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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

Regional 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

 

240

Samples

0

Samples exceeding legal limit (MCL)

239

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201421.1 ppb48486.20 ppb - 30.2 ppb
2015N/A00N/A
201620.4 ppb4847ND - 37.2 ppb
201722.1 ppb48485.30 ppb - 32.0 ppb
201824.8 ppb48489.80 ppb - 45.3 ppb
201917.1 ppb48489.20 ppb - 26.4 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
2014-03-04DBP 20039195421.5 ppb
2014-03-04DBP 20039195922.2 ppb
2014-03-04DBP 20039197424.6 ppb
2014-03-05DBP 20039209225.7 ppb
2014-03-05DBP 20039209323.9 ppb
2014-03-05DBP 20039209413.8 ppb
2014-03-06DBP 2003921529.10 ppb
2014-03-06DBP 20039220126.2 ppb
2014-03-06DBP 20039220220.6 ppb
2014-03-07DBP 20039230619.7 ppb
2014-03-07DBP 20039230724.4 ppb
2014-03-07DBP 20039230829.0 ppb
2014-06-02DBP 20039694826.8 ppb
2014-06-02DBP 20039694926.0 ppb
2014-06-02DBP 20039695012.4 ppb
2014-06-03DBP 20039695922.1 ppb
2014-06-03DBP 20039696422.8 ppb
2014-06-03DBP 20039698224.6 ppb
2014-06-03DBP 20039707320.1 ppb
2014-06-05DBP 2003972299.70 ppb
2014-06-05DBP 20039732724.7 ppb
2014-06-05DBP 20039732830.2 ppb
2014-06-06DBP 20039735428.1 ppb
2014-06-06DBP 20039735529.7 ppb
2014-09-02DBP 20040327220.2 ppb
2014-09-02DBP 20040327724.1 ppb
2014-09-02DBP 20040330223.2 ppb
2014-09-03DBP 20040347026.0 ppb
2014-09-03DBP 20040347121.2 ppb
2014-09-03DBP 20040347218.2 ppb
2014-09-04DBP 2004035177.90 ppb
2014-09-04DBP 20040355622.8 ppb
2014-09-04DBP 20040355723.3 ppb
2014-09-04DBP 20040355826.0 ppb
2014-09-06DBP 2004036876.20 ppb
2014-09-06DBP 20040368819.3 ppb
2014-12-02DBP 20040868318.6 ppb
2014-12-02DBP 20040868820.1 ppb
2014-12-02DBP 20040870622.6 ppb
2014-12-02DBP 20040874823.4 ppb
2014-12-02DBP 20040874925.3 ppb
2014-12-02DBP 20040875015.6 ppb
2014-12-03DBP 2004088568.80 ppb
2014-12-03DBP 20040885725.8 ppb
2014-12-04DBP 2004089467.50 ppb
2014-12-04DBP 20040896822.3 ppb
2014-12-04DBP 20040896924.7 ppb
2014-12-04DBP 20040897022.9 ppb
2016-03-01DBP 20043442016.1 ppb
2016-03-01DBP 20043443214.9 ppb
2016-03-01DBP 20043443916.3 ppb
2016-03-01DBP 20043451820.2 ppb
2016-03-02DBP 20043465217.4 ppb
2016-03-02DBP 20043465319.4 ppb
2016-03-03DBP 20043470514.1 ppb
2016-03-03DBP 20043473415.7 ppb
2016-03-03DBP 20043479019.3 ppb
2016-03-03DBP 20043479118.1 ppb
2016-03-04DBP 20043481919.8 ppb
2016-03-04DBP 20043482018.6 ppb
2016-06-01DBP 20044102519.3 ppb
2016-06-01DBP 20044102624.7 ppb
2016-06-01DBP 20044103724.4 ppb
2016-06-01DBP 20044105428.2 ppb
2016-06-01DBP 20044105527.2 ppb
2016-06-01DBP 20044105617.0 ppb
2016-06-01DBP 20044105711.0 ppb
2016-06-01DBP 20044105822.9 ppb
2016-06-02DBP 2004412628.70 ppb
