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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Llano

Monochloroacetic 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.

MORE ABOUT THIS CONTAMINANT

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
20154.20 ppb114.20 ppb
2016ND30ND
2017ND50ND
2018ND80ND
20190.725 ppb81ND - 5.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 53 ppb

The EWG Health Guideline of 53 ppb for monochloroacetic 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.. This health guideline protects against system toxicity.

ppb = parts per billion

All test results

Date Lab ID Result
2014-08-13AC63554ND
2015-07-31AD019154.20 ppb
2016-06-07AD39594ND
2016-09-21AD50551ND
2016-11-16AD58279ND
2017-02-16AD71040ND
2017-04-19AD80165ND
2017-07-06AD88476ND
2017-10-03AD99046ND
2017-12-07AE07184ND
2018-02-06AE12464ND
2018-02-06AE12463ND
2018-04-26AE24134ND
2018-04-26AE24133ND
2018-09-17AE40243ND
2018-09-17AE40242ND
2018-11-27AE46991ND
2018-11-27AE46992ND
2019-02-07AE53456ND
2019-02-07AE53453ND
2019-04-25AE63696ND
2019-04-25AE63691ND
2019-08-05AE77003ND
2019-08-05AE77002ND
2019-10-08AE85939ND
2019-10-08AE859355.80 ppb