Trichloroacetic acid

Montgomery County Municipal Utility District 141

NOTE: Montgomery County Municipal Utility District 141 purchases water from Lake Windcrest Water System which is required to test for trichloroacetic acid. Sample information shown below was taken by Lake Windcrest Water System.

Trichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

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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	1	ND
2015	ND	1	ND
2016	ND	1	ND
2017	ND	1	ND
2018	ND	1	ND
2019	ND	1	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic acid was proposed in 2020 by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk.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
2014-06-26	AC58337	ND
2015-09-01	AD05135	ND
2016-07-06	AD43124	ND
2017-07-27	AD91047	ND
2018-07-25	AE34496	ND
2019-07-16	AE74588	ND