2016-06-02DBP 20044129726.2 ppb
2016-06-02DBP 20044129827.9 ppb
2016-06-02DBP 20044129922.0 ppb
2016-09-06DBP 20044896929.6 ppb
2016-09-06DBP 20044897428.4 ppb
2016-09-06DBP 20044900133.6 ppb
2016-09-06DBP 20044901429.0 ppb
2016-09-06DBP 20044901531.0 ppb
2016-09-06DBP 20044901637.2 ppb
2016-09-07DBP 20044921426.2 ppb
2016-09-08DBP 20044940736.1 ppb
2016-09-08DBP 20044940835.3 ppb
2016-09-09DBP 20044950032.4 ppb
2016-09-12DBP 2004495457.40 ppb
2016-09-12DBP 2004495479.70 ppb
2016-12-05DBP 20045608114.1 ppb
2016-12-05DBP 20045608319.0 ppb
2016-12-06DBP 20045608818.0 ppb
2016-12-06DBP 20045611016.9 ppb
2016-12-06DBP 20045611516.5 ppb
2016-12-06DBP 20045617520.6 ppb
2016-12-07DBP 2004563583.20 ppb
2016-12-07DBP 20045635919.7 ppb
2016-12-08DBP 200456453ND
2016-12-08DBP 20045646018.9 ppb
2016-12-08DBP 20045646117.5 ppb
2016-12-08DBP 20045646210.8 ppb
2017-03-01DBP 20046149623.8 ppb
2017-03-01DBP 20046154223.1 ppb
2017-03-01DBP 20046154326.1 ppb
2017-03-01DBP 20046154422.4 ppb
2017-03-01DBP 20046154527.4 ppb
2017-03-01DBP 20046154620.1 ppb
2017-03-02DBP 20046165022.0 ppb
2017-03-02DBP 20046165124.1 ppb
2017-03-02DBP 20046167326.0 ppb
2017-03-02DBP 20046167425.3 ppb
2017-03-02DBP 2004616757.60 ppb
2017-03-03DBP 2004617276.00 ppb
2017-06-05DBP 20046842016.8 ppb
2017-06-05DBP 20046842124.0 ppb
2017-06-06DBP 20046847618.9 ppb
2017-06-06DBP 20046848118.8 ppb
2017-06-06DBP 20046850023.2 ppb
2017-06-07DBP 20046866910.2 ppb
2017-06-07DBP 20046867022.8 ppb
2017-06-08DBP 2004688507.00 ppb
2017-06-08DBP 20046894624.2 ppb
2017-06-08DBP 20046894724.4 ppb
2017-06-08DBP 20046894819.2 ppb
2017-06-08DBP 20046894915.4 ppb
2017-09-05DBP 20047578524.9 ppb
2017-09-05DBP 20047579027.0 ppb
2017-09-05DBP 20047580029.0 ppb
2017-09-07DBP 2004761045.80 ppb
2017-09-07DBP 20047622030.9 ppb
2017-09-07DBP 20047622130.3 ppb
2017-09-07DBP 20047622228.1 ppb
2017-09-07DBP 20047622427.7 ppb
2017-09-08DBP 20047630230.6 ppb
2017-09-08DBP 20047630429.3 ppb
2017-09-08DBP 20047630525.2 ppb
2017-09-08DBP 2004763065.30 ppb
2017-12-05DBP 20048337623.3 ppb
2017-12-05DBP 20048338123.0 ppb
2017-12-05DBP 20048339129.2 ppb
2017-12-07DBP 20048377024.9 ppb
2017-12-07DBP 20048377127.8 ppb
2017-12-07DBP 20048377224.0 ppb
2017-12-07DBP 20048377312.6 ppb
2017-12-07DBP 20048377432.0 ppb
2017-12-08DBP 20048383411.2 ppb
2017-12-08DBP 20048384325.2 ppb
2017-12-08DBP 20048384427.7 ppb
2017-12-08DBP 20048384526.4 ppb
2018-03-06DBP 20048926836.3 ppb
2018-03-06DBP 20048927545.3 ppb
2018-03-06DBP 20048928738.7 ppb
2018-03-07DBP 20048953717.6 ppb
2018-03-07DBP 20048953837.6 ppb
2018-03-07DBP 20048953938.7 ppb
2018-03-07DBP 20048954039.9 ppb
2018-03-07DBP 20048954134.2 ppb
2018-03-08DBP 20048956515.0 ppb
2018-03-09DBP 20048970138.1 ppb
2018-03-09DBP 20048970239.7 ppb
