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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Chico

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.28 ppb42ND - 6.00 ppb
2015ND40ND
2016ND40ND
2017ND40ND
20181.08 ppb43ND - 2.00 ppb
2019ND40ND

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
2014-03-19Q14090040023.10 ppb
2014-06-24Q14234290016.00 ppb
2014-08-25Q1438988008ND
2014-12-09Q1459211001ND
2015-03-18Q1510146023ND
2015-06-11Q1521662001ND
2015-09-10Q1535197001ND
2015-11-30Q1547068001ND
2016-03-17Q1611139001ND
2016-06-21Q1625425001ND
2016-09-08Q1636414001ND
2016-12-06Q1653274010ND
2017-02-27Q1708321012ND
2017-05-16Q1719926001ND
2017-09-05Q1741045001ND
2017-12-14Q1766171001ND
2018-02-28Q1808235001ND
2018-06-07Q18227020011.20 ppb
2018-09-26Q18385000012.00 ppb
2018-12-13Q18516760231.10 ppb
2019-01-08Q1900653007ND
2019-04-09Q1914098001ND
2019-08-13Q1954152001ND
2019-11-21Q1977808001ND