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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

St John Water District 1

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

 

216

Samples

0

Samples exceeding legal limit (MCL)

194

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201410.3 ppb5648ND - 25.6 ppb
20159.66 ppb32321.20 ppb - 15.3 ppb
20169.66 ppb3228ND - 22.6 ppb
201711.6 ppb3228ND - 21.1 ppb
201816.2 ppb323210.8 ppb - 21.2 ppb
201913.5 ppb3226ND - 18.9 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
2014-03-05201168804ND
2014-03-05201168805ND
2014-03-052011688064.20 ppb
2014-03-052011688084.50 ppb
2014-03-052011688094.60 ppb
2014-03-052011688104.60 ppb
2014-03-052011688113.40 ppb
2014-03-052011988073.90 ppb
2014-03-05201168804ND
2014-03-05201168805ND
2014-03-052011688064.20 ppb
2014-03-052011688084.50 ppb
2014-03-052011688094.60 ppb
2014-03-052011688104.60 ppb
2014-03-052011688113.40 ppb
2014-03-052011988073.90 ppb
2014-06-0420474300115.0 ppb
2014-06-042047430029.10 ppb
2014-06-0420474300313.5 ppb
2014-06-0420474300412.2 ppb
2014-06-04204746001ND
2014-06-04204746002ND
2014-06-0420474600313.0 ppb
2014-06-0420474600411.5 ppb
2014-06-0420474300115.0 ppb
2014-06-042047430029.10 ppb
2014-06-0420474300313.5 ppb
2014-06-0420474300412.2 ppb
2014-06-04204746001ND
2014-06-04204746002ND
2014-06-0420474600313.0 ppb
2014-06-0420474600411.5 ppb
2014-08-272086010019.10 ppb
2014-08-272086010029.10 ppb
2014-08-272086010034.40 ppb
2014-08-272086010048.70 ppb
2014-08-272086010019.10 ppb
2014-08-272086010029.10 ppb
2014-08-272086010034.40 ppb
2014-08-272086010048.70 ppb
2014-09-1820957300120.4 ppb
2014-09-1820957300223.1 ppb
2014-09-1820957300323.8 ppb
2014-09-1820957300425.6 ppb
2014-09-1820957300120.4 ppb
2014-09-1820957300223.1 ppb
2014-09-1820957300323.8 ppb
2014-09-1820957300425.6 ppb
2014-12-10201352600112.3 ppb
2014-12-10201352600218.4 ppb
2014-12-10201352600319.5 ppb
2014-12-10201352600414.1 ppb
2014-12-10201352600112.3 ppb
2014-12-10201352600218.4 ppb
2014-12-10201352600319.5 ppb
2014-12-10201352600414.1 ppb
2015-03-05201673600112.9 ppb
2015-03-0520167360029.20 ppb
2015-03-05201673600311.9 ppb
2015-03-0520617360049.10 ppb
2015-03-05201673600112.9 ppb
2015-03-0520167360029.20 ppb
2015-03-05201673600311.9 ppb
2015-03-0520617360049.10 ppb
2015-06-04202089300114.2 ppb
2015-06-04202089300214.9 ppb
2015-06-04202089300315.3 ppb
2015-06-0420208930046.50 ppb
2015-06-04202089300114.2 ppb
2015-06-04202089300214.9 ppb
2015-06-04202089300315.3 ppb
2015-06-0420208930046.50 ppb
2015-09-0220250960011.20 ppb
2015-09-0220250960027.80 ppb
2015-09-0220250960037.00 ppb
2015-09-0220250960046.90 ppb
2015-09-0220250960011.20 ppb
2015-09-0220250960027.80 ppb
2015-09-0220250960037.00 ppb
2015-09-0220250960046.90 ppb
2015-12-09202982800111.3 ppb
2015-12-0920298280029.50 ppb
2015-12-0920298280039.50 ppb
2015-12-0920298280047.40 ppb
2015-12-09202982800111.3 ppb
2015-12-0920298280029.50 ppb
2015-12-0920298280039.50 ppb
2015-12-0920298280047.40 ppb
2016-03-0720335120015.70 ppb
2016-03-0720335120024.90 ppb
2016-03-0720335120035.00 ppb
2016-03-0720335120045.40 ppb
2016-03-0720335120015.70 ppb
2016-03-0720335120024.90 ppb
2016-03-0720335120035.00 ppb
2016-03-0720335120045.40 ppb
2016-06-08203792600113.1 ppb
2016-06-08203792600214.3 ppb
2016-06-08203792600311.9 ppb
2016-06-08203792600413.9 ppb
