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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Stanford University

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

 

183

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
20160.469 ppb162ND - 4.00 ppb
20170.162 ppb392ND - 4.00 ppb
20180.273 ppb485ND - 3.60 ppb
20190.656 ppb4810ND - 4.00 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
2014-03-051610-900-1045ND
2014-03-051610-901-0755ND
2014-03-051610-902-0815ND
2014-03-051610-903-0900ND
2014-06-041610-900-0825ND
2014-06-041610-901-0640ND
2014-06-041610-902-0835ND
2014-06-041610-903-0730ND
2014-09-101610-900-0805ND
2014-09-101610-901-0600ND
2014-09-101610-902-0820ND
2014-09-101610-903-0615ND
2014-12-031610-900-1310ND
2014-12-031610-901-1045ND
2014-12-031610-902-1100ND
2014-12-031610-903-1150ND
2015-03-111610-900-0855ND
2015-03-111610-901-0900ND
2015-03-111610-902-1005ND
2015-03-111610-903-1020ND
2015-06-031610-900-1300ND
2015-06-031610-901-0900ND
2015-06-031610-902-0915ND
2015-06-031610-903-1005ND
2015-09-021610-900-1036ND
2015-09-021610-901-0810ND
2015-09-021610-902-0745ND
2015-09-021610-903-0908ND
2015-12-161610-900-1145ND
2015-12-161610-901-0935ND
2015-12-161610-902-0915ND
2015-12-161610-903-1025ND
2016-02-101610-900-1050ND
2016-02-101610-901-08353.50 ppb
2016-02-101610-902-0910ND
2016-02-101610-903-08404.00 ppb
2016-06-011610-900-1050ND
2016-06-011610-901-0905ND
2016-06-011610-902-1150ND
2016-06-011610-903-1120ND
2016-09-071610-900-1130ND
2016-09-071610-901-0935ND
2016-09-071610-902-1000ND
2016-09-071610-903-1045ND
2016-12-141610-900-1200ND
2016-12-141610-901-0950ND
2016-12-141610-902-1020ND
2016-12-141610-903-0000ND
2017-03-011610-900-1050ND
2017-03-011610-901-0855ND
2017-03-011610-902-0915ND
2017-03-011610-903-1145ND
2017-04-051610-900-1145ND
2017-04-051610-901-0850ND
2017-04-051610-902-0915ND
2017-04-051610-903-09404.00 ppb
2017-05-031610-900-1130ND
2017-05-031610-901-0915ND
2017-05-031610-902-0935ND
2017-05-031610-903-0955ND
2017-06-071610-900-0000ND
2017-06-071610-901-0000ND
2017-06-071610-902-0000ND
2017-06-071610-903-0905ND
2017-07-051610-900-1225ND
2017-07-051610-901-0930ND
2017-07-051610-902-1015ND
2017-07-051610-903-10102.30 ppb
2017-08-021610-900-1155ND
2017-08-021610-901-0930ND
2017-08-021610-902-1000ND
2017-08-021610-903-1030ND
2017-09-061610-901-0950ND
2017-09-061610-902-0915ND
2017-09-061610-903-0950ND
2017-10-041610-900-1110ND
2017-10-041610-901-0835ND
2017-10-041610-902-0855ND
2017-10-041610-903-1130ND
2017-11-011610-900-1045ND
2017-11-011610-901-0830ND
2017-11-011610-902-0840ND
2017-11-011610-903-0940ND
2017-12-061610-900-1125ND
2017-12-061610-901-0945ND
2017-12-061610-902-1200ND
2017-12-061610-903-0955ND
2018-01-171610-900-1135ND
2018-01-171610-901-0935ND
2018-01-171610-902-0955ND
2018-01-171610-903-1030ND
2018-02-071610-900-0000ND
2018-02-071610-901-0000ND
2018-02-071610-902-0000ND
2018-02-071610-903-0000ND
2018-03-071610-900-1355ND
2018-03-071610-901-1220ND
2018-03-071610-902-1230ND
2018-03-071610-903-1400ND
2018-04-041610-900-1040ND
2018-04-041610-901-0820ND
2018-04-041610-902-0840ND
2018-04-041610-903-1000ND
2018-05-021610-900-1050ND
2018-05-021610-901-0830ND
2018-05-021610-902-0920ND
2018-05-021610-903-0945ND
2018-06-061610-900-1115ND
2018-06-061610-901-0840ND
2018-06-061610-902-0900ND
2018-06-061610-903-0850ND
2018-07-021610-900-1105ND
2018-07-021610-901-0850ND
2018-07-021610-902-0915ND
2018-07-021610-903-1135ND
2018-08-011610-900-1145ND
2018-08-011610-901-09553.60 ppb
2018-08-011610-902-09402.30 ppb
2018-08-011610-903-09002.40 ppb
2018-09-051610-900-1145ND
2018-09-051610-901-0915ND
2018-09-051610-902-0930ND
2018-09-051610-903-0950ND
2018-10-031610-900-1005ND
2018-10-031610-901-0655ND
2018-10-031610-902-0730ND
2018-10-031610-903-0950ND
2018-11-071610-900-1240ND
2018-11-071610-901-0905ND
2018-11-071610-902-0940ND
2018-11-071610-903-1005ND
2018-12-051610-900-14552.20 ppb
2018-12-051610-901-1425ND
2018-12-051610-902-1350ND
2018-12-051610-903-11002.60 ppb
2019-01-021610-900-1020ND
2019-01-021610-901-0820ND
2019-01-021610-902-0840ND
2019-01-021610-903-0820ND
2019-02-061610-900-1120ND
2019-02-061610-901-0910ND
2019-02-061610-902-0930ND
2019-02-061610-903-0920ND
2019-03-061610-900-0930ND
2019-03-061610-901-0700ND
2019-03-061610-902-0720ND
2019-03-061610-903-0830ND
2019-04-031610-900-1115ND
2019-04-031610-901-0905ND
2019-04-031610-902-0920ND
2019-04-031610-903-1340ND
2019-05-011610-900-1045ND
2019-05-011610-901-0725ND
2019-05-011610-902-0755ND
2019-05-011610-903-0742ND
2019-06-051610-900-0955ND
2019-06-051610-901-0750ND
2019-06-051610-902-0720ND
2019-06-051610-903-0925ND
2019-07-021610-900-1125ND
2019-07-021610-901-0920ND
2019-07-021610-902-0930ND
2019-07-021610-903-0840ND
2019-08-071610-900-1150ND
2019-08-071610-901-0900ND
2019-08-071610-902-08303.00 ppb
2019-08-071610-903-1010ND
2019-09-041610-900-09353.20 ppb
2019-09-041610-901-07102.80 ppb
2019-09-041610-902-07353.00 ppb
2019-09-041610-903-10353.90 ppb
2019-10-021610-900-10003.00 ppb
2019-10-021610-901-07253.20 ppb
2019-10-021610-902-07503.20 ppb
2019-10-021610-903-09454.00 ppb
2019-11-061610-900-1230ND
2019-11-061610-901-0700ND
2019-11-061610-902-0720ND
2019-11-061610-903-1030ND
2019-12-041610-900-1025ND
2019-12-041610-901-0830ND
2019-12-041610-902-0900ND
2019-12-041610-903-12002.20 ppb