1,1,1-Trichloroethane

Holden Water Division, DPW

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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	1.18 ppb	8	4	ND - 3.00 ppb
2015	0.925 ppb	8	4	ND - 2.20 ppb
2016	1.24 ppb	9	5	ND - 2.80 ppb
2017	0.553 ppb	8	3	ND - 1.92 ppb
2018	0.419 ppb	8	3	ND - 1.15 ppb
2019	0.228 ppb	8	2	ND - 1.10 ppb

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	Result
2014-02-18	3.00 ppb
2014-05-20	ND
2014-05-20	ND
2014-05-20	2.40 ppb
2014-05-20	ND
2014-05-20	ND
2014-08-20	1.60 ppb
2014-11-19	2.40 ppb
2015-02-18	2.20 ppb
2015-05-19	ND
2015-05-19	ND
2015-05-19	1.90 ppb
2015-05-19	ND
2015-05-19	ND
2015-08-18	1.90 ppb
2015-11-17	1.40 ppb
2016-02-02	2.80 ppb
2016-02-16	2.80 ppb
2016-05-17	1.90 ppb
2016-05-17	ND
2016-05-17	ND
2016-05-17	ND
2016-05-17	ND
2016-09-06	1.60 ppb
2016-11-15	2.09 ppb
2017-02-21	1.92 ppb
2017-05-16	ND
2017-05-16	ND
2017-05-16	1.40 ppb
2017-05-16	ND
2017-05-16	ND
2017-08-15	1.10 ppb
2017-11-21	ND
2018-02-20	ND
2018-05-15	ND
2018-05-15	ND
2018-05-15	ND
2018-05-15	ND
2018-05-15	1.10 ppb
2018-08-21	1.10 ppb
2018-11-20	1.15 ppb
2019-02-19	1.10 ppb
2019-05-21	ND
2019-05-21	ND
2019-05-21	ND
2019-05-21	ND
2019-05-21	ND
2019-08-23	ND
2019-11-19	0.720 ppb