Chloromethane

Narragansett Water System-point Judith

NOTE: Narragansett Water System-point Judith purchases water from United Water Rhode Island which is required to test for chloromethane. Sample information shown below was taken by United Water Rhode Island.

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
2014	ND	9	ND
2015	N/A	0	N/A
2016	ND	3	ND
2017	ND	7	ND
2018	ND	1	ND
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
2014-05-13	1402628-02_TO12	ND
2014-05-13	1402628-03_TO12	ND
2014-08-04	1404206-03_TO12	ND
2014-08-04	1404206-02_TO12	ND
2014-08-04	1404206-01_TO12	ND
2014-08-04	1404206-04_TO12	ND
2014-11-20	00010 112014	ND
2014-11-20	00011 112014	ND
2014-12-01	1405785-01_TO12	ND
2017-06-05	1702429-01_TO12	ND
2017-06-05	1702429-02_TO12	ND
2017-08-07	1703701-04_TO12	ND
2017-08-07	1703701-03_TO12	ND
2017-08-07	1703701-02_TO12	ND
2017-08-07	1703701-01_TO12	ND
2017-12-04	1705191-03_TO12	ND
2018-05-22	1805-10645-002_T	ND