Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Trichloroacetic acid

City of San Marcos

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

 

192

Samples

0

Samples exceeding legal limit (MCL)

160

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.67 ppb3231ND - 7.20 ppb
20153.78 ppb3230ND - 7.60 ppb
20163.58 ppb3223ND - 11.7 ppb
20171.23 ppb3226ND - 2.40 ppb
20181.61 ppb3228ND - 3.80 ppb
20190.894 ppb3222ND - 2.10 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
2014-03-12AC467521.10 ppb
2014-03-12AC467471.80 ppb
2014-03-12AC467591.30 ppb
2014-03-12AC467581.20 ppb
2014-03-12AC46734ND
2014-03-12AC467461.30 ppb
2014-03-12AC467381.70 ppb
2014-03-12AC467371.40 ppb
2014-06-26AC583143.00 ppb
2014-06-26AC582992.00 ppb
2014-06-26AC583123.00 ppb
2014-06-26AC583172.40 ppb
2014-06-26AC583162.90 ppb
2014-06-26AC583182.20 ppb
2014-06-26AC583202.40 ppb
2014-06-26AC583152.20 ppb
2014-08-12AC632352.70 ppb
2014-08-12AC632362.40 ppb
2014-08-12AC632533.60 ppb
2014-08-12AC632404.10 ppb
2014-08-12AC632383.90 ppb
2014-08-12AC632472.40 ppb
2014-08-12AC632373.00 ppb
2014-09-25AC683207.20 ppb
2014-10-29AC708892.80 ppb
2014-10-29AC708833.50 ppb
2014-10-29AC708863.10 ppb
2014-10-29AC708723.40 ppb
2014-10-29AC708814.20 ppb
2014-10-29AC708882.80 ppb
2014-10-29AC708823.70 ppb
2014-10-29AC708752.80 ppb
2015-03-11AC837201.50 ppb
2015-03-11AC837221.60 ppb
2015-03-11AC837191.50 ppb
2015-03-11AC837251.90 ppb
2015-03-11AC837231.60 ppb
2015-03-11AC837271.50 ppb
2015-03-11AC837291.60 ppb
2015-03-11AC837281.30 ppb
2015-06-10AC953707.60 ppb
2015-06-10AC954277.60 ppb
2015-06-10AC954037.20 ppb
2015-06-10AC954006.60 ppb
2015-06-10AC954227.20 ppb
2015-06-10AC954235.90 ppb
2015-06-10AC954026.20 ppb
2015-06-10AC954013.90 ppb
2015-09-23AD082224.80 ppb
2015-09-23AD082163.40 ppb
2015-09-23AD082204.70 ppb
2015-09-23AD082175.30 ppb
2015-09-23AD082235.30 ppb
2015-09-23AD08218ND
2015-09-23AD082195.30 ppb
2015-09-23AD082214.10 ppb
2015-12-01AD149022.70 ppb
2015-12-01AD148752.30 ppb
2015-12-01AD148683.00 ppb
2015-12-01AD148764.20 ppb
2015-12-01AD148745.80 ppb
2015-12-01AD149002.40 ppb
2015-12-01AD148782.80 ppb
2015-12-01AD14869ND
2016-03-16AD290437.60 ppb
2016-03-16AD290415.60 ppb
2016-03-16AD290496.30 ppb
2016-03-16AD290425.10 ppb
2016-03-16AD2904811.7 ppb
2016-03-16AD290446.90 ppb
2016-03-16AD290457.00 ppb
2016-03-16AD290463.90 ppb
2016-06-16AD40949ND
2016-06-16AD4095411.1 ppb
2016-06-16AD409452.10 ppb
2016-06-16AD409587.70 ppb
2016-06-16AD40951ND
2016-06-16AD409538.70 ppb
2016-06-16AD40948ND
2016-06-28AD421105.50 ppb
2016-09-16AD49834ND
2016-09-16AD498364.40 ppb
2016-09-16AD49833ND
2016-09-16AD49830ND
2016-09-16AD498313.60 ppb
