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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

City of San Juan

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.

MORE ABOUT THIS CONTAMINANT

 

96

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015ND160ND
2016ND160ND
20170.900 ppb162ND - 7.20 ppb
20180.150 ppb162ND - 1.30 ppb
20190.650 ppb163ND - 4.70 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic 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.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
2014-02-28AC45257ND
2014-02-28AC45294ND
2014-02-28AC45295ND
2014-02-28AC45290ND
2014-04-22AC51376ND
2014-04-22AC51385ND
2014-04-22AC51386ND
2014-04-22AC51384ND
2014-07-23AC60790ND
2014-07-23AC60789ND
2014-07-23AC60791ND
2014-07-23AC60792ND
2014-10-21AC70190ND
2014-10-21AC70147ND
2014-10-21AC70186ND
2014-10-21AC70189ND
2015-01-21AC77205ND
2015-01-21AC77197ND
2015-01-21AC77207ND
2015-01-21AC77206ND
2015-04-07AC87473ND
2015-04-07AC87445ND
2015-04-07AC87454ND
2015-04-07AC87453ND
2015-07-14AC99328ND
2015-07-14AC99338ND
2015-07-14AC99336ND
2015-07-14AC99329ND
2015-10-20AD11170ND
2015-10-20AD11172ND
2015-10-20AD11163ND
2015-10-20AD11155ND
2016-01-29AD21012ND
2016-01-29AD21029ND
2016-01-29AD21014ND
2016-01-29AD21023ND
2016-04-29AD34809ND
2016-04-29AD34807ND
2016-04-29AD34806ND
2016-04-29AD34805ND
2016-07-14AD44219ND
2016-07-14AD44220ND
2016-07-14AD44232ND
2016-07-14AD44236ND
2016-11-15AD57987ND
2016-11-15AD57983ND
2016-11-15AD58009ND
2016-11-15AD58004ND
2017-01-10AD63919ND
2017-01-10AD63920ND
2017-01-10AD63921ND
2017-01-10AD63922ND
2017-04-21AD80637ND
2017-04-21AD80639ND
2017-04-21AD80642ND
2017-04-21AD80640ND
2017-07-14AD89480ND
2017-07-14AD89484ND
2017-07-14AD89481ND
2017-07-14AD89477ND
2017-10-31AE02920ND
2017-10-31AE029027.20 ppb
2017-10-31AE02916ND
2017-10-31AE028987.20 ppb
2018-01-24AE10150ND
2018-01-24AE10135ND
2018-01-24AE10146ND
2018-01-24AE10147ND
2018-04-11AE220431.30 ppb
2018-04-11AE22049ND
2018-04-11AE22048ND
2018-04-11AE220441.10 ppb
2018-08-16AE37329ND
2018-08-16AE37333ND
2018-08-16AE37330ND
2018-08-16AE37323ND
2018-10-10AE43052ND
2018-10-10AE43059ND
2018-10-10AE43055ND
2018-10-10AE43051ND
2019-02-26AE55942ND
2019-02-26AE55944ND
2019-02-26AE55947ND
2019-02-26AE55948ND
2019-05-21AE673433.00 ppb
2019-05-21AE673452.70 ppb
2019-05-21AE673354.70 ppb
2019-05-21AE67334ND
2019-09-04AE82019ND
2019-09-04AE82012ND
2019-09-04AE82017ND
2019-09-04AE82021ND
2019-11-07AE88872ND
2019-11-07AE88871ND
2019-11-07AE88874ND
2019-11-07AE88869ND