Chloromethane

La Crosse Waterworks

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

119

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	38	ND
2015	ND	17	ND
2016	ND	14	ND
2017	ND	20	ND
2018	ND	14	ND
2019	ND	16	ND

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
2014-02-25	4020695-01	ND
2014-03-06	4030179-02	ND
2014-03-10	4030238-01	ND
2014-03-10	4030238-02	ND
2014-04-22	4040806-16	ND
2014-06-09	201406100164AM	ND
2014-06-09	201406100207AM	ND
2014-06-09	201406100213AM	ND
2014-06-09	201406100397AM	ND
2014-06-09	201406100209AM	ND
2014-06-09	201406100167AM	ND
2014-06-10	201406110853AM	ND
2014-06-10	201406110967AM	ND
2014-06-10	201406110900AM	ND
2014-06-10	201406110898AM	ND
2014-06-10	201406110893AM	ND
2014-06-11	4060407-01	ND
2014-06-11	4060407-02	ND
2014-06-11	4060407-03	ND
2014-06-11	4060407-04	ND
2014-06-16	4060519-04	ND
2014-06-16	4060519-02	ND
2014-06-24	4060840-01	ND
2014-07-23	201407240488AM	ND
2014-08-11	4080309-01	ND
2014-08-13	4080455-02	ND
2014-08-13	4080455-03	ND
2014-10-08	4100322-07	ND
2014-12-08	201412090763AM	ND
2014-12-08	201412090775AM	ND
2014-12-08	201412090773AM	ND
2014-12-08	201412090588AM	ND
2014-12-08	201412090513AM	ND
2014-12-08	201412090769AM	ND
2014-12-08	201412090550AM	ND
2014-12-08	201412090511AM	ND
2014-12-09	201412100782AM	ND
2014-12-30	4120949-01	ND
2015-02-11	5020318-02	ND
2015-02-11	5020318-03	ND
2015-02-11	5020318-04	ND
2015-03-09	5030238-01	ND
2015-03-30	5030975-01	ND
2015-04-01	5040003-01	ND
2015-05-04	201505050286AM	ND
2015-05-06	5050178-03	ND
2015-05-06	5050178-04	ND
2015-05-06	5050178-02	ND
2015-06-16	5060564-04	ND
2015-08-13	5080540-02	ND
2015-08-13	5080540-03	ND
2015-08-13	5080540-04	ND
2015-10-14	5100472-02	ND
2015-10-14	5100472-03	ND
2015-10-14	5100472-04	ND
2016-03-10	6030418-03	ND
2016-03-10	6030418-02	ND
2016-03-10	6030418-01	ND
2016-03-10	6030418-06	ND
2016-03-10	6030418-05	ND
2016-04-14	6040500-01	ND
2016-05-18	6050700-03	ND
2016-05-18	6050700-04	ND
2016-05-18	6050700-05	ND
2016-08-10	6080456-03	ND
2016-08-10	6080456-07	ND
2016-11-03	6110193-08	ND
2016-11-03	6110193-03	ND
2016-11-03	6110193-07	ND
2017-03-08	17C0300-01	ND
2017-03-15	17C0533-01	ND
2017-03-16	17C0605-01	ND
2017-06-14	17F0575-03	ND
2017-06-14	17F0575-04	ND
2017-06-14	17F0575-08	ND
2017-06-14	17F0575-02	ND
2017-06-14	17F0575-07	ND
2017-06-14	17F0575-05	ND
2017-06-14	17F0575-06	ND
2017-06-15	17F0598-01	ND
2017-06-21	17F0857-01	ND
2017-06-21	17F0857-03	ND
2017-08-09	17H0448-02	ND
2017-08-09	17H0448-03	ND
2017-08-09	17H0448-04	ND
2017-08-09	17H0448-05	ND
2017-10-23	17J0751-02	ND
2017-10-23	17J0751-03	ND
2017-10-23	17J0751-04	ND
2018-02-28	18B0840-03	ND
2018-02-28	18B0840-04	ND
2018-02-28	18B0840-06	ND
2018-05-02	18E0103-03	ND
2018-05-02	18E0103-04	ND
2018-05-02	18E0103-05	ND
2018-05-02	18E0103-06	ND
2018-05-03	18E0132-02	ND
2018-08-01	18H0053-02	ND
2018-08-01	18H0053-03	ND
2018-08-01	18H0053-04	ND
2018-10-01	18J0009-02	ND
2018-10-01	18J0009-03	ND
2018-10-01	18J0009-04	ND
2019-03-04	19C0052-01	ND
2019-03-04	19C0052-03	ND
2019-03-05	19C0107-01	ND
2019-03-18	19C0513-02	ND
2019-06-06	19F0212-01	ND
2019-06-06	19F0212-02	ND
2019-06-06	19F0212-03	ND
2019-06-06	19F0212-05	ND
2019-07-22	19G0736-01	ND
2019-07-22	19G0736-03	ND
2019-07-22	19G0736-04	ND
2019-07-22	19G0736-06	ND
2019-10-02	19J0142-01	ND
2019-10-02	19J0142-02	ND
2019-10-02	19J0142-03	ND
2019-10-02	19J0142-04	ND