Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Monochloroacetic acid

Waterproof 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

 

98

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20143.03 ppb168ND - 11.0 ppb
20152.38 ppb1612ND - 8.60 ppb
20160.513 ppb164ND - 2.30 ppb
20170.967 ppb186ND - 3.90 ppb
20180.563 ppb166ND - 2.00 ppb
20192.18 ppb16161.10 ppb - 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
2014-03-06L0040519-025.20 ppb
2014-03-06L0040519-0111.0 ppb
2014-03-06L0040519-025.20 ppb
2014-03-06L0040519-0111.0 ppb
2014-06-16351423170011.30 ppb
2014-06-16351423170026.70 ppb
2014-06-16351423170026.70 ppb
2014-06-16351423170011.30 ppb
2014-09-04L0047727-01ND
2014-09-04L0047727-02ND
2014-09-04L0047727-02ND
2014-09-04L0047727-01ND
2014-12-11L0051811-01ND
2014-12-11L0051811-02ND
2014-12-11L0051811-02ND
2014-12-11L0051811-01ND
2015-03-03LA4217-1ND
2015-03-03LA4217-2ND
2015-03-03LA4217-2ND
2015-03-03LA4217-1ND
2015-06-04351917990011.60 ppb
2015-06-04351917990021.40 ppb
2015-06-04351917990021.40 ppb
2015-06-04351917990011.60 ppb
2015-09-03352063650012.10 ppb
2015-09-03352063650021.70 ppb
2015-09-03352063650012.10 ppb
2015-09-03352063650021.70 ppb
2015-12-01LA14582-28.60 ppb
2015-12-01LA14582-13.60 ppb
2015-12-01LA14582-28.60 ppb
2015-12-01LA14582-13.60 ppb
2016-03-03LA17947-11.80 ppb
2016-03-03LA17947-22.30 ppb
2016-03-03LA17947-22.30 ppb
2016-03-03LA17947-11.80 ppb
2016-06-09LA21714-1ND
2016-06-09LA21714-1ND
2016-06-09LA21714-2ND
2016-06-09LA21714-2ND
2016-09-22LA25837-1ND
2016-09-22LA25837-1ND
2016-09-22LA25837-2ND
2016-09-22LA25837-2ND
2016-12-06LA28342-1ND
2016-12-06LA28342-2ND
2016-12-06LA28342-1ND
2016-12-06LA28342-2ND
2017-03-0935300113003ND
2017-03-0935300113004ND
2017-03-0935300113004ND
2017-03-0935300113003ND
2017-06-1935319531002ND
2017-06-19353195310011.50 ppb
2017-06-19353195310011.50 ppb
2017-06-1935319531002ND
2017-09-1835336925002ND
2017-09-1835336925001ND
2017-09-1835336925002ND
2017-09-1835336925003ND
2017-09-1835336925003ND
2017-09-1835336925001ND
2017-12-18353647130023.30 ppb
2017-12-18353647130013.90 ppb
2017-12-18353647130013.90 ppb
2017-12-18353647130023.30 ppb
2018-03-01353778590011.60 ppb
2018-03-01353778590022.00 ppb
2018-03-01353778590011.60 ppb
2018-03-01353778590022.00 ppb
2018-06-1935399865002ND
2018-06-1935399865001ND
2018-06-1935399865001ND
2018-06-1935399865002ND
2018-09-1035417621002ND
2018-09-10354176210010.900 ppb
2018-09-10354176210010.900 ppb
2018-09-1035417621002ND
2018-12-1035437322001ND
2018-12-1035437322002ND
2018-12-1035437322001ND
2018-12-1035437322002ND
2019-03-11354542620021.10 ppb
2019-03-11354542620011.10 ppb
2019-03-11354542620011.10 ppb
2019-03-11354542620021.10 ppb
2019-06-12354755390021.90 ppb
2019-06-12354755390021.90 ppb
2019-06-12354755390011.80 ppb
2019-06-12354755390011.80 ppb
2019-09-17354995330022.10 ppb
2019-09-17354995330011.50 ppb
2019-09-17354995330011.50 ppb
2019-09-17354995330022.10 ppb
2019-12-13355189340014.00 ppb
2019-12-13355189340023.90 ppb
2019-12-13355189340014.00 ppb
2019-12-13355189340023.90 ppb