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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

Pleasant Hills-crossroads Water Systems

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

 

104

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
20172.27 ppb2010ND - 11.2 ppb
20180.250 ppb202ND - 2.50 ppb
20191.93 ppb1612ND - 4.50 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
2014-02-211279938ND
2014-02-211279939ND
2014-02-211279938ND
2014-02-211279939ND
2014-05-141301259ND
2014-05-141301260ND
2014-05-141301259ND
2014-05-141301260ND
2014-07-161318241ND
2014-07-161318242ND
2014-07-161318241ND
2014-07-161318242ND
2014-10-151342690ND
2014-10-151342691ND
2014-10-151342690ND
2014-10-151342691ND
2015-01-211366425ND
2015-01-211366426ND
2015-01-211366425ND
2015-01-211366426ND
2015-04-221389275ND
2015-04-221389276ND
2015-04-221389275ND
2015-04-221389276ND
2015-07-151410782ND
2015-07-151410783ND
2015-07-151410782ND
2015-07-151410783ND
2015-11-041441182ND
2015-11-041441183ND
2015-11-041441182ND
2015-11-041441183ND
2016-01-271462333ND
2016-01-271462334ND
2016-01-271462333ND
2016-01-271462334ND
2016-04-271486257ND
2016-04-271486258ND
2016-04-271486257ND
2016-04-271486258ND
2016-07-201509064ND
2016-07-201509065ND
2016-07-201509064ND
2016-07-201509065ND
2016-10-191534644ND
2016-10-191534645ND
2016-10-191534644ND
2016-10-191534645ND
2017-01-2535291490003ND
2017-01-25352914900041.30 ppb
2017-01-2535291490003ND
2017-01-25352914900041.30 ppb
2017-04-1835307670003ND
2017-04-1835307670004ND
2017-04-1835307670003ND
2017-04-1835307670004ND
2017-05-08353116100070.690 ppb
2017-05-08353116100080.680 ppb
2017-05-08353116100070.690 ppb
2017-05-08353116100080.680 ppb
2017-07-1135323817007ND
2017-07-1135323817008ND
2017-07-1135323817007ND
2017-07-1135323817008ND
2017-10-09353413880018.80 ppb
2017-10-093534138800211.2 ppb
2017-10-09353413880018.80 ppb
2017-10-093534138800211.2 ppb
2018-01-1035367841001ND
2018-01-1035367841002ND
2018-01-1035367841001ND
2018-01-1035367841002ND
2018-04-1835387267001ND
2018-04-1835387267002ND
2018-04-1835387267001ND
2018-04-1835387267002ND
2018-07-1135403782001ND
2018-07-1135403782002ND
2018-07-1135403782001ND
2018-07-1135403782002ND
2018-07-2535407309001ND
2018-07-2535407309001ND
2018-09-1835418755001ND
2018-09-1835418755001ND
2018-10-1035423916001ND
2018-10-10354239160022.50 ppb
2018-10-1035423916001ND
2018-10-10354239160022.50 ppb
2019-01-09354418080013.50 ppb
2019-01-09354418080022.20 ppb
2019-01-09354418080013.50 ppb
2019-01-09354418080022.20 ppb
2019-04-2335464345001ND
2019-04-23354643450021.20 ppb
2019-04-2335464345001ND
2019-04-23354643450021.20 ppb
2019-07-17354835230014.50 ppb
2019-07-17354835230022.00 ppb
2019-07-17354835230014.50 ppb
2019-07-17354835230022.00 ppb
2019-10-0135502597001ND
2019-10-01355025970022.00 ppb
2019-10-0135502597001ND
2019-10-01355025970022.00 ppb