2018-03-09DBP 20048970328.9 ppb
2018-06-05DBP 20049598422.0 ppb
2018-06-05DBP 20049598923.4 ppb
2018-06-05DBP 20049600223.6 ppb
2018-06-06DBP 20049623521.9 ppb
2018-06-07DBP 20049637521.1 ppb
2018-06-07DBP 20049637625.5 ppb
2018-06-07DBP 20049641713.5 ppb
2018-06-08DBP 20049650727.1 ppb
2018-06-08DBP 20049650823.9 ppb
2018-06-08DBP 20049650924.4 ppb
2018-06-08DBP 20049651027.1 ppb
2018-06-08DBP 20049651124.8 ppb
2018-09-04DBP 20050373221.4 ppb
2018-09-04DBP 20050373722.6 ppb
2018-09-04DBP 20050384220.6 ppb
2018-09-04DBP 20050391223.8 ppb
2018-09-04DBP 20050391324.6 ppb
2018-09-04DBP 20050391422.8 ppb
2018-09-05DBP 20050398118.9 ppb
2018-09-05DBP 20050408618.0 ppb
2018-09-05DBP 20050408712.5 ppb
2018-09-06DBP 2005041859.80 ppb
2018-09-06DBP 20050421120.8 ppb
2018-09-07DBP 20050444122.4 ppb
2018-12-03DBP 20051437210.5 ppb
2018-12-03DBP 20051440622.7 ppb
2018-12-04DBP 20051444722.2 ppb
2018-12-04DBP 20051445223.5 ppb
2018-12-04DBP 20051462525.3 ppb
2018-12-04DBP 20051462619.5 ppb
2018-12-04DBP 20051462723.6 ppb
2018-12-04DBP 20051462822.5 ppb
2018-12-04DBP 20051462921.2 ppb
2018-12-05DBP 20051495221.6 ppb
2018-12-06DBP 20051506921.6 ppb
2018-12-06DBP 20051507027.9 ppb
2019-03-04DBP 20052321513.8 ppb
2019-03-04DBP 20052321718.7 ppb
2019-03-05DBP 20052326216.9 ppb
2019-03-05DBP 20052326918.4 ppb
2019-03-05DBP 20052345619.0 ppb
2019-03-05DBP 20052345726.4 ppb
2019-03-05DBP 20052345818.6 ppb
2019-03-05DBP 20052345917.1 ppb
2019-03-05DBP 2005234639.50 ppb
2019-03-07DBP 20052388417.3 ppb
2019-03-08DBP 20052400014.1 ppb
2019-03-08DBP 20052400220.6 ppb
2019-06-03DBP 20053437315.8 ppb
2019-06-03DBP 20053441411.8 ppb
2019-06-04DBP 20053449114.2 ppb
2019-06-04DBP 20053449615.1 ppb
2019-06-04DBP 20053460015.9 ppb
2019-06-04DBP 20053472512.9 ppb
2019-06-04DBP 20053472717.4 ppb
2019-06-04DBP 20053472920.1 ppb
2019-06-05DBP 20053503918.7 ppb
2019-06-05DBP 20053504115.9 ppb
2019-06-06DBP 20053519715.9 ppb
2019-06-07DBP 20053535715.8 ppb
2019-09-03DBP 20054698819.4 ppb
2019-09-03DBP 20054699319.4 ppb
2019-09-04DBP 2005474009.50 ppb
2019-09-04DBP 20054740222.3 ppb
2019-09-04DBP 20054740321.5 ppb
2019-09-04DBP 20054740418.2 ppb
2019-09-04DBP 20054740519.6 ppb
2019-09-05DBP 2005474609.20 ppb
2019-09-05DBP 20054766721.6 ppb
2019-09-06DBP 20054782621.1 ppb
2019-09-06DBP 20054782721.3 ppb
2019-09-06DBP 20054782820.1 ppb
2019-12-02DBP 20055840521.3 ppb
2019-12-02DBP 20055840617.7 ppb
2019-12-02DBP 20055840718.5 ppb
2019-12-03DBP 20055845416.4 ppb
2019-12-03DBP 20055845918.0 ppb
2019-12-03DBP 20055861217.9 ppb
2019-12-04DBP 20055891616.2 ppb
2019-12-04DBP 20055891716.9 ppb
2019-12-04DBP 2005589199.20 ppb
2019-12-05DBP 20055907316.6 ppb
2019-12-05DBP 20055909814.8 ppb
2019-12-06DBP 20055919515.8 ppb