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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

San Antonio Water System Northeast

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
2013N/A00N/A
2014ND160ND
20150.200 ppb161ND - 3.20 ppb
2016ND160ND
2017ND160ND
20180.550 ppb162ND - 5.30 ppb
20190.925 ppb244ND - 6.30 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
2014-02-14AC43100ND
2014-02-14AC43106ND
2014-02-14AC43044ND
2014-02-14AC43048ND
2014-04-02AC49124ND
2014-04-02AC49095ND
2014-04-02AC49085ND
2014-04-02AC49106ND
2014-07-02AC58767ND
2014-07-02AC58764ND
2014-07-02AC58774ND
2014-07-02AC58775ND
2014-10-02AC68793ND
2014-10-02AC68794ND
2014-10-02AC68790ND
2014-10-02AC68767ND
2015-01-15AC764203.20 ppb
2015-01-15AC76444ND
2015-01-15AC76443ND
2015-01-15AC76429ND
2015-05-01AC90234ND
2015-05-01AC90254ND
2015-05-01AC90248ND
2015-05-01AC90249ND
2015-07-08AC98706ND
2015-07-08AC98710ND
2015-07-08AC98709ND
2015-07-08AC98708ND
2015-10-14AD10598ND
2015-10-14AD10591ND
2015-10-14AD10586ND
2015-10-14AD10599ND
2016-01-12AD17559ND
2016-01-12AD17563ND
2016-01-12AD17533ND
2016-01-12AD17532ND
2016-04-04AD31635ND
2016-04-04AD31639ND
2016-04-04AD31634ND
2016-04-04AD31636ND
2016-07-20AD44880ND
2016-07-20AD44875ND
2016-07-20AD44870ND
2016-07-20AD44878ND
2016-10-12AD53118ND
2016-10-12AD53120ND
2016-10-12AD53119ND
2016-10-12AD53135ND
2017-01-05AD63192ND
2017-01-05AD63196ND
2017-01-05AD63190ND
2017-01-05AD63193ND
2017-04-03AD78036ND
2017-04-03AD78034ND
2017-04-03AD78037ND
2017-04-03AD78039ND
2017-07-07AD88653ND
2017-07-07AD88636ND
2017-07-07AD88637ND
2017-07-07AD88630ND
2017-12-04AE06545ND
2017-12-04AE06537ND
2017-12-04AE06542ND
2017-12-04AE06543ND
2018-01-18AE09212ND
2018-01-18AE09213ND
2018-01-18AE09223ND
2018-01-18AE09220ND
2018-04-19AE23195ND
2018-04-19AE23204ND
2018-04-19AE23199ND
2018-04-19AE23196ND
2018-08-31AE39130ND
2018-08-31AE39128ND
2018-08-31AE39131ND
2018-08-31AE39129ND
2018-11-20AE466523.50 ppb
2018-11-20AE46655ND
2018-11-20AE46654ND
2018-11-20AE466535.30 ppb
2019-01-28AE515915.60 ppb
2019-01-28AE515904.50 ppb
2019-01-28AE515885.80 ppb
2019-01-28AE515896.30 ppb
2019-04-22AE63146ND
2019-04-22AE63148ND
2019-04-22AE63147ND
2019-04-22AE63149ND
2019-07-26AE76121ND
2019-07-26AE76124ND
2019-07-26AE76126ND
2019-07-26AE76122ND
2019-07-26AE76120ND
2019-07-26AE76123ND
2019-07-26AE76125ND
2019-07-26AE76163ND
2019-10-29AE87840ND
2019-10-29AE87846ND
2019-10-29AE87855ND
2019-10-29AE87843ND
2019-10-29AE87861ND
2019-10-29AE87842ND
2019-10-29AE87844ND
2019-10-29AE87845ND