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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Montclair Water Bureau

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
20143.80 ppb16162.20 ppb - 5.77 ppb
20151.41 ppb168ND - 3.72 ppb
20161.53 ppb1610ND - 2.81 ppb
20172.16 ppb1612ND - 4.39 ppb
20182.12 ppb1611ND - 3.98 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
2014-02-12AB001833.64 ppb
2014-02-12AB001843.18 ppb
2014-02-12AB001863.82 ppb
2014-02-12AB001853.70 ppb
2014-05-13AB016264.44 ppb
2014-05-13AB016285.66 ppb
2014-05-13AB016255.77 ppb
2014-05-13AB016275.25 ppb
2014-08-12AB036402.41 ppb
2014-08-12AB036422.51 ppb
2014-08-12AB036392.91 ppb
2014-08-12AB036412.35 ppb
2014-11-13AB049603.73 ppb
2014-11-13AB049582.20 ppb
2014-11-13AB049575.67 ppb
2014-11-13AB049593.53 ppb
2015-02-11AB066492.12 ppb
2015-02-11AB066483.38 ppb
2015-02-11AB06647ND
2015-02-11AB066502.12 ppb
2015-05-13AB08508ND
2015-05-13AB08506ND
2015-05-13AB08507ND
2015-05-13AB085092.38 ppb
2015-08-12AB099103.02 ppb
2015-08-12AB099083.72 ppb
2015-08-12AB09909ND
2015-08-12AB099112.93 ppb
2015-11-12AB115922.83 ppb
2015-11-12AB11594ND
2015-11-12AB11593ND
2015-11-12AB11595ND
2016-02-10AB135742.65 ppb
2016-02-10AB13572ND
2016-02-10AB135752.07 ppb
2016-02-10AB135732.77 ppb
2016-05-11AB15230ND
2016-05-11AB152332.38 ppb
2016-05-11AB152322.10 ppb
2016-05-11AB152312.24 ppb
2016-08-12AB173722.81 ppb
2016-08-12AB173752.52 ppb
2016-08-12AB173742.63 ppb
2016-08-12AB17373ND
2016-11-16AB19332ND
2016-11-16AB193312.27 ppb
2016-11-16AB19333ND
2016-11-16AB19334ND
2017-02-15AB211544.06 ppb
2017-02-15AB211512.89 ppb
2017-02-15AB211534.39 ppb
2017-02-15AB21152ND
2017-05-16AB233832.05 ppb
2017-05-16AB233842.23 ppb
2017-05-16AB23381ND
2017-05-16AB233822.31 ppb
2017-08-29AB264783.18 ppb
2017-08-29AB264753.87 ppb
2017-08-29AB264762.59 ppb
2017-08-29AB264772.65 ppb
2017-11-15AB27875ND
2017-11-15AB27876ND
2017-11-15AB278772.18 ppb
2017-11-15AB278742.11 ppb
2018-02-13AB299343.89 ppb
2018-02-13AB29932ND
2018-02-13AB299332.55 ppb
2018-02-13AB299352.36 ppb
2018-05-15AB320413.98 ppb
2018-05-15AB320393.51 ppb
2018-05-15AB320422.94 ppb
2018-05-15AB320403.70 ppb
2018-08-06AB342512.86 ppb
2018-08-06AB342492.87 ppb
2018-08-06AB342502.33 ppb
2018-08-06AB342482.88 ppb
2018-11-15AB36312ND
2018-11-15AB36310ND
2018-11-15AB36311ND
2018-11-15AB36309ND
2019-02-14AB38359ND
2019-02-14AB38361ND
2019-02-14AB38360ND
2019-02-14AB38362ND
2019-05-16AB40646ND
2019-05-16AB40647ND
2019-05-16AB40644ND
2019-05-16AB40645ND
2019-08-30AB43012ND
2019-08-30AB43010ND
2019-08-30AB43011ND
2019-08-30AB43013ND
2019-11-14AB45335ND
2019-11-14AB45336ND
2019-11-14AB45338ND
2019-11-14AB45337ND