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EWG's Tap Water Database — 2021 UPDATE

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Monochloroacetic acid

San Antonio 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

 

384

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND640ND
20150.1000 ppb643ND - 2.30 ppb
20160.0750 ppb642ND - 2.70 ppb
20170.0672 ppb642ND - 2.20 ppb
20180.0359 ppb641ND - 2.30 ppb
20190.0344 ppb641ND - 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
2014-02-17AC43103ND
2014-02-17AC43041ND
2014-02-17AC43042ND
2014-02-17AC43105ND
2014-02-17AC43099ND
2014-02-17AC43045ND
2014-02-17AC43101ND
2014-02-17AC43049ND
2014-02-17AC43104ND
2014-02-18AC43561ND
2014-02-18AC43571ND
2014-02-18AC43530ND
2014-02-18AC43543ND
2014-02-18AC43568ND
2014-02-18AC43565ND
2014-02-18AC43563ND
2014-05-14AC54209ND
2014-05-14AC54219ND
2014-05-14AC54216ND
2014-05-14AC54220ND
2014-05-14AC54221ND
2014-05-14AC54249ND
2014-05-14AC54250ND
2014-05-14AC54204ND
2014-05-15AC54319ND
2014-05-15AC54321ND
2014-05-15AC54318ND
2014-05-15AC54317ND
2014-05-15AC54320ND
2014-05-15AC54322ND
2014-05-15AC54323ND
2014-05-15AC54327ND
2014-07-30AC61638ND
2014-07-30AC61642ND
2014-07-30AC61639ND
2014-07-30AC61640ND
2014-07-30AC61641ND
2014-07-30AC61661ND
2014-07-30AC61652ND
2014-07-30AC61643ND
2014-07-31AC61836ND
2014-07-31AC61838ND
2014-07-31AC61837ND
2014-07-31AC61858ND
2014-07-31AC61835ND
2014-07-31AC61839ND
2014-07-31AC61859ND
2014-07-31AC61840ND
2014-12-01AC73192ND
2014-12-01AC73195ND
2014-12-01AC73193ND
2014-12-01AC73194ND
2014-12-01AC73191ND
2014-12-01AC73199ND
2014-12-01AC73198ND
2014-12-01AC73196ND
2014-12-02AC73321ND
2014-12-02AC73320ND
2014-12-02AC73317ND
2014-12-02AC73319ND
2014-12-02AC73316ND
2014-12-02AC73318ND
2014-12-02AC73332ND
2014-12-02AC73331ND
2015-03-04AC82723ND
2015-03-04AC82720ND
2015-03-04AC82718ND
2015-03-04AC82731ND
2015-03-04AC82722ND
2015-03-04AC82719ND
2015-03-04AC82732ND
2015-03-04AC82681ND
2015-03-05AC82699ND
2015-03-05AC82703ND
2015-03-05AC82701ND
2015-03-05AC82704ND
2015-03-05AC82702ND
2015-03-05AC82735ND
2015-03-05AC82727ND
2015-03-05AC82700ND
2015-06-03AC94401ND
2015-06-03AC94404ND
2015-06-03AC94390ND
2015-06-03AC94388ND
2015-06-03AC94389ND
2015-06-03AC94397ND
2015-06-03AC94391ND
2015-06-03AC94393ND
2015-06-04AC94737ND
2015-06-04AC94735ND
2015-06-04AC94741ND
2015-06-04AC94739ND
2015-06-04AC94740ND
2015-06-04AC94736ND
2015-06-04AC94733ND
2015-06-04AC94738ND
2015-09-02AD05294ND
2015-09-02AD05288ND
2015-09-02AD05305ND
2015-09-02AD05292ND
2015-09-02AD05306ND
2015-09-02AD05293ND
2015-09-02AD05289ND
2015-09-02AD05308ND
2015-09-03AD055822.30 ppb
2015-09-03AD055992.00 ppb
2015-09-03AD055962.10 ppb
2015-09-03AD05598ND
2015-09-03AD05580ND
2015-09-03AD05579ND
2015-09-03AD05588ND
