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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

Pasadena

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

 

184

Samples

0

Samples exceeding legal limit (MCL)

117

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20143.24 ppb3227ND - 6.30 ppb
20152.09 ppb3223ND - 4.70 ppb
20161.81 ppb3221ND - 9.00 ppb
20172.81 ppb3219ND - 11.0 ppb
20180.672 ppb3210ND - 3.80 ppb
20191.10 ppb2417ND - 2.00 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
2014-03-129590-800-10064.20 ppb
2014-03-129590-801-0900ND
2014-03-129590-802-10584.50 ppb
2014-03-129590-803-10452.60 ppb
2014-03-129590-804-11144.60 ppb
2014-03-129590-805-09203.30 ppb
2014-03-129590-806-09523.00 ppb
2014-03-129590-807-08403.90 ppb
2014-06-109590-800-08005.10 ppb
2014-06-109590-801-08001.10 ppb
2014-06-109590-802-08006.20 ppb
2014-06-109590-803-08005.10 ppb
2014-06-109590-804-08006.30 ppb
2014-06-109590-805-0800ND
2014-06-109590-806-08006.10 ppb
2014-06-109590-807-08005.60 ppb
2014-09-179590-800-09404.50 ppb
2014-09-179590-801-10473.50 ppb
2014-09-179590-802-11274.60 ppb
2014-09-179590-803-11143.60 ppb
2014-09-179590-804-1146ND
2014-09-179590-805-10263.70 ppb
2014-09-179590-806-09553.60 ppb
2014-09-179590-807-09103.60 ppb
2014-12-179590-800-09502.50 ppb
2014-12-179590-801-0920ND
2014-12-179590-802-08302.50 ppb
2014-12-179590-803-0908ND
2014-12-179590-804-09502.40 ppb
2014-12-179590-805-08502.40 ppb
2014-12-179590-806-10102.70 ppb
2014-12-179590-807-08102.40 ppb
2015-03-189590-800-08362.00 ppb
2015-03-189590-801-07562.20 ppb
2015-03-189590-802-09301.90 ppb
2015-03-189590-803-09152.40 ppb
2015-03-189590-804-09401.30 ppb
2015-03-189590-805-08172.50 ppb
2015-03-189590-806-08502.50 ppb
2015-03-189590-807-07382.40 ppb
2015-06-189590-800-10153.60 ppb
2015-06-189590-801-08452.80 ppb
2015-06-189590-802-0927ND
2015-06-189590-803-0858ND
2015-06-189590-804-0950ND
2015-06-189590-805-09153.70 ppb
2015-06-189590-806-09453.60 ppb
2015-06-189590-807-08152.70 ppb
2015-09-169590-800-11044.60 ppb
2015-09-169590-801-08352.80 ppb
2015-09-169590-802-1152ND
2015-09-169590-803-1200ND
2015-09-169590-804-1130ND
2015-09-169590-805-09104.50 ppb
2015-09-169590-806-10334.70 ppb
2015-09-169590-807-08064.30 ppb
2015-12-099590-800-09262.20 ppb
2015-12-099590-801-10142.30 ppb
2015-12-099590-802-1054ND
2015-12-099590-803-1110ND
2015-12-099590-804-1041ND
2015-12-099590-805-09152.60 ppb
2015-12-099590-806-09102.60 ppb
2015-12-099590-807-08112.80 ppb
2016-03-029590-800-10151.80 ppb
2016-03-029590-801-08341.60 ppb
2016-03-029590-802-09161.80 ppb
2016-03-029590-803-0928ND
2016-03-029590-804-09001.70 ppb
2016-03-029590-805-09151.30 ppb
2016-03-029590-806-09522.00 ppb
2016-03-029590-807-08101.90 ppb
2016-06-159590-800-09103.50 ppb
2016-06-159590-801-10361.50 ppb
2016-06-159590-802-10052.30 ppb
2016-06-159590-803-10302.60 ppb
2016-06-159590-804-09402.70 ppb
2016-06-159590-805-10004.30 ppb
2016-06-159590-806-08574.30 ppb
2016-06-159590-807-08003.20 ppb
2016-09-219590-800-0936ND
