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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

North Lake St. John 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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
2016ND160ND
2017ND160ND
2018ND160ND
20191.08 ppb1612ND - 2.30 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
2014-02-121278134ND
2014-02-121278133ND
2014-02-121278134ND
2014-02-121278133ND
2014-05-141302303ND
2014-05-141302304ND
2014-05-141302304ND
2014-05-141302303ND
2014-08-141326986ND
2014-08-141326987ND
2014-08-141326987ND
2014-08-141326986ND
2014-11-171351645ND
2014-11-171351646ND
2014-11-171351646ND
2014-11-171351645ND
2015-02-171373942ND
2015-02-171373943ND
2015-02-171373943ND
2015-02-171373942ND
2015-05-191396683ND
2015-05-191396684ND
2015-05-191396684ND
2015-05-191396683ND
2015-08-181420549ND
2015-08-181420548ND
2015-08-181420549ND
2015-08-181420548ND
2015-11-171445097ND
2015-11-171445098ND
2015-11-171445098ND
2015-11-171445097ND
2016-02-171468293ND
2016-02-171468294ND
2016-02-171468294ND
2016-02-171468293ND
2016-05-171492498ND
2016-05-171492497ND
2016-05-171492498ND
2016-05-171492497ND
2016-08-161516810ND
2016-08-161516811ND
2016-08-161516811ND
2016-08-161516810ND
2016-11-141541726ND
2016-11-141541727ND
2016-11-141541727ND
2016-11-141541726ND
2017-02-0935294548030ND
2017-02-0935294548029ND
2017-02-0935294548029ND
2017-02-0935294548030ND
2017-05-0135309911003ND
2017-05-0135309911003ND
2017-05-0135309911004ND
2017-05-0135309911004ND
2017-08-2235332046005ND
2017-08-2235332046006ND
2017-08-2235332046005ND
2017-08-2235332046006ND
2017-11-0835347267002ND
2017-11-0835347267001ND
2017-11-0835347267001ND
2017-11-0835347267002ND
2018-02-2035375735002ND
2018-02-2035375735001ND
2018-02-2035375735002ND
2018-02-2035375735001ND
2018-05-0935391496002ND
2018-05-0935391496002ND
2018-05-0935391496001ND
2018-05-0935391496001ND
2018-08-0135408245002ND
2018-08-0135408245001ND
2018-08-0135408245001ND
2018-08-0135408245002ND
2018-11-2735433613001ND
2018-11-2735433613002ND
2018-11-2735433613001ND
2018-11-2735433613002ND
2019-02-1335448500002ND
2019-02-1335448500001ND
2019-02-1335448500001ND
2019-02-1335448500002ND
2019-05-07354677170022.30 ppb
2019-05-07354677170022.30 ppb
2019-05-07354677170011.70 ppb
2019-05-07354677170011.70 ppb
2019-08-21354926780021.40 ppb
2019-08-21354926780010.920 ppb
2019-08-21354926780010.920 ppb
2019-08-21354926780021.40 ppb
2019-11-13355126850011.20 ppb
2019-11-13355126850021.10 ppb
2019-11-13355126850011.20 ppb
2019-11-13355126850021.10 ppb