2016-06-08203792600113.1 ppb
2016-06-08203792600214.3 ppb
2016-06-08203792600311.9 ppb
2016-06-08203792600413.9 ppb
2016-09-142042676001ND
2016-09-14204267600219.0 ppb
2016-09-14204267600322.6 ppb
2016-09-142042676004ND
2016-09-142042676001ND
2016-09-14204267600219.0 ppb
2016-09-14204267600322.6 ppb
2016-09-142042676004ND
2016-12-0720470370019.80 ppb
2016-12-0720470510019.80 ppb
2016-12-0720470560019.70 ppb
2016-12-0720470580019.50 ppb
2016-12-0720470370019.80 ppb
2016-12-0720470510019.80 ppb
2016-12-0720470560019.70 ppb
2016-12-0720470580019.50 ppb
2017-03-10353001530019.20 ppb
2017-03-10353001530029.50 ppb
2017-03-10353001530039.00 ppb
2017-03-1035300153004ND
2017-03-10353001530019.20 ppb
2017-03-10353001530029.50 ppb
2017-03-10353001530039.00 ppb
2017-03-1035300153004ND
2017-06-223532023100918.8 ppb
2017-06-223532023101021.1 ppb
2017-06-223532023101119.4 ppb
2017-06-223532023101219.9 ppb
2017-06-223532023100918.8 ppb
2017-06-223532023101021.1 ppb
2017-06-223532023101119.4 ppb
2017-06-223532023101219.9 ppb
2017-09-213533739500112.0 ppb
2017-09-213533739500212.6 ppb
2017-09-213533739500312.1 ppb
2017-09-2135337395004ND
2017-09-213533739500112.0 ppb
2017-09-213533739500212.6 ppb
2017-09-213533739500312.1 ppb
2017-09-2135337395004ND
2017-12-143536355000110.3 ppb
2017-12-143536355000210.1 ppb
2017-12-143536355000311.4 ppb
2017-12-143536355000410.00 ppb
2017-12-143536355000110.3 ppb
2017-12-143536355000210.1 ppb
2017-12-143536355000311.4 ppb
2017-12-143536355000410.00 ppb
2018-03-153538054000118.2 ppb
2018-03-153538054000220.5 ppb
2018-03-153538054000318.7 ppb
2018-03-153538054000419.1 ppb
2018-03-153538054000118.2 ppb
2018-03-153538054000220.5 ppb
2018-03-153538054000318.7 ppb
2018-03-153538054000419.1 ppb
2018-06-143539865200119.7 ppb
2018-06-143539865200221.0 ppb
2018-06-143539865200321.2 ppb
2018-06-143539865200421.1 ppb
2018-06-143539865200119.7 ppb
2018-06-143539865200221.0 ppb
2018-06-143539865200321.2 ppb
2018-06-143539865200421.1 ppb
2018-09-063541614300112.1 ppb
2018-09-063541614300212.5 ppb
2018-09-063541614300312.5 ppb
2018-09-063541614300412.7 ppb
2018-09-063541614300112.1 ppb
2018-09-063541614300212.5 ppb
2018-09-063541614300312.5 ppb
2018-09-063541614300412.7 ppb
2018-12-103543635700110.8 ppb
2018-12-103543635700217.3 ppb
2018-12-103543635700311.6 ppb
2018-12-103543635700410.8 ppb
2018-12-103543635700110.8 ppb
2018-12-103543635700217.3 ppb
2018-12-103543635700311.6 ppb
2018-12-103543635700410.8 ppb
2019-03-133545455700115.3 ppb
2019-03-133545455700215.5 ppb
2019-03-133545455700314.6 ppb
2019-03-1335454557004ND
2019-03-133545455700115.3 ppb
2019-03-133545455700215.5 ppb
2019-03-133545455700314.6 ppb
2019-03-1335454557004ND
2019-06-113547528800117.3 ppb
2019-06-113547528800216.6 ppb
2019-06-113547528800316.6 ppb
2019-06-1135475288004ND
2019-06-113547528800117.3 ppb
2019-06-113547528800216.6 ppb
2019-06-113547528800316.6 ppb
2019-06-1135475288004ND
2019-09-123549758900118.3 ppb
2019-09-123549758900218.7 ppb
2019-09-123549758900318.4 ppb
2019-09-123549758900418.9 ppb
2019-09-123549758900118.3 ppb
2019-09-123549758900218.7 ppb
2019-09-123549758900318.4 ppb
2019-09-123549758900418.9 ppb
2019-12-093551759100114.4 ppb
2019-12-093551759100214.5 ppb
2019-12-093551759100316.1 ppb
2019-12-0935517591004ND
2019-12-093551759100114.4 ppb
2019-12-093551759100214.5 ppb
2019-12-093551759100316.1 ppb
2019-12-0935517591004ND