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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

City of Lancaster

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
20141.34 ppb166ND - 4.20 ppb
20153.77 ppb1612ND - 6.90 ppb
20160.738 ppb163ND - 4.40 ppb
2017ND160ND
20181.66 ppb169ND - 6.20 ppb
20190.906 ppb168ND - 2.20 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
2014-02-24Q14058510043.90 ppb
2014-02-24Q14058510033.30 ppb
2014-02-24Q14058510023.60 ppb
2014-02-24Q14058510013.60 ppb
2014-05-16Q1416669004ND
2014-05-16Q1416669003ND
2014-05-16Q1416669002ND
2014-05-16Q1416669001ND
2014-07-10Q1427172004ND
2014-07-10Q1427172003ND
2014-07-10Q1427172005ND
2014-07-10Q1427172006ND
2014-10-28Q1454441004ND
2014-10-28Q14544410034.20 ppb
2014-10-28Q14544410022.80 ppb
2014-10-28Q1454441001ND
2015-03-19Q15104650055.90 ppb
2015-03-19Q15104650046.30 ppb
2015-03-19Q15104650036.90 ppb
2015-03-19Q15104650026.80 ppb
2015-06-16Q15224050012.90 ppb
2015-06-16Q15224050025.50 ppb
2015-06-16Q15224050043.90 ppb
2015-06-16Q15224050033.70 ppb
2015-08-18Q1532666004ND
2015-08-18Q1532666003ND
2015-08-18Q15326660023.60 ppb
2015-08-18Q15326660013.60 ppb
2015-10-21Q1541383004ND
2015-10-21Q1541383003ND
2015-10-21Q15413830025.80 ppb
2015-10-21Q15413830015.40 ppb
2016-01-21Q1602700002ND
2016-01-21Q1602700001ND
2016-01-21Q1602700003ND
2016-01-21Q1602700004ND
2016-04-14Q16148830044.10 ppb
2016-04-14Q16148830033.30 ppb
2016-04-14Q1614883002ND
2016-04-14Q16148830014.40 ppb
2016-07-05Q1626763004ND
2016-07-05Q1626763003ND
2016-07-05Q1626763002ND
2016-07-05Q1626763001ND
2016-10-07Q1642683001ND
2016-10-07Q1642683004ND
2016-10-07Q1642683003ND
2016-10-07Q1642683002ND
2017-01-10Q1700958002ND
2017-01-10Q1700958004ND
2017-01-10Q1700958001ND
2017-01-10Q1700958003ND
2017-04-04Q1713778003ND
2017-04-04Q1713778006ND
2017-04-04Q1713778002ND
2017-04-04Q1713778005ND
2017-07-05Q1727591003ND
2017-07-05Q1727591001ND
2017-07-05Q1727591002ND
2017-07-05Q1727591004ND
2017-10-16Q1753559002ND
2017-10-16Q1753559003ND
2017-10-16Q1753559004ND
2017-10-16Q1753559001ND
2018-01-31Q1803989004ND
2018-01-31Q1803989002ND
2018-01-31Q1803989003ND
2018-01-31Q1803989001ND
2018-04-12Q18152360026.20 ppb
2018-04-12Q18152360054.80 ppb
2018-04-12Q18152360033.90 ppb
2018-04-12Q18152360064.00 ppb
2018-07-12Q1827721004ND
2018-07-12Q1827721002ND
2018-07-12Q18277210031.000 ppb
2018-07-12Q1827721001ND
2018-10-11Q18405810042.10 ppb
2018-10-11Q18405810022.20 ppb
2018-10-11Q18405810031.20 ppb
2018-10-11Q18405810011.20 ppb
2019-01-09Q19011410022.00 ppb
2019-01-09Q19011410052.00 ppb
2019-01-09Q19011410041.80 ppb
2019-01-09Q19011410031.70 ppb
2019-04-15Q19150180032.20 ppb
2019-04-15Q19150180022.20 ppb
2019-04-15Q19150180011.60 ppb
2019-06-19Q19386270011.000 ppb
2019-08-06Q1951798004ND
2019-08-06Q1951798003ND
2019-08-06Q1951798002ND
2019-08-06Q1951798001ND
2019-10-10Q1972252002ND
2019-10-10Q1972252005ND
2019-10-10Q1972252004ND
2019-10-10Q1972252003ND