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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

California Water Service - San Carlos

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
20160.519 ppb162ND - 5.60 ppb
20170.738 ppb165ND - 2.50 ppb
20180.475 ppb163ND - 2.70 ppb
20190.981 ppb167ND - 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
2014-02-055810-902-0840ND
2014-02-055810-900-0815ND
2014-02-055810-901-0750ND
2014-02-055810-903-0900ND
2014-05-075810-903-1045ND
2014-05-075810-902-1105ND
2014-05-075810-901-0950ND
2014-05-075810-900-1015ND
2014-08-065810-903-0855ND
2014-08-065810-902-0930ND
2014-08-065810-901-0800ND
2014-08-065810-900-0830ND
2014-11-035810-902-0930ND
2014-11-035810-901-0825ND
2014-11-035810-903-1000ND
2014-11-035810-900-0855ND
2015-02-045810-903-1000ND
2015-02-045810-902-1030ND
2015-02-045810-901-1145ND
2015-02-045810-900-0910ND
2015-05-055810-903-1343ND
2015-05-055810-902-1331ND
2015-05-055810-900-1318ND
2015-05-055810-901-1355ND
2015-08-035810-900-1330ND
2015-08-035810-903-1420ND
2015-08-035810-902-1355ND
2015-08-035810-901-1300ND
2015-11-035810-901-0930ND
2015-11-035810-900-1010ND
2015-11-035810-903-1025ND
2015-11-035810-902-1050ND
2016-02-025810-901-0925ND
2016-02-025810-900-10002.70 ppb
2016-02-025810-903-1030ND
2016-02-025810-902-11005.60 ppb
2016-05-025810-901-1245ND
2016-05-025810-900-1350ND
2016-05-025810-903-1300ND
2016-05-025810-902-1320ND
2016-08-025810-903-1000ND
2016-08-025810-901-0935ND
2016-08-025810-900-1030ND
2016-08-025810-902-1045ND
2016-11-075810-903-1250ND
2016-11-075810-901-1345ND
2016-11-075810-902-1315ND
2016-11-075810-900-1235ND
2017-02-065810-902-0940ND
2017-02-065810-903-0835ND
2017-02-065810-901-0915ND
2017-02-065810-900-0815ND
2017-05-015810-902-08552.40 ppb
2017-05-015810-900-0955ND
2017-05-015810-901-1000ND
2017-05-015810-903-09102.10 ppb
2017-08-095810-900-14552.50 ppb
2017-08-095810-901-15052.40 ppb
2017-08-095810-903-14252.40 ppb
2017-08-095810-902-1440ND
2017-11-075810-903-1045ND
2017-11-075810-900-1005ND
2017-11-075810-902-1020ND
2017-11-075810-901-0930ND
2018-02-055810-903-0830ND
2018-02-055810-900-0850ND
2018-02-055810-901-0810ND
2018-02-055810-902-0910ND
2018-05-075810-901-10102.60 ppb
2018-05-075810-902-11102.30 ppb
2018-05-075810-903-1050ND
2018-05-075810-900-10402.70 ppb
2018-08-065810-901-1010ND
2018-08-065810-903-1030ND
2018-08-065810-902-1045ND
2018-08-065810-900-1020ND
2018-11-055810-901-0830ND
2018-11-055810-903-0855ND
2018-11-055810-902-0930ND
2018-11-055810-900-0915ND
2019-02-065810-900-0855ND
2019-02-065810-902-0920ND
2019-02-065810-901-0835ND
2019-02-065810-903-0905ND
2019-05-075810-900-08402.40 ppb
2019-05-075810-902-09052.30 ppb
2019-05-075810-903-0815ND
2019-05-075810-901-07572.60 ppb
2019-08-065810-903-11152.20 ppb
2019-08-065810-902-12002.20 ppb
2019-08-065810-900-11452.00 ppb
2019-08-065810-901-1050ND
2019-11-135810-903-0950ND
2019-11-135810-902-1000ND
2019-11-135810-900-09352.00 ppb
2019-11-135810-901-0915ND