801	ND
2013-11-05	23933501	ND
2013-11-05	23931601	ND
2013-11-06	23932601	ND
2013-11-06	23935101	ND
2013-11-06	23935301	ND
2014-07-23	AC30072	ND
2014-07-23	AC30071	ND
2014-07-23	AC30070	ND
2014-07-23	AC30069	ND
2014-07-23	AC30068	ND