2015-09-03AD05583ND
2015-10-26AD11685ND
2015-10-26AD11674ND
2015-10-26AD11680ND
2015-10-26AD11677ND
2015-10-26AD11692ND
2015-10-26AD11688ND
2015-10-26AD11678ND
2015-10-26AD11691ND
2015-10-27AD11815ND
2015-10-27AD11798ND
2015-10-27AD11807ND
2015-10-27AD11809ND
2015-10-27AD11799ND
2015-10-27AD11817ND
2015-10-27AD11810ND
2015-10-27AD11808ND
2016-01-13AD17852ND
2016-01-13AD17853ND
2016-01-13AD17855ND
2016-01-13AD17854ND
2016-01-13AD17857ND
2016-01-13AD17846ND
2016-01-13AD17858ND
2016-01-13AD17851ND
2016-01-14AD18179ND
2016-01-14AD18180ND
2016-01-14AD18174ND
2016-01-14AD18176ND
2016-01-14AD18178ND
2016-01-14AD18173ND
2016-01-14AD18175ND
2016-01-14AD18177ND
2016-05-31AD38710ND
2016-05-31AD38716ND
2016-05-31AD38687ND
2016-05-31AD38688ND
2016-05-31AD38689ND
2016-05-31AD38711ND
2016-05-31AD38714ND
2016-05-31AD38717ND
2016-05-31AD38719ND
2016-05-31AD38712ND
2016-05-31AD38713ND
2016-06-01AD38910ND
2016-06-01AD38917ND
2016-06-01AD38912ND
2016-06-01AD38915ND
2016-06-01AD38909ND
2016-07-20AD44881ND
2016-07-20AD44892ND
2016-07-20AD44877ND
2016-07-20AD44871ND
2016-07-20AD44879ND
2016-07-21AD45197ND
2016-07-21AD451682.10 ppb
2016-07-21AD45194ND
2016-07-21AD45169ND
2016-07-21AD45165ND
2016-07-21AD45196ND
2016-07-21AD45199ND
2016-07-21AD45201ND
2016-07-21AD45192ND
2016-07-21AD45202ND
2016-07-21AD45191ND
2016-10-31AD55409ND
2016-10-31AD55399ND
2016-10-31AD55402ND
2016-10-31AD55398ND
2016-10-31AD55403ND
2016-11-01AD55778ND
2016-11-01AD55779ND
2016-11-01AD55787ND
2016-11-01AD55782ND
2016-11-01AD55780ND
2016-11-01AD55785ND
2016-11-01AD55788ND
2016-11-01AD55781ND
2016-11-01AD557862.70 ppb
2016-11-01AD55789ND
2016-11-01AD55784ND
2017-01-31AD67822ND
2017-01-31AD67823ND
2017-01-31AD67824ND
2017-01-31AD67828ND
2017-01-31AD67830ND
2017-01-31AD67825ND
2017-01-31AD67826ND
2017-01-31AD67821ND
2017-01-31AD67829ND
2017-01-31AD67827ND
2017-01-31AD67817ND
2017-02-01AD68072ND
2017-02-01AD68069ND
2017-02-01AD68070ND
2017-02-01AD68073ND
2017-02-01AD68071ND
2017-04-24AD80641ND
2017-04-24AD80670ND
2017-04-24AD80633ND
2017-04-24AD80638ND
2017-04-24AD806452.10 ppb
2017-04-24AD80636ND
2017-04-24AD80631ND
2017-04-24AD80671ND
2017-04-24AD80632ND
2017-04-24AD806432.20 ppb
2017-04-25AD80912ND
2017-04-25AD80919ND
2017-04-25AD80915ND
2017-04-25AD80914ND
2017-04-25AD80913ND
2017-04-25AD80911ND
2017-08-09AD92534ND
2017-08-09AD92538ND
2017-08-09AD92536ND
2017-08-09AD92540ND
2017-08-09AD92550ND
2017-08-09AD92537ND
2017-08-09AD92539ND
2017-08-09AD92549ND
2017-08-10AD92718ND
2017-08-10AD92720ND
2017-08-10AD92724ND
2017-08-10AD92723ND
2017-08-10AD92716ND
2017-08-10AD92714ND
2017-08-10AD92722ND
2017-08-10AD92717ND
2017-10-16AE00804ND
2017-10-16AE00815ND
2017-10-16AE00832ND
2017-10-16AE00808ND
2017-10-16AE00805ND
2017-10-16AE00834ND
2017-10-16AE00833ND
