Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

East Rio Hondo Water Supply Corporation Arroyo City

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND40ND
2016ND40ND
2017ND40ND
20180.500 ppb41ND - 2.00 ppb
20191.98 ppb42ND - 5.70 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
2014-03-06AC45982ND
2014-06-06AC56224ND
2014-09-09AC66275ND
2014-11-20AC72684ND
2015-03-18AC85010ND
2015-06-17AC96370ND
2015-09-23AD08238ND
2015-12-01AD14919ND
2016-02-25AD25736ND
2016-05-17AD37043ND
2016-09-27AD51503ND
2016-12-09AD61659ND
2017-03-03AD73423ND
2017-05-19AD85047ND
2017-09-07AD95140ND
2017-11-30AE06335ND
2018-03-07AE17261ND
2018-06-05AE28682ND
2018-08-28AE386872.00 ppb
2018-11-29AE47396ND
2019-02-19AE55037ND
2019-06-18AE71301ND
2019-07-18AE750352.20 ppb
2019-11-26AE905955.70 ppb