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EWG's Tap Water Database — 2021 UPDATE

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Trichloroacetic acid

Mesa Water District

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

 

192

Samples

0

Samples exceeding legal limit (MCL)

40

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.31 ppb3216ND - 5.00 ppb
20150.0781 ppb322ND - 1.40 ppb
2016ND320ND
20170.625 ppb3214ND - 1.70 ppb
20180.200 ppb326ND - 1.20 ppb
20190.106 ppb322ND - 1.70 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
2014-02-119590-801-0755ND
2014-02-119590-802-0810ND
2014-02-119590-803-0825ND
2014-02-119590-804-0950ND
2014-02-119590-805-1020ND
2014-02-119590-806-1140ND
2014-02-119590-807-1150ND
2014-02-119590-808-1205ND
2014-05-139590-801-08152.10 ppb
2014-05-139590-802-08302.40 ppb
2014-05-139590-803-08452.40 ppb
2014-05-139590-804-0940ND
2014-05-139590-805-10102.00 ppb
2014-05-139590-806-11152.00 ppb
2014-05-139590-807-11252.30 ppb
2014-05-139590-808-11402.00 ppb
2014-08-149590-801-09554.30 ppb
2014-08-149590-802-10102.20 ppb
2014-08-149590-803-10251.10 ppb
2014-08-149590-804-1140ND
2014-08-149590-805-12105.00 ppb
2014-08-149590-806-13253.30 ppb
2014-08-149590-807-13353.70 ppb
2014-08-149590-808-13554.60 ppb
2014-11-129590-801-0825ND
2014-11-129590-802-0835ND
2014-11-129590-803-0850ND
2014-11-129590-804-1000ND
2014-11-129590-805-1035ND
2014-11-129590-806-11551.30 ppb
2014-11-129590-807-12051.30 ppb
2014-11-129590-808-1220ND
2015-02-109590-801-0915ND
2015-02-109590-802-0935ND
2015-02-109590-803-0955ND
2015-02-109590-804-1040ND
2015-02-109590-805-1100ND
2015-02-109590-806-1110ND
2015-02-109590-807-1120ND
2015-02-109590-808-1130ND
2015-05-129590-801-0830ND
2015-05-129590-802-0845ND
2015-05-129590-803-0900ND
2015-05-129590-804-1015ND
2015-05-129590-805-10451.40 ppb
2015-05-129590-806-1155ND
2015-05-129590-807-1210ND
2015-05-129590-808-1225ND
2015-08-119590-801-0820ND
2015-08-119590-802-0835ND
2015-08-119590-803-0850ND
2015-08-119590-804-0855ND
2015-08-119590-805-10451.10 ppb
2015-08-119590-806-1110ND
2015-08-119590-807-1120ND
2015-08-119590-808-1130ND
2015-11-109590-801-0905ND
2015-11-109590-802-0855ND
2015-11-109590-803-0840ND
2015-11-109590-804-0920ND
2015-11-109590-805-0940ND
2015-11-109590-806-0820ND
2015-11-109590-807-0810ND
2015-11-109590-808-0755ND
2016-02-099590-801-0935ND
2016-02-099590-802-0920ND
2016-02-099590-803-0905ND
2016-02-099590-804-0950ND
2016-02-099590-805-0845ND
2016-02-099590-806-0805ND
2016-02-099590-807-0820ND
2016-02-099590-808-0750ND
2016-05-109590-801-0810ND
2016-05-109590-802-0825ND
2016-05-109590-803-0755ND
2016-05-109590-804-0740ND
2016-05-109590-805-0845ND
2016-05-109590-806-0905ND
2016-05-109590-807-0915ND
2016-05-109590-808-0930ND
2016-08-099590-801-0940ND
2016-08-099590-802-0930ND
2016-08-099590-803-0915ND
2016-08-099590-804-0905ND
2016-08-099590-805-0845ND
2016-08-099590-806-0830ND