2017-10-16AE00807ND
2017-10-16AE00809ND
2017-10-16AE00816ND
2017-10-16AE00806ND
2017-10-17AE01022ND
2017-10-17AE01020ND
2017-10-17AE01024ND
2017-10-17AE01023ND
2017-10-17AE01021ND
2018-02-27AE15710ND
2018-02-27AE15712ND
2018-02-27AE15711ND
2018-02-27AE15709ND
2018-02-27AE15707ND
2018-02-27AE15708ND
2018-02-28AE16016ND
2018-02-28AE16015ND
2018-02-28AE16011ND
2018-02-28AE16007ND
2018-02-28AE16004ND
2018-02-28AE16009ND
2018-02-28AE16017ND
2018-02-28AE16003ND
2018-02-28AE16010ND
2018-02-28AE16013ND
2018-05-07AE25264ND
2018-05-07AE25283ND
2018-05-07AE25279ND
2018-05-07AE25311ND
2018-05-07AE25285ND
2018-05-07AE25275ND
2018-05-07AE25286ND
2018-05-07AE25295ND
2018-05-07AE25297ND
2018-05-07AE25267ND
2018-05-08AE25526ND
2018-05-08AE25525ND
2018-05-08AE25524ND
2018-05-08AE25557ND
2018-05-08AE25556ND
2018-05-08AE25522ND
2018-08-22AE38083ND
2018-08-22AE38078ND
2018-08-22AE38084ND
2018-08-22AE38085ND
2018-08-22AE38112ND
2018-08-23AE38356ND
2018-08-23AE38370ND
2018-08-23AE38365ND
2018-08-23AE38374ND
2018-08-23AE38371ND
2018-08-23AE38355ND
2018-08-23AE38353ND
2018-08-23AE38352ND
2018-08-23AE38351ND
2018-08-23AE38354ND
2018-08-31AE39132ND
2018-10-24AE44457ND
2018-10-24AE44460ND
2018-10-24AE44462ND
2018-10-24AE44464ND
2018-10-24AE44461ND
2018-10-24AE444592.30 ppb
2018-10-24AE44463ND
2018-10-24AE44458ND
2018-10-25AE44594ND
2018-10-25AE44593ND
2018-10-25AE44592ND
2018-10-25AE44595ND
2018-10-25AE44590ND
2018-10-25AE44596ND
2018-10-25AE44589ND
2018-10-25AE44591ND
2019-01-29AE51907ND
2019-01-29AE51904ND
2019-01-29AE51900ND
2019-01-29AE51903ND
2019-01-29AE51905ND
2019-01-29AE51906ND
2019-01-29AE51902ND
2019-01-29AE51901ND
2019-01-30AE52175ND
2019-01-30AE52161ND
2019-01-30AE52176ND
2019-01-30AE52150ND
2019-01-30AE52160ND
2019-01-30AE52171ND
2019-01-30AE52169ND
2019-01-30AE52170ND
2019-04-23AE63326ND
2019-04-23AE63324ND
2019-04-23AE63325ND
2019-04-23AE63323ND
2019-04-24AE63499ND
2019-04-24AE63500ND
2019-04-24AE63515ND
2019-04-24AE63504ND
2019-04-24AE63516ND
2019-04-24AE63501ND
2019-04-24AE63505ND
2019-04-24AE63507ND
2019-04-24AE63514ND
2019-04-24AE63502ND
2019-04-24AE63503ND
2019-04-25AE63686ND
2019-07-24AE75735ND
2019-07-24AE75727ND
2019-07-24AE75771ND
2019-07-24AE75734ND
2019-07-24AE75770ND
2019-07-24AE75733ND
2019-07-24AE75772ND
2019-07-24AE75729ND
2019-07-24AE75730ND
2019-07-24AE75774ND
2019-07-24AE75773ND
2019-07-25AE75921ND
2019-07-25AE75927ND
2019-07-25AE75918ND
2019-07-25AE75917ND
2019-07-25AE75919ND
2019-10-30AE87945ND
2019-10-30AE87944ND
2019-10-30AE87947ND
2019-10-30AE87946ND
2019-10-30AE87942ND
2019-10-30AE87961ND
2019-10-30AE87943ND
2019-10-30AE87960ND
2019-10-31AE88160ND
2019-10-31AE881572.20 ppb
2019-10-31AE88153ND
2019-10-31AE88159ND
2019-10-31AE88156ND
2019-10-31AE88154ND
2019-10-31AE88158ND
2019-10-31AE88155ND