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EWG's Tap Water Database — 2019 UPDATE

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Trichloroacetic acid

San Antonio Water System Northeast

Trichloroacetic 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.

 

96

Samples

0

Samples exceeding legal limit (MCL)

28

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20121.26 ppb165ND - 5.90 ppb
20131.12 ppb166ND - 4.30 ppb
20141.31 ppb1611ND - 2.60 ppb
20150.475 ppb166ND - 1.70 ppb
2016ND160ND
2017ND160ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for trichloroacetic acid was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2012-01-0412010700084.50 ppb
2012-01-0412010700075.90 ppb
2012-01-0412010700064.50 ppb
2012-01-0412010700054.00 ppb
2012-05-211205665019ND
2012-05-211205665018ND
2012-05-211205665020ND
2012-05-211205665021ND
2012-07-061207217007ND
2012-07-061207217008ND
2012-07-061207217006ND
2012-07-061207217005ND
2012-10-021210100005ND
2012-10-021210100006ND
2012-10-021210100007ND
2012-10-0212101000081.30 ppb
2013-02-05AC09844ND
2013-02-05AC09848ND
2013-02-05AC09852ND
2013-02-05AC09840ND
2013-04-09AC161131.000 ppb
2013-04-09AC161161.10 ppb
2013-04-09AC16112ND
2013-04-09AC16111ND
2013-07-02AC23790ND
2013-07-02AC23786ND
2013-07-02AC23794ND
2013-07-02AC23787ND
2013-12-26AC382293.50 ppb
2013-12-26AC382283.90 ppb
2013-12-26AC382314.30 ppb
2013-12-26AC382304.10 ppb
2014-02-14AC431002.50 ppb
2014-02-14AC431062.50 ppb
2014-02-14AC430441.90 ppb
2014-02-14AC430482.60 ppb
2014-04-02AC491061.30 ppb
2014-04-02AC490851.60 ppb
2014-04-02AC490952.00 ppb
2014-04-02AC491241.90 ppb
2014-07-02AC587671.60 ppb
2014-07-02AC587641.40 ppb
2014-07-02AC587741.70 ppb
2014-07-02AC58775ND
2014-10-02AC68767ND
2014-10-02AC68790ND
2014-10-02AC68794ND
2014-10-02AC68793ND
2015-01-15AC76429ND
2015-01-15AC76443ND
2015-01-15AC76444ND
2015-01-15AC76420ND
2015-05-01AC902341.70 ppb
2015-05-01AC902541.10 ppb
2015-05-01AC90248ND
2015-05-01AC902491.20 ppb
2015-07-08AC98708ND
2015-07-08AC98709ND
2015-07-08AC98710ND
2015-07-08AC98706ND
2015-10-14AD10598ND
2015-10-14AD105911.20 ppb
2015-10-14AD105861.20 ppb
2015-10-14AD105991.20 ppb
2016-01-12AD17532ND
2016-01-12AD17533ND
2016-01-12AD17563ND
2016-01-12AD17559ND
2016-04-04AD31635ND
2016-04-04AD31639ND
2016-04-04AD31634ND
2016-04-04AD31636ND
2016-07-20AD44880ND
2016-07-20AD44875ND
2016-07-20AD44870ND
2016-07-20AD44878ND
2016-10-12AD53135ND
2016-10-12AD53119ND
2016-10-12AD53120ND
2016-10-12AD53118ND
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
2017-07-07AD88630ND
2017-07-07AD88637ND
2017-12-04AE06545ND
2017-12-04AE06543ND
2017-12-04AE06542ND
2017-12-04AE06537ND