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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

San Diego County Water Authority

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

 

124

Samples

0

Samples exceeding legal limit (MCL)

38

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.105 ppb222ND - 1.20 ppb
20150.196 ppb243ND - 2.00 ppb
20160.672 ppb186ND - 3.50 ppb
20171.14 ppb2010ND - 4.00 ppb
20180.273 ppb225ND - 1.60 ppb
20192.17 ppb1812ND - 9.40 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
2014-01-049590-003-1020ND
2014-01-069590-003-1022ND
2014-02-059590-003-1030ND
2014-03-039590-003-1223ND
2014-04-059590-003-1340ND
2014-04-079590-003-1342ND
2014-05-039590-003-1027ND
2014-05-059590-003-1250ND
2014-06-019590-003-0734ND
2014-06-039590-003-0739ND
2014-07-059590-003-11501.20 ppb
2014-07-079590-003-12301.10 ppb
2014-08-029590-003-1139ND
2014-08-049590-003-1401ND
2014-09-069590-003-1012ND
2014-09-089590-003-1030ND
2014-10-049590-003-1145ND
2014-10-069590-003-1204ND
2014-11-039590-003-1319ND
2014-11-059590-003-1320ND
2014-12-069590-003-1220ND
2014-12-089590-003-1228ND
2015-01-039590-003-1200ND
2015-01-059590-003-1205ND
2015-02-019590-003-0818ND
2015-02-039590-003-0900ND
2015-03-159590-003-10001.20 ppb
2015-03-179590-003-1356ND
2015-04-049590-003-0805ND
2015-04-069590-003-1120ND
2015-05-059590-003-1045ND
2015-05-079590-003-1051ND
2015-06-019590-003-1205ND
2015-06-039590-003-1207ND
2015-07-099590-003-1050ND
2015-07-099590-003-1108ND
2015-08-039590-003-1020ND
2015-08-059590-003-1023ND
2015-09-019590-003-1129ND
2015-09-039590-003-1300ND
2015-10-039590-003-0731ND
2015-10-059590-003-0725ND
2015-11-019590-003-0950ND
2015-11-039590-003-0955ND
2015-12-089590-003-07072.00 ppb
2015-12-109590-003-07311.50 ppb
2016-01-149590-003-21291.40 ppb
2016-01-169590-003-21401.40 ppb
2016-02-099590-003-14053.50 ppb
2016-02-119590-003-14063.40 ppb
2016-03-199590-003-0818ND
2016-03-219590-003-0823ND
2016-04-059590-003-10591.10 ppb
2016-04-079590-003-11171.30 ppb
2016-05-019590-003-1203ND
2016-05-039590-003-1230ND
2016-07-059590-003-1200ND
2016-07-079590-003-1225ND
2016-08-019590-003-1100ND
2016-08-039590-003-1103ND
2016-10-019590-003-0721ND
2016-10-039590-003-0723ND
2016-11-019590-003-1000ND
2016-11-039590-003-1017ND
2017-01-249590-003-13451.50 ppb
2017-01-269590-003-13471.40 ppb
2017-03-259590-003-10284.00 ppb
2017-03-279590-003-10304.00 ppb
2017-04-019590-003-10132.30 ppb
2017-04-039590-003-10152.50 ppb
2017-05-019590-003-10002.30 ppb
2017-05-039590-003-10592.00 ppb
2017-07-049590-003-1000ND
2017-07-069590-003-1142ND
2017-08-019590-003-0830ND
2017-08-039590-003-0833ND
2017-09-059590-003-07301.40 ppb
2017-09-079590-003-08381.30 ppb
2017-10-019590-003-1133ND
2017-10-039590-003-1135ND
2017-11-269590-003-1100ND
2017-11-289590-003-1103ND
2017-12-059590-003-0845ND
2017-12-079590-003-0859ND
2018-01-019590-003-0900ND
2018-01-039590-003-0902ND
2018-02-039590-003-05511.000 ppb
2018-02-059590-003-0555ND
2018-03-199590-003-09001.20 ppb
2018-03-219590-003-09001.60 ppb
2018-04-019590-003-0900ND
2018-04-039590-003-0903ND
2018-05-069590-003-0900ND
2018-05-089590-003-0903ND
2018-06-269590-003-1300ND
2018-06-289590-003-1303ND
2018-07-159590-003-07551.20 ppb
2018-07-179590-003-0759ND
2018-08-049590-003-11151.000 ppb
2018-08-069590-003-1116ND
2018-09-029590-003-0930ND
2018-09-049590-003-0933ND
2018-10-019590-003-1000ND
2018-10-039590-003-1003ND
2018-11-019590-003-1052ND
2018-11-039590-003-1100ND
2019-04-219590-003-08089.40 ppb
2019-04-239590-003-08119.30 ppb
2019-05-159590-003-08004.10 ppb
2019-05-179590-003-10293.80 ppb
2019-06-179590-003-06361.70 ppb
2019-06-199590-003-08522.00 ppb
2019-07-019590-003-07351.50 ppb
2019-07-039590-003-08001.40 ppb
2019-08-089590-003-0855ND
2019-08-089590-003-1050ND
2019-09-039590-003-0734ND
2019-09-049590-003-0712ND
2019-10-019590-003-07201.60 ppb
2019-10-039590-003-04181.70 ppb
2019-11-049590-003-0708ND
2019-11-069590-003-0621ND
2019-12-119590-003-06151.30 ppb
2019-12-139590-003-06101.30 ppb