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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

San Gabriel County WD

Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid. Read More.

Haloacetic acids are harmful during pregnancy and may increase the risk of cancer. Haloacetic acids are� genotoxic, which means that they induce mutations and DNA damage. Multiple studies by the National Toxicology Program have demonstrated the cancer-causing properties of individual haloacetic acids in laboratory animals. The Department of Health and Human Services is currently considering listing di- or tri-haloacetic acids for possible inclusion in its comprehensive Report on Carcinogens.

Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

96

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.256 ppb163ND - 1.60 ppb
20150.213 ppb163ND - 1.20 ppb
20160.138 ppb162ND - 1.10 ppb
2017ND160ND
2018ND160ND
2019ND160ND

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 the group of five haloacetic acids, or HAA5, was defined in a peer-reviewed scientific study by EWG and represents a one-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 60 ppb

The legal limit for the group of five haloacetic acids (HAA5), established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer and harm to the developing fetus due to exposure to haloacetic acids.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-239588-802-0845ND
2014-01-239588-800-0900ND
2014-01-239588-801-13001.60 ppb
2014-01-239588-803-1225ND
2014-04-229588-803-1045ND
2014-04-229588-802-0830ND
2014-04-229588-801-1200ND
2014-04-229588-800-0840ND
2014-07-239588-803-0905ND
2014-07-239588-802-0830ND
2014-07-239588-801-0845ND
2014-07-239588-800-0820ND
2014-10-239588-802-0850ND
2014-10-239588-801-12151.30 ppb
2014-10-239588-803-12001.20 ppb
2014-10-239588-800-0905ND
2015-01-239588-803-11301.10 ppb
2015-01-239588-802-0820ND
2015-01-239588-801-12051.20 ppb
2015-01-239588-800-0830ND
2015-04-229588-803-1120ND
2015-04-229588-802-0815ND
2015-04-229588-800-0830ND
2015-04-229588-801-1135ND
2015-07-239588-800-0835ND
2015-07-239588-803-11401.10 ppb
2015-07-239588-802-0820ND
2015-07-239588-801-1205ND
2015-10-269588-801-1150ND
2015-10-269588-800-0830ND
2015-10-269588-803-1135ND
2015-10-269588-802-0820ND
2016-01-269588-801-12101.10 ppb
2016-01-269588-800-0850ND
2016-01-269588-803-11551.10 ppb
2016-01-269588-802-0840ND
2016-04-229588-801-1210ND
2016-04-229588-800-0840ND
2016-04-229588-803-1135ND
2016-04-229588-802-0820ND
2016-07-269588-803-1110ND
2016-07-269588-801-1125ND
2016-07-269588-800-0835ND
2016-07-269588-802-0825ND
2016-10-269588-803-1150ND
2016-10-269588-801-1205ND
2016-10-269588-802-0845ND
2016-10-269588-800-0900ND
2017-01-249588-802-0835ND
2017-01-249588-803-1150ND
2017-01-249588-801-1210ND
2017-01-249588-800-0850ND
2017-04-249588-802-1345ND
2017-04-249588-800-1355ND
2017-04-249588-801-1330ND
2017-04-249588-803-1315ND
2017-07-279588-800-1405ND
2017-07-279588-801-1330ND
2017-07-279588-803-1315ND
2017-07-279588-802-1345ND
2017-10-249588-803-1145ND
2017-10-249588-800-0840ND
2017-10-249588-802-0830ND
2017-10-249588-801-1210ND
2018-01-249588-803-1100ND
2018-01-249588-800-0900ND
2018-01-249588-801-1115ND
2018-01-249588-802-0850ND
2018-04-249588-801-1240ND
2018-04-249588-802-0830ND
2018-04-249588-803-1130ND
2018-04-249588-800-0840ND
2018-07-249588-801-1135ND
2018-07-249588-803-1115ND
2018-07-249588-802-0810ND
2018-07-249588-800-0820ND
2018-10-239588-801-1150ND
2018-10-239588-803-1125ND
2018-10-239588-802-0825ND
2018-10-239588-800-0835ND
2019-01-249588-800-0920ND
2019-01-249588-802-1315ND
2019-01-249588-801-1315ND
2019-01-249588-803-1245ND
2019-04-239588-800-0830ND
2019-04-239588-802-0820ND
2019-04-239588-803-1135ND
2019-04-239588-801-1150ND
2019-07-239588-803-1015ND
2019-07-239588-802-0755ND
2019-07-239588-800-0810ND
2019-07-239588-801-0930ND
2019-10-239588-803-1150ND
2019-10-239588-802-0820ND
2019-10-239588-800-0830ND
2019-10-239588-801-1205ND