2016-08-099590-807-0815ND
2016-08-099590-808-0800ND
2016-11-089590-801-0730ND
2016-11-089590-802-0745ND
2016-11-089590-803-0755ND
2016-11-089590-804-0805ND
2016-11-089590-805-0820ND
2016-11-089590-806-0835ND
2016-11-089590-807-0845ND
2016-11-089590-808-0855ND
2017-02-149590-801-1045ND
2017-02-149590-802-1030ND
2017-02-149590-803-1005ND
2017-02-149590-804-1015ND
2017-02-149590-805-0910ND
2017-02-149590-806-0930ND
2017-02-149590-807-0945ND
2017-02-149590-808-0955ND
2017-05-089590-801-0845ND
2017-05-089590-802-1030ND
2017-05-089590-803-1015ND
2017-05-089590-804-1000ND
2017-05-089590-805-1100ND
2017-05-089590-806-1115ND
2017-05-089590-807-1045ND
2017-05-089590-808-1100ND
2017-08-089590-801-08301.10 ppb
2017-08-089590-802-0835ND
2017-08-089590-803-08451.40 ppb
2017-08-089590-804-09251.20 ppb
2017-08-089590-805-10401.50 ppb
2017-08-089590-806-11001.70 ppb
2017-08-089590-807-11151.60 ppb
2017-08-089590-808-11251.20 ppb
2017-11-149590-801-10301.50 ppb
2017-11-149590-802-10151.50 ppb
2017-11-149590-803-09451.40 ppb
2017-11-149590-804-1000ND
2017-11-149590-805-09301.50 ppb
2017-11-149590-806-08451.50 ppb
2017-11-149590-807-08301.50 ppb
2017-11-149590-808-08151.40 ppb
2018-02-139590-801-08101.20 ppb
2018-02-139590-802-08251.10 ppb
2018-02-139590-803-08351.000 ppb
2018-02-139590-804-08501.10 ppb
2018-02-139590-805-0905ND
2018-02-139590-806-09201.000 ppb
2018-02-139590-807-09301.000 ppb
2018-02-139590-808-0945ND
2018-05-089590-801-1105ND
2018-05-089590-802-1050ND
2018-05-089590-803-1040ND
2018-05-089590-804-1030ND
2018-05-089590-805-0820ND
2018-05-089590-806-0805ND
2018-05-089590-807-0755ND
2018-05-089590-808-0740ND
2018-08-149588-801-0800ND
2018-08-149588-802-0810ND
2018-08-149588-803-0820ND
2018-08-149588-804-0830ND
2018-08-149588-805-0840ND
2018-08-149588-806-0850ND
2018-08-149588-807-0900ND
2018-08-149588-808-0910ND
2018-11-149588-801-0810ND
2018-11-149588-802-0825ND
2018-11-149588-803-0845ND
2018-11-149588-804-0905ND
2018-11-149588-805-0920ND
2018-11-149588-806-0935ND
2018-11-149588-807-0945ND
2018-11-149588-808-1000ND
2019-02-129588-801-0945ND
2019-02-129588-802-10001.70 ppb
2019-02-129588-803-10101.70 ppb
2019-02-129588-804-1020ND
2019-02-129588-805-1030ND
2019-02-129588-806-1045ND
2019-02-129588-807-1055ND
2019-02-129588-808-1110ND
2019-05-079588-801-0830ND
2019-05-079588-802-0845ND
2019-05-079588-803-0855ND
2019-05-079588-804-0910ND
2019-05-079588-805-0920ND
2019-05-079588-806-0930ND
2019-05-079588-807-0940ND
2019-05-079588-808-0950ND
2019-08-139588-801-0830ND
2019-08-139588-802-0845ND
2019-08-139588-803-0900ND
2019-08-139588-804-0915ND
2019-08-139588-805-1045ND
2019-08-139588-806-1115ND
2019-08-139588-807-1125ND
2019-08-139588-808-1145ND
2019-11-139588-801-0905ND
2019-11-139588-802-0915ND
2019-11-139588-803-0925ND
2019-11-139588-804-0935ND
2019-11-139588-805-0905ND
2019-11-139588-806-0940ND
2019-11-139588-807-0950ND
2019-11-139588-808-1010ND