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EWG's Tap Water Database — 2021 UPDATE

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Haloacetic acids (HAA5)

Golden State Water Company (GSWC) - South San Gabriel

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)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND160ND
20150.969 ppb167ND - 4.90 ppb
20160.0750 ppb161ND - 1.20 ppb
20170.206 ppb163ND - 1.10 ppb
20182.18 ppb167ND - 8.60 ppb
20190.0813 ppb161ND - 1.30 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 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
2014-01-239588-802-0910ND
2014-01-239588-800-0920ND
2014-01-239588-801-0940ND
2014-01-239588-803-0930ND
2014-04-229588-803-0910ND
2014-04-229588-802-0900ND
2014-04-229588-801-0935ND
2014-04-229588-800-0925ND
2014-07-239588-803-1225ND
2014-07-239588-802-1200ND
2014-07-239588-801-1145ND
2014-07-239588-800-1215ND
2014-10-239588-802-0950ND
2014-10-239588-801-0920ND
2014-10-239588-803-0930ND
2014-10-239588-800-0940ND
2015-01-239588-803-0850ND
2015-01-239588-802-08401.10 ppb
2015-01-239588-801-0915ND
2015-01-239588-800-0900ND
2015-04-229588-803-0845ND
2015-04-229588-802-0905ND
2015-04-229588-800-08551.10 ppb
2015-04-229588-801-0915ND
2015-07-239588-800-09004.90 ppb
2015-07-239588-803-08502.40 ppb
2015-07-239588-802-09102.40 ppb
2015-07-239588-801-09202.30 ppb
2015-10-269588-801-0915ND
2015-10-269588-800-09051.30 ppb
2015-10-269588-803-0855ND
2015-10-269588-802-0845ND
2016-01-269588-801-0930ND
2016-01-269588-800-0920ND
2016-01-269588-803-0910ND
2016-01-269588-802-0900ND
2016-04-229588-801-0920ND
2016-04-229588-800-0900ND
2016-04-229588-803-0850ND
2016-04-229588-802-0910ND
2016-07-269588-803-0845ND
2016-07-269588-801-0925ND
2016-07-269588-800-0855ND
2016-07-269588-802-0910ND
2016-10-269588-803-0915ND
2016-10-269588-801-0945ND
2016-10-269588-802-0935ND
2016-10-269588-800-09251.20 ppb
2017-01-249588-802-0925ND
2017-01-249588-803-0905ND
2017-01-249588-801-0935ND
2017-01-249588-800-09151.10 ppb
2017-04-249588-802-1015ND
2017-04-249588-800-1030ND
2017-04-249588-801-1005ND
2017-04-249588-803-1040ND
2017-07-279588-800-1015ND
2017-07-279588-801-0945ND
2017-07-279588-803-1025ND
2017-07-279588-802-1000ND
2017-10-249588-803-08501.10 ppb
2017-10-249588-800-09001.10 ppb
2017-10-249588-802-0910ND
2017-10-249588-801-0925ND
2018-01-249588-803-0910ND
2018-01-249588-800-09201.20 ppb
2018-01-249588-801-0940ND
2018-01-249588-802-0930ND
2018-04-249588-801-0920ND
2018-04-249588-802-0910ND
2018-04-249588-803-0850ND
2018-04-249588-800-0900ND
2018-07-249588-801-09008.00 ppb
2018-07-249588-803-08308.60 ppb
2018-07-249588-802-08504.50 ppb
2018-07-249588-800-08408.20 ppb
2018-10-239588-801-0910ND
2018-10-239588-803-08452.90 ppb
2018-10-239588-802-0900ND
2018-10-239588-800-08501.40 ppb
2019-01-249588-800-0955ND
2019-01-249588-802-0930ND
2019-01-249588-801-1005ND
2019-01-249588-803-0945ND
2019-04-239588-800-0855ND
2019-04-239588-802-0905ND
2019-04-239588-803-0845ND
2019-04-239588-801-0915ND
2019-07-239588-803-0835ND
2019-07-239588-802-0820ND
2019-07-239588-800-0845ND
2019-07-239588-801-0855ND
2019-10-239588-803-0845ND
2019-10-239588-802-0910ND
2019-10-239588-800-08551.30 ppb
2019-10-239588-801-0925ND