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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Golden State Water Company (GSWC) - South Arcadia

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
2013N/A00N/A
20140.150 ppb162ND - 1.30 ppb
20150.450 ppb163ND - 3.50 ppb
20160.206 ppb163ND - 1.20 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
2014-01-239588-802-0800ND
2014-01-239588-800-0835ND
2014-01-239588-801-0810ND
2014-01-239588-803-0820ND
2014-04-229588-803-08001.30 ppb
2014-04-229588-802-0740ND
2014-04-229588-801-0750ND
2014-04-229588-800-0815ND
2014-07-239588-803-0735ND
2014-07-239588-802-0705ND
2014-07-239588-801-0720ND
2014-07-239588-800-0750ND
2014-10-239588-802-0800ND
2014-10-239588-801-0810ND
2014-10-239588-803-08201.10 ppb
2014-10-239588-800-0835ND
2015-01-239588-803-0750ND
2015-01-239588-802-0730ND
2015-01-239588-801-0740ND
2015-01-239588-800-0805ND
2015-04-229588-803-07501.10 ppb
2015-04-229588-802-0730ND
2015-04-229588-800-0800ND
2015-04-229588-801-0740ND
2015-07-239588-800-0805ND
2015-07-239588-803-07553.50 ppb
2015-07-239588-802-07352.60 ppb
2015-07-239588-801-0745ND
2015-10-269588-801-0740ND
2015-10-269588-800-0805ND
2015-10-269588-803-0750ND
2015-10-269588-802-0730ND
2016-01-269588-801-0800ND
2016-01-269588-800-0825ND
2016-01-269588-803-0810ND
2016-01-269588-802-07501.10 ppb
2016-04-229588-801-0740ND
2016-04-229588-800-0805ND
2016-04-229588-803-07501.000 ppb
2016-04-229588-802-0730ND
2016-07-269588-803-07551.20 ppb
2016-07-269588-801-0740ND
2016-07-269588-800-0810ND
2016-07-269588-802-0730ND
2016-10-269588-803-0820ND
2016-10-269588-801-0810ND
2016-10-269588-802-0800ND
2016-10-269588-800-0830ND
2017-01-249588-802-0740ND
2017-01-249588-803-0800ND
2017-01-249588-801-0750ND
2017-01-249588-800-0815ND
2017-04-249588-802-0855ND
2017-04-249588-800-0940ND
2017-04-249588-801-0905ND
2017-04-249588-803-0925ND
2017-07-279588-800-1435ND
2017-07-279588-801-1515ND
2017-07-279588-803-1450ND
2017-07-279588-802-1530ND
2017-10-249588-803-0755ND
2017-10-249588-800-0810ND
2017-10-249588-802-0730ND
2017-10-249588-801-0740ND
2018-01-249588-803-0815ND
2018-01-249588-800-0830ND
2018-01-249588-801-0805ND
2018-01-249588-802-0755ND
2018-04-249588-801-0740ND
2018-04-249588-802-0730ND
2018-04-249588-803-0750ND
2018-04-249588-800-0810ND
2018-07-249588-801-0725ND
2018-07-249588-803-0735ND
2018-07-249588-802-0715ND
2018-07-249588-800-0750ND
2018-10-239588-801-0740ND
2018-10-239588-803-0750ND
2018-10-239588-802-0730ND
2018-10-239588-800-0805ND
2019-01-249588-800-0850ND
2019-01-249588-802-0810ND
2019-01-249588-801-0820ND
2019-01-249588-803-0830ND
2019-04-239588-800-0800ND
2019-04-239588-802-0725ND
2019-04-239588-803-0745ND
2019-04-239588-801-0735ND
2019-07-239588-803-0725ND
2019-07-239588-802-0705ND
2019-07-239588-800-0740ND
2019-07-239588-801-0715ND
2019-10-239588-803-0740ND
2019-10-239588-802-0720ND
2019-10-239588-800-0755ND
2019-10-239588-801-0730ND