2016-09-219590-801-1108ND
2016-09-219590-802-0820ND
2016-09-219590-803-0910ND
2016-09-219590-804-0845ND
2016-09-219590-805-1040ND
2016-09-219590-806-0913ND
2016-09-219590-807-08029.00 ppb
2016-12-079590-800-13561.80 ppb
2016-12-079590-801-13073.00 ppb
2016-12-079590-802-1219ND
2016-12-079590-803-1231ND
2016-12-079590-804-1205ND
2016-12-079590-805-13261.90 ppb
2016-12-079590-806-13451.80 ppb
2016-12-079590-807-12513.80 ppb
2017-03-089588-800-10307.40 ppb
2017-03-089588-801-08526.80 ppb
2017-03-089588-802-08523.70 ppb
2017-03-089588-803-08324.10 ppb
2017-03-089588-804-09083.80 ppb
2017-03-089588-805-09208.10 ppb
2017-03-089588-806-10498.10 ppb
2017-03-089588-807-082011.0 ppb
2017-06-149588-800-10002.80 ppb
2017-06-149588-801-0846ND
2017-06-149588-802-1018ND
2017-06-149588-803-0946ND
2017-06-149588-804-1049ND
2017-06-149588-805-09402.60 ppb
2017-06-149588-806-10182.50 ppb
2017-06-149588-807-08102.50 ppb
2017-09-139588-800-09574.70 ppb
2017-09-139588-801-08501.60 ppb
2017-09-139588-802-0915ND
2017-09-139588-803-0850ND
2017-09-139588-804-0940ND
2017-09-139588-805-09204.60 ppb
2017-09-139588-806-10184.50 ppb
2017-09-139588-807-08307.80 ppb
2017-12-139588-800-1015ND
2017-12-139588-801-12452.00 ppb
2017-12-139588-802-1050ND
2017-12-139588-803-1127ND
2017-12-139588-804-1030ND
2017-12-139588-805-1150ND
2017-12-139588-806-1035ND
2017-12-139588-807-13481.40 ppb
2018-03-219588-800-1249ND
2018-03-219588-801-1027ND
2018-03-219588-802-1040ND
2018-03-219588-803-1020ND
2018-03-219588-804-1100ND
2018-03-219588-805-1119ND
2018-03-219588-806-1317ND
2018-03-219588-807-1414ND
2018-06-139588-800-12003.80 ppb
2018-06-139588-801-09502.00 ppb
2018-06-139588-802-1110ND
2018-06-139588-803-1150ND
2018-06-139588-804-1100ND
2018-06-139588-805-10553.50 ppb
2018-06-139588-806-11403.60 ppb
2018-06-139588-807-12353.30 ppb
2018-09-129588-800-10001.10 ppb
2018-09-129588-801-1120ND
2018-09-129588-802-09291.000 ppb
2018-09-129588-803-0921ND
2018-09-129588-804-09501.20 ppb
2018-09-129588-805-1145ND
2018-09-129588-806-09451.000 ppb
2018-09-129588-807-1045ND
2018-12-129588-800-1120ND
2018-12-129588-801-0945ND
2018-12-129588-802-1015ND
2018-12-129588-803-0950ND
2018-12-129588-804-1040ND
2018-12-129588-805-10251.000 ppb
2018-12-129588-806-1145ND
2018-12-129588-807-0855ND
2019-02-279588-800-10071.20 ppb
2019-02-279588-801-1120ND
2019-02-279588-802-1015ND
2019-02-279588-803-1000ND
2019-02-279588-804-10401.20 ppb
2019-02-279588-805-09391.70 ppb
2019-02-279588-806-10421.30 ppb
2019-02-279588-807-08301.10 ppb
2019-04-039588-800-11231.60 ppb
2019-04-039588-801-09231.60 ppb
2019-04-039588-802-12341.30 ppb
2019-04-039588-803-1311ND
2019-04-039588-804-12491.30 ppb
2019-04-039588-805-10231.60 ppb
2019-04-039588-806-11491.60 ppb
2019-04-039588-807-12211.80 ppb
2019-07-109588-800-10151.90 ppb
2019-07-109588-801-09301.40 ppb
2019-07-109588-802-1023ND
2019-07-109588-803-1121ND
2019-07-109588-804-1045ND
2019-07-109588-805-11101.90 ppb
2019-07-109588-806-10302.00 ppb
2019-07-109588-807-08201.90 ppb