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EWG's Tap Water Database — 2019 UPDATE

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Trichloroacetic acid

Suburban Water Systems-covina Knolls

NOTE: Suburban Water Systems-covina Knolls purchases water from Covina Irrigating Company which is required to test for trichloroacetic acid. Sample information shown below was taken by Covina Irrigating Company.

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.

 

159

Samples

0

Samples exceeding legal limit (MCL)

109

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201210.5 ppb12121.70 ppb - 22.0 ppb
20138.31 ppb883.70 ppb - 13.0 ppb
201410.7 ppb12122.90 ppb - 23.0 ppb
20153.65 ppb882.20 ppb - 5.40 ppb
20162.66 ppb86ND - 5.10 ppb
20177.44 ppb882.30 ppb - 12.0 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

NOTE: Suburban Water Systems-covina Knolls purchases water from Covina Irrigating Company which is required to test for trichloroacetic acid. Sample information shown below was taken by Covina Irrigating Company.

Date Lab ID Result
2012-04-269588-800-09002.20 ppb
2012-04-269588-801-092510.00 ppb
2012-04-269588-802-0945ND
2012-04-269588-803-1005ND
2012-04-269588-804-091015.0 ppb
2012-04-269588-805-084013.0 ppb
2012-04-269588-806-085014.0 ppb
2012-04-269588-807-082012.0 ppb
2012-07-259588-800-09507.00 ppb
2012-07-259588-801-10007.40 ppb
2012-07-259588-802-10151.30 ppb
2012-07-259588-803-1030ND
2012-07-259588-804-09407.60 ppb
2012-07-259588-805-09106.50 ppb
2012-07-259588-806-09206.90 ppb
2012-07-259588-807-09005.60 ppb
2012-10-249588-800-0940ND
2012-10-249588-801-10051.10 ppb
2012-10-249588-802-1020ND
2012-10-249588-803-1035ND
2012-10-249588-804-0950ND
2012-10-249588-805-0920ND
2012-10-249588-806-09301.40 ppb
2012-10-249588-807-0900ND
2013-01-259588-800-0905ND
2013-01-259588-801-0915ND
2013-01-259588-802-1015ND
2013-01-259588-803-0945ND
2013-03-049588-804-093013.0 ppb
2013-03-049588-805-09105.20 ppb
2013-03-049588-806-092011.0 ppb
2013-03-049588-807-08555.10 ppb
2013-04-259588-800-1440ND
2013-04-259588-801-1500ND
2013-04-259588-802-1515ND
2013-04-259588-803-1530ND
2013-04-259588-804-145012.0 ppb
2013-04-259588-805-14209.50 ppb
2013-04-259588-806-14309.00 ppb
2013-04-259588-807-14008.00 ppb
2013-07-259588-800-0925ND
2013-07-259588-801-0945ND
2013-07-259588-802-1000ND
2013-07-259588-803-1020ND
2013-07-259588-804-093514.0 ppb
2013-07-259588-805-090514.0 ppb
2013-07-259588-806-092015.0 ppb
2013-07-259588-807-084513.0 ppb
2013-10-249588-800-0940ND
2013-10-249588-801-10002.80 ppb
2013-10-249588-802-1010ND
2013-10-249588-803-1025ND
2013-10-249588-804-09502.40 ppb
2013-10-249588-805-09302.40 ppb
2013-10-249588-806-09152.20 ppb
2013-10-249588-807-09051.80 ppb
2014-04-259588-800-0950ND
2014-04-259588-801-1000ND
2014-04-259588-802-1015ND
2014-04-259588-803-1030ND
2014-04-259588-804-0930ND
2014-04-259588-805-09205.00 ppb
2014-04-259588-806-09405.10 ppb
