1,1,1,2-Tetrachloroethane

Narragansett Water System-point Judith

NOTE: Narragansett Water System-point Judith purchases water from United Water Rhode Island which is required to test for 1,1,1,2-tetrachloroethane. Sample information shown below was taken by United Water Rhode Island.

1,1,1,2-Tetrachloroethane is a synthetic chemical used in metal degreasing and as an intermediate in industrial chemical production.

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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	7	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 1 ppb

The EWG Health Guideline of 1 ppb for 1,1,1,2-tetrachloroethane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-05-13	1402628-03_TO12	ND
2014-05-13	1402628-02_TO12	ND
2014-08-04	1404206-04_TO12	ND
2014-08-04	1404206-01_TO12	ND
2014-08-04	1404206-02_TO12	ND
2014-08-04	1404206-03_TO12	ND
2014-12-01	1405785-01_TO12	ND
2017-06-05	1702429-02_TO12	ND
2017-06-05	1702429-01_TO12	ND
2017-08-07	1703701-01_TO12	ND
2017-08-07	1703701-02_TO12	ND
2017-08-07	1703701-03_TO12	ND
2017-08-07	1703701-04_TO12	ND
2017-12-04	1705191-03_TO12	ND
2018-05-22	1805-10645-002_T	ND