1,1,1-Trichloroethane

Red Hill Water Authority

1,1,1-Trichloroethane is a solvent and a degreasing agent used for manufacturing metal products and as ingredient in cleaners and aerosols. Exposure to 1,1,1-trichloroethane can harm the nervous system, liver and circulatory system.

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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	6	ND
2015	ND	5	ND
2016	ND	3	ND
2017	ND	9	ND
2018	ND	5	ND
2019	ND	6	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 200 ppb

The legal limit for 1,1,1-trichloroethane, established in 1987, was based on toxicity studies conducted in laboratory animals in the 1970s and 1980s.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-03-12	140010197	ND
2014-03-12	140010198	ND
2014-03-12	140010199	ND
2014-05-14	140020004	ND
2014-07-23	140032263	ND
2014-11-05	140050162	ND
2015-02-18	12402511	ND
2015-03-04	12516309	ND
2015-04-22	12633989	ND
2015-07-29	13013708	ND
2015-11-18	13515009	ND
2016-02-03	13871048	ND
2016-02-03	13871069	ND
2016-11-10	15227186	ND
2017-02-08	15656525	ND
2017-02-08	15656526	ND
2017-02-08	15656527	ND
2017-03-29	15796777	ND
2017-05-31	16095733	ND
2017-07-26	16414773	ND
2017-09-26	16727983	ND
2017-09-26	16727984	ND
2017-10-18	16881230	ND
2018-02-07	8001980-01	ND
2018-04-25	8008151-01	ND
2018-07-17	8017901-01	ND
2018-08-07	8021854-01	ND
2018-10-22	8028636-01	ND
2019-02-06	9002686-01	ND
2019-05-07	9009679-01	ND
2019-06-25	9022004-01	ND
2019-08-21	9025620-01	ND
2019-09-24	9021809-01	ND
2019-12-16	9033958-01	ND