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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Arroyo Grande,Water Department

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

 

97

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.625 ppb164ND - 2.70 ppb
20150.212 ppb171ND - 3.60 ppb
20160.294 ppb162ND - 2.60 ppb
20171.11 ppb166ND - 5.60 ppb
2018ND160ND
20190.850 ppb166ND - 2.60 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
2014-02-113761-017-10132.70 ppb
2014-02-113761-015-10252.30 ppb
2014-02-113761-016-10002.50 ppb
2014-02-113761-018-09302.50 ppb
2014-05-153761-018-0950ND
2014-05-153761-017-0850ND
2014-05-153761-016-0930ND
2014-05-153761-015-0912ND
2014-08-193761-018-0945ND
2014-08-193761-017-1000ND
2014-08-193761-016-0910ND
2014-08-193761-015-1010ND
2014-11-253761-017-0930ND
2014-11-253761-016-0909ND
2014-11-253761-018-0838ND
2014-11-253761-015-1000ND
2015-02-173761-018-1105ND
2015-02-173761-017-0950ND
2015-02-173761-016-1045ND
2015-02-173761-015-1010ND
2015-05-123761-018-0855ND
2015-05-123761-017-1010ND
2015-05-123761-015-1030ND
2015-05-123761-016-0910ND
2015-08-113761-015-1023ND
2015-08-113761-018-10583.60 ppb
2015-08-113761-017-1038ND
2015-08-113761-016-0905ND
2015-08-273761-018-0930ND
2015-10-273761-016-1006ND
2015-10-273761-015-1111ND
2015-10-273761-018-0906ND
2015-10-273761-017-1037ND
2016-02-093761-016-0946ND
2016-02-093761-015-1020ND
2016-02-093761-018-0914ND
2016-02-093761-017-1003ND
2016-05-123761-016-1035ND
2016-05-123761-015-1113ND
2016-05-123761-018-1015ND
2016-05-123761-017-1103ND
2016-08-093761-018-09072.10 ppb
2016-08-093761-016-0935ND
2016-08-093761-015-1028ND
2016-08-093761-017-09572.60 ppb
2016-11-083761-017-0900ND
2016-11-083761-016-0920ND
2016-11-083761-015-0830ND
2016-11-083761-018-1010ND
2017-02-073761-017-0955ND
2017-02-073761-016-0916ND
2017-02-073761-018-0900ND
2017-02-073761-015-1012ND
2017-05-093761-016-10002.00 ppb
2017-05-093761-017-1020ND
2017-05-093761-018-0940ND
2017-05-093761-015-09052.50 ppb
2017-08-103761-016-1054ND
2017-08-103761-015-0924ND
2017-08-103761-017-11113.20 ppb
2017-08-103761-018-1014ND
2017-11-073761-018-0723ND
2017-11-073761-015-11032.20 ppb
2017-11-073761-016-07372.20 ppb
2017-11-073761-017-07545.60 ppb
2018-02-083761-018-1100ND
2018-02-083761-015-1000ND
2018-02-083761-017-0910ND
2018-02-083761-016-1030ND
2018-05-083761-018-1130ND
2018-05-083761-015-1115ND
2018-05-083761-016-1135ND
2018-05-083761-017-1115ND
2018-08-073761-016-0940ND
2018-08-073761-017-1005ND
2018-08-073761-015-1033ND
2018-08-073761-018-0919ND
2018-10-233761-018-1030ND
2018-10-233761-015-1110ND
2018-10-233761-016-1050ND
2018-10-233761-017-0925ND
2019-03-143761-018-1040ND
2019-03-143761-015-09202.10 ppb
2019-03-143761-016-0945ND
2019-03-143761-017-10152.30 ppb
2019-05-143761-018-1110ND
2019-05-143761-016-1050ND
2019-05-143761-015-1015ND
2019-05-143761-017-1030ND
2019-08-133761-016-10252.60 ppb
2019-08-133761-015-09102.00 ppb
2019-08-133761-017-08402.40 ppb
2019-08-133761-018-10452.20 ppb
2019-10-293761-017-1010ND
2019-10-293761-015-1025ND
2019-10-293761-018-0902ND
2019-10-293761-016-0919ND