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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of East Palo Alto

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

 

95

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND120ND
2015ND160ND
2016ND160ND
2017ND160ND
20180.105 ppb191ND - 2.00 ppb
20190.344 ppb162ND - 3.40 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
2014-04-109590-903-0800ND
2014-04-109590-902-0800ND
2014-04-109590-901-0800ND
2014-04-109590-900-0800ND
2014-07-089553-903-1418ND
2014-07-089553-902-1402ND
2014-07-089553-901-1330ND
2014-07-089553-900-1352ND
2014-10-079553-903-1030ND
2014-10-079553-902-1010ND
2014-10-079553-901-0950ND
2014-10-079553-900-0930ND
2015-01-069553-901-1025ND
2015-01-069553-902-1040ND
2015-01-069553-903-1005ND
2015-01-069553-900-0935ND
2015-04-089553-903-1035ND
2015-04-089553-902-1010ND
2015-04-089553-901-0957ND
2015-04-089553-900-0935ND
2015-07-029553-900-1000ND
2015-07-029553-901-1020ND
2015-07-029553-902-1040ND
2015-07-029553-903-1100ND
2015-10-069553-900-0845ND
2015-10-069553-901-0900ND
2015-10-069553-902-0915ND
2015-10-069553-903-0930ND
2016-01-059590-903-1030ND
2016-01-059590-900-0930ND
2016-01-059590-902-1000ND
2016-01-059590-901-0945ND
2016-04-059590-902-1100ND
2016-04-059590-903-1130ND
2016-04-059590-901-1030ND
2016-04-059590-900-1000ND
2016-07-079553-902-1045ND
2016-07-079553-903-1100ND
2016-07-079553-900-1000ND
2016-07-079553-901-1015ND
2016-10-179553-900-1000ND
2016-10-179553-901-1200ND
2016-10-179553-903-1115ND
2016-10-179553-902-1100ND
2017-01-099553-902-0930ND
2017-01-099553-901-0915ND
2017-01-099553-903-1000ND
2017-01-099553-900-0900ND
2017-04-109553-903-1150ND
2017-04-109553-902-1132ND
2017-04-109553-900-1110ND
2017-04-109553-901-1122ND
2017-07-059553-903-0950ND
2017-07-059553-902-0910ND
2017-07-059553-900-1050ND
2017-07-059553-901-1020ND
2017-10-059553-901-0907ND
2017-10-059553-902-0930ND
2017-10-059553-903-1015ND
2017-10-059553-900-0844ND
2018-02-129590-900-1126ND
2018-02-129590-903-0958ND
2018-02-129590-901-1051ND
2018-03-059590-902-0900ND
2018-05-099590-900-1317ND
2018-05-099590-902-1220ND
2018-05-099590-901-1258ND
2018-05-099590-903-12392.00 ppb
2018-05-149590-900-0942ND
2018-05-149590-901-1011ND
2018-05-149590-903-0843ND
2018-08-079590-900-1100ND
2018-08-079590-903-1030ND
2018-08-079590-901-1045ND
2018-08-079590-902-0930ND
2018-11-059590-903-0950ND
2018-11-059590-902-0900ND
2018-11-059590-901-1010ND
2018-11-059590-900-1030ND
2019-02-049590-903-1028ND
2019-02-049590-901-1121ND
2019-02-049590-902-0922ND
2019-02-049590-900-1219ND
2019-05-079590-900-0813ND
2019-05-079590-903-09213.40 ppb
2019-05-079590-902-0859ND
2019-05-079590-901-0840ND
2019-08-069590-900-0933ND
2019-08-069590-901-0905ND
2019-08-069590-903-08382.10 ppb
2019-08-069590-902-0812ND
2019-11-049590-901-1043ND
2019-11-049590-900-1130ND
2019-11-049590-903-0956ND
2019-11-049590-902-0903ND