2014-04-259588-807-09105.10 ppb
2014-05-239588-804-08006.90 ppb
2014-07-259588-800-1005ND
2014-07-259588-801-1025ND
2014-07-259588-802-1040ND
2014-07-259588-803-1055ND
2014-07-259588-804-101511.0 ppb
2014-07-259588-805-094513.0 ppb
2014-07-259588-806-095512.0 ppb
2014-07-259588-807-091512.0 ppb
2014-10-249588-800-09159.60 ppb
2014-10-249588-801-093518.0 ppb
2014-10-249588-802-1030ND
2014-10-249588-803-0955ND
2014-10-249588-804-092516.0 ppb
2014-10-249588-805-085515.0 ppb
2014-10-249588-806-090518.0 ppb
2014-10-249588-807-083015.0 ppb
2015-03-199588-804-101541.0 ppb
2015-04-249588-800-0920ND
2015-04-249588-801-0930ND
2015-04-249588-802-0945ND
2015-04-249588-803-0955ND
2015-05-189588-804-12301.10 ppb
2015-05-189588-806-12151.20 ppb
2015-05-189588-807-11401.40 ppb
2015-07-249588-800-09354.30 ppb
2015-07-249588-801-09554.20 ppb
2015-07-249588-802-1005ND
2015-07-249588-803-1015ND
2015-07-249588-804-09453.30 ppb
2015-07-249588-806-09254.80 ppb
2015-07-249588-807-09154.50 ppb
2015-10-239588-801-09354.60 ppb
2015-10-239588-804-09252.50 ppb
2015-10-239588-805-09001.80 ppb
2015-10-239588-806-09102.20 ppb
2015-10-239588-807-08401.90 ppb
2015-12-189588-800-0755ND
2015-12-189588-802-0810ND
2015-12-189588-803-0825ND
2016-01-259588-800-0950ND
2016-01-259588-801-1010ND
2016-01-259588-802-1025ND
2016-01-259588-804-1000ND
2016-01-259588-806-0940ND
2016-01-259588-807-0925ND
2016-04-259588-800-09353.30 ppb
2016-04-259588-801-09553.80 ppb
2016-04-259588-802-10053.00 ppb
2016-04-259588-804-09453.50 ppb
2016-04-259588-805-09202.70 ppb
2016-04-259588-806-09302.50 ppb
2016-04-259588-807-09002.10 ppb
2016-07-259588-800-09553.70 ppb
2016-07-259588-801-10153.80 ppb
2016-07-259588-802-10304.00 ppb
2016-07-259588-804-10053.80 ppb
2016-07-259588-805-09403.50 ppb
2016-07-259588-806-09503.50 ppb
2016-07-259588-807-09303.50 ppb
2016-10-259588-800-10002.00 ppb
2016-10-259588-801-10151.90 ppb
2016-10-259588-802-10301.90 ppb
2016-10-259588-804-10102.00 ppb
2016-10-259588-805-09451.90 ppb
2016-10-259588-806-09501.90 ppb
2016-10-259588-807-09351.90 ppb
2017-01-319588-800-11356.60 ppb
2017-01-319588-804-11456.60 ppb
2017-01-319588-805-11156.60 ppb
2017-01-319588-806-11256.60 ppb
2017-01-319588-807-11006.30 ppb
2017-02-039588-801-08206.10 ppb
2017-02-249588-802-090014.0 ppb
2017-04-259588-800-12208.60 ppb
2017-04-259588-801-10407.30 ppb
2017-04-259588-802-10508.80 ppb
2017-04-259588-804-10308.60 ppb
2017-04-259588-805-10008.80 ppb
2017-04-259588-806-10108.90 ppb
2017-04-259588-807-09409.00 ppb
2017-07-259588-800-10109.20 ppb
2017-07-259588-801-10409.20 ppb
2017-07-259588-802-10558.50 ppb
2017-07-259588-804-10258.60 ppb
2017-07-259588-806-10058.60 ppb
2017-07-259588-807-09558.30 ppb
2017-08-019588-805-091010.00 ppb
2017-10-259588-800-10104.70 ppb
2017-10-259588-801-10254.80 ppb
2017-10-259588-802-10354.80 ppb
2017-10-259588-804-10154.80 ppb
2017-10-259588-805-09554.70 ppb
2017-10-259588-806-10054.60 ppb
2017-10-259588-807-09304.50 ppb