Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

Walnut Creek SUD

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
2013N/A00N/A
20142.14 ppb1611ND - 4.30 ppb
20152.79 ppb166ND - 12.7 ppb
20161.33 ppb164ND - 5.60 ppb
2017ND160ND
20182.13 ppb1615ND - 3.60 ppb
20191.93 ppb1614ND - 2.90 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
2014-02-26Q14063680044.30 ppb
2014-02-26Q14063680034.10 ppb
2014-02-26Q14063680023.90 ppb
2014-02-26Q14063680014.00 ppb
2014-05-29Q1418404004ND
2014-05-29Q14184040032.10 ppb
2014-05-29Q1418404002ND
2014-05-29Q14184040013.50 ppb
2014-09-03Q1441134004ND
2014-09-03Q1441134003ND
2014-09-03Q14411340052.20 ppb
2014-09-03Q14411340062.10 ppb
2014-12-01Q1457746004ND
2014-12-01Q14577460032.30 ppb
2014-12-01Q14577460023.10 ppb
2014-12-01Q14577460012.60 ppb
2015-03-03Q1507940006ND
2015-03-03Q1507940005ND
2015-03-03Q1507940004ND
2015-03-03Q1507940003ND
2015-06-02Q15203610012.50 ppb
2015-06-02Q1520361002ND
2015-06-02Q1520361004ND
2015-06-02Q1520361003ND
2015-09-15Q153584300612.7 ppb
2015-09-15Q153584300511.1 ppb
2015-09-15Q153584300410.4 ppb
2015-09-15Q1535843003ND
2015-12-14Q15497780044.00 ppb
2015-12-14Q1549778003ND
2015-12-14Q15497780023.90 ppb
2015-12-14Q1549778001ND
2016-02-29Q16081830104.90 ppb
2016-02-29Q16081830095.20 ppb
2016-02-29Q16081830115.60 ppb
2016-02-29Q16081830125.60 ppb
2016-05-31Q1621276004ND
2016-05-31Q1621276003ND
2016-05-31Q1621276002ND
2016-05-31Q1621276001ND
2016-09-26Q1640029006ND
2016-09-26Q1640029005ND
2016-09-26Q1640029004ND
2016-09-26Q1640029003ND
2016-12-14Q1654569001ND
2016-12-14Q1654569004ND
2016-12-14Q1654569002ND
2016-12-14Q1654569003ND
2017-02-13Q1706085004ND
2017-02-13Q1706085006ND
2017-02-13Q1706085003ND
2017-02-13Q1706085002ND
2017-05-22Q1720856004ND
2017-05-22Q1720856003ND
2017-05-22Q1720856002ND
2017-05-22Q1720856001ND
2017-08-28Q1738759004ND
2017-08-28Q1738759006ND
2017-08-28Q1738759001ND
2017-08-28Q1738759005ND
2017-11-07Q1756950002ND
2017-11-07Q1756950004ND
2017-11-07Q1756950001ND
2017-11-07Q1756950003ND
2018-02-15Q1806665008ND
2018-02-15Q18066650072.70 ppb
2018-02-15Q18066650062.70 ppb
2018-02-15Q18066650051.60 ppb
2018-04-23Q18163860023.00 ppb
2018-04-23Q18163860033.20 ppb
2018-04-23Q18163860013.10 ppb
2018-05-02Q18177560013.60 ppb
2018-07-23Q18290230041.50 ppb
2018-07-23Q18290230061.40 ppb
2018-07-23Q18290230031.70 ppb
2018-07-23Q18290230051.60 ppb
2018-10-16Q18410600042.00 ppb
2018-10-16Q18410600031.90 ppb
2018-10-16Q18410600021.90 ppb
2018-10-16Q18410600012.10 ppb
2019-01-22Q19030730072.20 ppb
2019-01-22Q19030730082.60 ppb
2019-01-22Q19030730092.30 ppb
2019-01-22Q19030730102.10 ppb
2019-04-23Q19162480021.90 ppb
2019-04-23Q19162480042.10 ppb
2019-04-23Q19162480012.20 ppb
2019-04-23Q19162480032.00 ppb
2019-08-22Q19584730062.80 ppb
2019-08-22Q19584730052.30 ppb
2019-08-22Q19584730042.90 ppb
2019-08-22Q19584730032.90 ppb
2019-11-18Q19771200011.20 ppb
2019-11-18Q1977120004ND
2019-11-18Q1977120003ND
2019-11-18Q19771200021.30 ppb