2016-09-16AD498353.60 ppb
2016-09-16AD498323.70 ppb
2016-09-16AD49837ND
2016-11-28AD591881.30 ppb
2016-11-28AD591871.20 ppb
2016-11-28AD591891.20 ppb
2016-11-28AD591901.30 ppb
2016-11-28AD591851.60 ppb
2016-11-28AD59191ND
2016-11-28AD591863.30 ppb
2016-11-28AD59192ND
2017-02-22AD714871.80 ppb
2017-02-22AD71490ND
2017-02-22AD714841.70 ppb
2017-02-22AD714922.40 ppb
2017-02-22AD714852.20 ppb
2017-02-22AD71488ND
2017-02-22AD714911.30 ppb
2017-02-22AD71486ND
2017-05-03AD824201.40 ppb
2017-05-03AD824331.60 ppb
2017-05-03AD824311.40 ppb
2017-05-03AD824291.90 ppb
2017-05-03AD824261.60 ppb
2017-05-03AD824181.000 ppb
2017-05-03AD824191.20 ppb
2017-05-03AD824171.000 ppb
2017-07-12AD890661.20 ppb
2017-07-12AD890681.10 ppb
2017-07-12AD890701.20 ppb
2017-07-12AD890642.30 ppb
2017-07-12AD890691.20 ppb
2017-07-12AD890671.10 ppb
2017-07-12AD890651.20 ppb
2017-07-12AD89071ND
2017-10-12AE005401.30 ppb
2017-10-12AE005441.60 ppb
2017-10-12AE00546ND
2017-10-12AE005421.80 ppb
2017-10-12AE005411.90 ppb
2017-10-12AE00545ND
2017-10-12AE005431.40 ppb
2017-10-12AE005391.40 ppb
2018-01-25AE104681.20 ppb
2018-01-25AE104691.20 ppb
2018-01-25AE104701.30 ppb
2018-01-25AE10465ND
2018-01-25AE104711.30 ppb
2018-01-25AE104671.50 ppb
2018-01-25AE104661.30 ppb
2018-01-25AE10472ND
2018-04-11AE219931.70 ppb
2018-04-11AE219941.80 ppb
2018-04-11AE219961.30 ppb
2018-04-11AE219972.80 ppb
2018-04-11AE219983.80 ppb
2018-04-11AE219991.60 ppb
2018-04-11AE219921.90 ppb
2018-04-11AE21995ND
2018-07-26AE346422.80 ppb
2018-07-26AE346402.30 ppb
2018-07-26AE346472.60 ppb
2018-07-26AE346482.90 ppb
2018-07-26AE346462.90 ppb
2018-07-26AE346432.10 ppb
2018-07-26AE346412.70 ppb
2018-07-26AE34649ND
2018-10-17AE437571.10 ppb
2018-10-17AE437521.70 ppb
2018-10-17AE437541.10 ppb
2018-10-17AE437531.80 ppb
2018-10-17AE437581.70 ppb
2018-10-17AE437551.000 ppb
2018-10-17AE437511.10 ppb
2018-10-17AE437561.10 ppb
2019-01-16AE500621.10 ppb
2019-01-16AE500641.40 ppb
2019-01-16AE500601.40 ppb
2019-01-16AE500591.90 ppb
2019-01-16AE500652.10 ppb
2019-01-16AE50066ND
2019-01-16AE500631.20 ppb
2019-01-16AE500611.20 ppb
2019-04-16AE625231.10 ppb
2019-04-16AE625251.10 ppb
2019-04-16AE62513ND
2019-04-16AE625061.10 ppb
2019-04-16AE625241.10 ppb
2019-04-16AE62507ND
2019-04-16AE62520ND
2019-04-16AE62502ND
2019-07-09AE736441.10 ppb
2019-07-09AE736411.90 ppb
2019-07-09AE736421.30 ppb
2019-07-09AE736461.40 ppb
2019-07-09AE73643ND
2019-07-09AE73647ND
2019-07-09AE73653ND
2019-07-09AE736481.60 ppb
2019-10-10AE862911.10 ppb
2019-10-10AE862991.10 ppb
2019-10-10AE862941.30 ppb
2019-10-10AE862931.000 ppb
2019-10-10AE86298ND
2019-10-10AE862951.10 ppb
2019-10-10AE86292ND
2019-10-10AE862971.000 ppb