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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

St John's Water

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)

58

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.04 ppb167ND - 3.60 ppb
20155.11 ppb16161.23 ppb - 17.7 ppb
20161.68 ppb1612ND - 3.20 ppb
20171.51 ppb1611ND - 4.09 ppb
20180.588 ppb167ND - 1.81 ppb
20190.558 ppb165ND - 2.17 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
2014-01-082140109-31ND
2014-01-082140109-32ND
2014-01-082140109-33ND
2014-01-082140109-30ND
2014-04-032140404-2ND
2014-04-032140404-31.14 ppb
2014-04-032140404-4ND
2014-04-032140404-5ND
2014-07-012140702-261.22 ppb
2014-07-012140702-271.10 ppb
2014-07-012140702-28ND
2014-07-012140702-29ND
2014-10-082141009-33.15 ppb
2014-10-082141009-53.60 ppb
2014-10-082141009-43.55 ppb
2014-10-082141009-22.92 ppb
2015-01-072150108-21.23 ppb
2015-01-072150108-31.75 ppb
2015-01-072150108-41.97 ppb
2015-01-072150108-51.70 ppb
2015-04-022150406-213.5 ppb
2015-04-022150406-33.42 ppb
2015-04-022150406-417.7 ppb
2015-04-022150406-517.4 ppb
2015-07-082150710-31.78 ppb
2015-07-082150710-51.74 ppb
2015-07-082150710-41.72 ppb
2015-07-082150710-21.76 ppb
2015-10-142151015-335.48 ppb
2015-10-142151015-343.93 ppb
2015-10-142151015-354.54 ppb
2015-10-142151015-322.07 ppb
2016-01-062160107-352.39 ppb
2016-01-062160107-343.20 ppb
2016-01-062160107-332.62 ppb
2016-01-062160107-32ND
2016-04-062160407-42.42 ppb
2016-04-062160407-52.73 ppb
2016-04-282160407-32.49 ppb
2016-04-282160429-221.42 ppb
2016-07-072160708-181.43 ppb
2016-07-072160708-191.68 ppb
2016-07-072160708-201.85 ppb
2016-07-072160708-211.83 ppb
2016-10-312161101-12ND
2016-10-312161101-13ND
2016-10-312161101-14ND
2016-10-312161101-152.89 ppb
2017-01-052170106-151.35 ppb
2017-01-052170106-12ND
2017-01-052170106-131.34 ppb
2017-01-052170106-141.28 ppb
2017-04-062170407-29ND
2017-04-062170407-30ND
2017-04-062170407-31ND
2017-04-062170407-32ND
2017-07-062170707-541.83 ppb
2017-07-062170707-532.13 ppb
2017-07-062170707-521.95 ppb
2017-07-062170707-511.94 ppb
2017-10-032171005-331.17 ppb
2017-10-032171005-344.09 ppb
2017-10-032171005-353.45 ppb
2017-10-032171005-363.67 ppb
2018-01-092180111-141.10 ppb
2018-01-092180111-131.06 ppb
2018-01-092180111-12ND
2018-01-092180111-111.28 ppb
2018-04-052180406-17ND
2018-04-052180406-14ND
2018-04-052180406-15ND
2018-04-052180406-16ND
2018-07-032180706-59ND
2018-07-032180706-58ND
2018-07-032180706-57ND
2018-07-032180706-561.11 ppb
2018-10-042181005-42ND
2018-10-042181005-431.72 ppb
2018-10-042181005-441.33 ppb
2018-10-042181005-451.81 ppb
2019-01-082190110-421.29 ppb
2019-01-082190110-432.16 ppb
2019-01-082190110-442.15 ppb
2019-01-082190110-452.17 ppb
2019-04-042190405-62ND
2019-04-042190405-65ND
2019-04-042190405-64ND
2019-04-042190405-631.15 ppb
2019-07-022190703-43ND
2019-07-022190703-45ND
2019-07-022190703-44ND
2019-07-022190703-42ND
2019-10-032191004-63ND
2019-10-032191004-62ND
2019-10-032191004-61ND
2019-10-032191004-60ND