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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

OSU Water Plant

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)

72

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.329 ppb161ND - 5.27 ppb
20153.26 ppb167ND - 10.3 ppb
20167.67 ppb16164.78 ppb - 29.8 ppb
20176.57 ppb16163.08 ppb - 8.20 ppb
201810.5 ppb16162.73 ppb - 20.0 ppb
201914.3 ppb16167.54 ppb - 23.7 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
2014-01-161271143ND
2014-01-161271141ND
2014-01-161271139ND
2014-01-161271137ND
2014-04-171294495ND
2014-04-171294494ND
2014-04-171294493ND
2014-04-171294492ND
2014-07-241320710ND
2014-07-241320708ND
2014-07-241320712ND
2014-07-241320714ND
2014-12-181359205ND
2014-12-181359204ND
2014-12-181359203ND
2014-12-1813592025.27 ppb
2015-01-151365186ND
2015-01-151365184ND
2015-01-151365182ND
2015-01-151365180ND
2015-05-141395361ND
2015-05-141395366ND
2015-05-141395370ND
2015-05-141395368ND
2015-07-221413102ND
2015-07-2214131009.80 ppb
2015-07-22141309810.3 ppb
2015-07-22141309610.3 ppb
2015-10-0814339235.36 ppb
2015-10-0814339215.40 ppb
2015-10-0814339195.38 ppb
2015-10-0814339145.66 ppb
2016-01-1414593206.97 ppb
2016-01-1414593196.36 ppb
2016-01-1414593216.56 ppb
2016-01-1414593227.47 ppb
2016-04-066D06123-045.78 ppb
2016-04-066D06123-035.45 ppb
2016-04-066D06123-025.37 ppb
2016-04-066D06123-015.44 ppb
2016-07-066G06042-045.47 ppb
2016-07-066G06042-037.88 ppb
2016-07-066G06042-028.62 ppb
2016-07-066G06042-0129.8 ppb
2016-10-106J10043-015.48 ppb
2016-10-106J10043-044.78 ppb
2016-10-106J10043-035.40 ppb
2016-10-106J10043-025.83 ppb
2017-01-057A05080-043.08 ppb
2017-01-057A05080-036.81 ppb
2017-01-057A05080-027.14 ppb
2017-01-057A05080-016.38 ppb
2017-04-047D04104-046.31 ppb
2017-04-047D04104-035.56 ppb
2017-04-047D04104-026.59 ppb
2017-04-047D04104-016.38 ppb
2017-07-107G10070-026.87 ppb
2017-07-107G10070-016.84 ppb
2017-07-107G10070-036.66 ppb
2017-07-107G10070-045.93 ppb
2017-10-037J03043-046.64 ppb
2017-10-037J03043-038.20 ppb
2017-10-037J03043-027.53 ppb
2017-10-037J03043-018.15 ppb
2018-01-088A08061-032.73 ppb
2018-01-088A08061-029.44 ppb
2018-01-088A08061-019.41 ppb
2018-01-088A08024-019.99 ppb
2018-04-03AD03082-019.16 ppb
2018-04-03AD03082-028.24 ppb
2018-04-03AD03082-047.47 ppb
2018-04-03AD03082-038.37 ppb
2018-07-03AG03061-0411.3 ppb
2018-07-03AG03061-0315.9 ppb
2018-07-03AG03061-0219.0 ppb
2018-07-03AG03061-0120.0 ppb
2018-10-02AJ02060-048.55 ppb
2018-10-02AJ02060-0310.2 ppb
2018-10-02AJ02060-029.00 ppb
2018-10-02AJ02060-019.99 ppb
2019-01-04BA04032-028.76 ppb
2019-01-04BA04032-019.00 ppb
2019-01-04BA04032-037.54 ppb
2019-01-04BA04032-048.97 ppb
2019-04-08BD08048-0410.2 ppb
2019-04-08BD08048-0311.8 ppb
2019-04-08BD08048-0210.7 ppb
2019-04-08BD08048-0111.6 ppb
2019-07-26BG26013-0423.7 ppb
2019-07-26BG26013-0320.1 ppb
2019-07-26BG26013-0222.7 ppb
2019-07-26BG26013-0123.4 ppb
2019-10-02BJ02120-0113.8 ppb
2019-10-02BJ02120-0415.4 ppb
2019-10-02BJ02120-0315.6 ppb
2019-10-02BJ02120-0215.6 ppb