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EWG's Tap Water Database — 2019 UPDATE

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Trichloroacetic acid

City of Hollister

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.

 

70

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND40ND
20140.444 ppb161ND - 7.10 ppb
2015ND160ND
20160.356 ppb185ND - 2.00 ppb
20170.275 ppb163ND - 2.10 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
2013-12-111610-802-1510ND
2013-12-111610-801-1535ND
2013-12-111610-803-1455ND
2013-12-111610-804-1610ND
2014-03-241610-801-17107.10 ppb
2014-03-241610-803-1555ND
2014-03-241610-802-1615ND
2014-03-241610-804-1650ND
2014-06-061610-803-1540ND
2014-06-061610-802-1520ND
2014-06-061610-804-1458ND
2014-06-061610-801-1445ND
2014-10-091610-803-1130ND
2014-10-091610-804-1205ND
2014-10-091610-802-1100ND
2014-10-091610-801-1150ND
2014-12-181610-801-1235ND
2014-12-181610-803-1310ND
2014-12-181610-804-1220ND
2014-12-181610-802-1255ND
2015-04-201610-803-1125ND
2015-04-201610-801-1344ND
2015-04-201610-804-1330ND
2015-04-201610-802-1115ND
2015-07-091610-802-0843ND
2015-07-091610-803-0903ND
2015-07-091610-804-0954ND
2015-07-091610-801-1008ND
2015-09-161610-804-1422ND
2015-09-161610-801-1440ND
2015-09-161610-802-1344ND
2015-09-161610-803-1359ND
2015-11-121610-802-0920ND
2015-11-121610-804-0858ND
2015-11-121610-803-0932ND
2015-11-121610-801-0840ND
2016-03-031610-804-0856ND
2016-03-031610-802-0817ND
2016-03-031610-803-0829ND
2016-03-031610-801-0913ND
2016-06-141610-803-1421ND
2016-06-141610-804-15231.40 ppb
2016-06-141610-801-1442ND
2016-06-141610-802-1428ND
2016-06-291610-804-1123ND
2016-07-071610-804-1237ND
2016-09-221610-801-1155ND
2016-09-221610-804-1205ND
2016-09-221610-802-1110ND
2016-09-221610-803-1100ND
2016-12-145867-803-12372.00 ppb
2016-12-145867-802-12511.000 ppb
2016-12-145867-801-13091.000 ppb
2016-12-145867-804-13161.000 ppb
2017-03-011610-801-1150ND
2017-03-011610-804-1141ND
2017-03-011610-803-1209ND
2017-03-011610-802-1202ND
2017-06-011610-801-12452.10 ppb
2017-06-011610-802-1159ND
2017-06-011610-804-1226ND
2017-06-011610-803-1210ND
2017-09-071610-804-1142ND
2017-09-071610-801-1148ND
2017-09-071610-803-12081.10 ppb
2017-09-071610-802-12021.20 ppb
2017-12-071610-801-0914ND
2017-12-071610-804-0905ND
2017-12-071610-803-0926ND
2017-12-071610-802-0934ND