Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

Concord Water System

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)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201416.1 ppb168ND - 71.0 ppb
20156.74 ppb1610ND - 30.0 ppb
201617.4 ppb168ND - 68.7 ppb
20170.375 ppb164ND - 1.60 ppb
20180.738 ppb164ND - 4.60 ppb
2019ND160ND

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
2014-02-25L0040098-0271.0 ppb
2014-02-25L0040098-0155.0 ppb
2014-02-25L0040098-0271.0 ppb
2014-02-25L0040098-0155.0 ppb
2014-05-19L0043223-01ND
2014-05-19L0043223-02ND
2014-05-19L0043223-02ND
2014-05-19L0043223-01ND
2014-08-20351522500011.20 ppb
2014-08-20351522500021.50 ppb
2014-08-20351522500021.50 ppb
2014-08-20351522500011.20 ppb
2014-11-03L0050160-01ND
2014-11-03L0050160-02ND
2014-11-03L0050160-02ND
2014-11-03L0050160-01ND
2015-02-10LA3481-15.70 ppb
2015-02-10LA3481-215.7 ppb
2015-02-10LA3481-215.7 ppb
2015-02-10LA3481-15.70 ppb
2015-05-14LA7070-1ND
2015-05-14LA7070-2ND
2015-05-14LA7070-2ND
2015-05-14LA7070-1ND
2015-08-18352037350021.10 ppb
2015-08-18352037350011.40 ppb
2015-08-18352037350021.10 ppb
2015-08-18352037350011.40 ppb
2015-11-18LA14263-1ND
2015-11-18LA14263-230.0 ppb
2015-11-18LA14263-230.0 ppb
2015-11-18LA14263-1ND
2016-02-09LA17062-1ND
2016-02-09LA17063-1ND
2016-02-09LA17063-1ND
2016-02-09LA17062-1ND
2016-05-18LA20832-2ND
2016-05-18LA20832-1ND
2016-05-18LA20832-2ND
2016-05-18LA20832-1ND
2016-08-24LA24659-165.8 ppb
2016-08-24LA24659-268.7 ppb
2016-08-24LA24659-268.7 ppb
2016-08-24LA24659-165.8 ppb
2016-11-16LA27746-11.90 ppb
2016-11-16LA27746-22.80 ppb
2016-11-16LA27746-22.80 ppb
2016-11-16LA27746-11.90 ppb
2017-02-0235292874008ND
2017-02-0235292874007ND
2017-02-0235292874007ND
2017-02-0235292874008ND
2017-05-16353126260051.60 ppb
2017-05-16353126260051.60 ppb
2017-05-16353126260061.40 ppb
2017-05-16353126260061.40 ppb
2017-08-0935329805017ND
2017-08-0935329805018ND
2017-08-0935329805017ND
2017-08-0935329805018ND
2017-11-1535349184002ND
2017-11-1535349184001ND
2017-11-1535349184001ND
2017-11-1535349184002ND
2018-02-2035375784002ND
2018-02-20353757840011.30 ppb
2018-02-2035375784002ND
2018-02-20353757840011.30 ppb
2018-05-2335394580002ND
2018-05-2335394580002ND
2018-05-2335394580001ND
2018-05-2335394580001ND
2018-08-2035412777002ND
2018-08-20354127770014.60 ppb
2018-08-20354127770014.60 ppb
2018-08-2035412777002ND
2018-11-1335431641001ND
2018-11-1335431641002ND
2018-11-1335431641001ND
2018-11-1335431641002ND
2019-02-1835449365002ND
2019-02-1835449365001ND
2019-02-1835449365001ND
2019-02-1835449365002ND
2019-05-1435469371002ND
2019-05-1435469371002ND
2019-05-1435469371001ND
2019-05-1435469371001ND
2019-08-1935491954002ND
2019-08-1935491954001ND
2019-08-1935491954001ND
2019-08-1935491954002ND
2019-11-1335512566001ND
2019-11-1335512566002ND
2019-11-1335512566001ND
2019-11-1335512566002ND