Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

City of San Jose - NSJ/Alviso

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

 

91

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
2014ND150ND
2015ND120ND
20161.13 ppb167ND - 3.00 ppb
20170.244 ppb161ND - 3.90 ppb
2018ND160ND
20190.800 ppb164ND - 3.30 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
2014-01-149590-902-1120ND
2014-01-149590-900-1155ND
2014-01-149590-901-1055ND
2014-01-149590-903-0920ND
2014-04-081610-903-0850ND
2014-04-081610-902-1050ND
2014-04-081610-901-1003ND
2014-04-081610-900-1134ND
2014-07-081610-902-1025ND
2014-07-081610-901-0955ND
2014-07-081610-900-1120ND
2014-10-141610-902-1040ND
2014-10-141610-901-1015ND
2014-10-141610-903-0855ND
2014-10-141610-900-1115ND
2015-01-131610-903-0843ND
2015-01-131610-902-1030ND
2015-01-131610-901-0950ND
2015-01-131610-900-1105ND
2015-04-141610-903-0840ND
2015-04-141610-902-1025ND
2015-04-141610-900-1105ND
2015-04-141610-901-0940ND
2015-07-141610-900-1100ND
2015-07-141610-902-1012ND
2015-07-141610-901-0936ND
2015-07-281610-903-0941ND
2016-01-121610-901-0946ND
2016-01-121610-900-1110ND
2016-01-121610-903-0841ND
2016-01-121610-902-1014ND
2016-04-121610-901-09553.00 ppb
2016-04-121610-900-1132ND
2016-04-121610-903-08522.70 ppb
2016-04-121610-902-10502.40 ppb
2016-07-121610-901-10052.40 ppb
2016-07-121610-900-11452.30 ppb
2016-07-121610-903-0902ND
2016-07-121610-902-1100ND
2016-10-111610-903-11012.80 ppb
2016-10-111610-901-12102.50 ppb
2016-10-111610-900-1001ND
2016-10-111610-902-1023ND
2017-01-101610-902-1105ND
2017-01-101610-903-0855ND
2017-01-101610-901-1020ND
2017-01-101610-900-1150ND
2017-04-111610-903-0828ND
2017-04-111610-902-1035ND
2017-04-111610-900-1115ND
2017-04-111610-901-0941ND
2017-07-111610-902-1000ND
2017-07-111610-903-0830ND
2017-07-111610-900-10393.90 ppb
2017-07-111610-901-0915ND
2017-10-111610-900-1045ND
2017-10-111610-903-0840ND
2017-10-111610-901-0930ND
2017-10-111610-902-1010ND
2018-01-091610-903-0828ND
2018-01-091610-900-1001ND
2018-01-091610-902-0935ND
2018-01-091610-901-0905ND
2018-04-091610-903-0856ND
2018-04-091610-900-0935ND
2018-04-091610-901-0825ND
2018-04-091610-902-0919ND
2018-07-101610-901-0933ND
2018-07-101610-903-0835ND
2018-07-101610-902-1101ND
2018-07-101610-900-1153ND
2018-10-091610-900-1045ND
2018-10-091610-901-0925ND
2018-10-091610-902-0953ND
2018-10-091610-903-1023ND
2019-01-081610-900-1006ND
2019-01-081610-901-0910ND
2019-01-081610-902-0945ND
2019-01-081610-903-0834ND
2019-04-091610-900-1135ND
2019-04-091610-901-1049ND
2019-04-091610-903-1116ND
2019-04-091610-902-0920ND
2019-07-091610-901-0930ND
2019-07-091610-903-0838ND
2019-07-091610-900-11003.30 ppb
2019-07-091610-902-1020ND
2019-10-081610-900-11253.30 ppb
2019-10-081610-902-08433.10 ppb
2019-10-081610-901-09543.10 ppb
2019-10-081610-903-0918ND